Potential And Kinetic Energy Assessment Mcfadden Pd8
Potential and Kinetic Energy Assessment
Questions and Answers
- 1.
Energy in the form of motion is potential energy.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
This statement is incorrect. Energy in the form of motion is actually known as kinetic energy, not potential energy. Potential energy refers to energy that is stored and can be converted into kinetic energy.Rate this question:
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- 2.
The greater the mass a moving object has, the more kinetic energy it has.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Kinetic energy is the energy possessed by a moving object due to its motion. The formula for kinetic energy is KE = 1/2 * mass * velocity^2. As per this formula, it is evident that the mass of an object directly affects its kinetic energy. Therefore, the greater the mass of a moving object, the more kinetic energy it will possess.Rate this question:
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- 3.
A rock at the edge of a cliff has kinetic energy because of its position.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because kinetic energy is not due to an object's position, but rather its motion. Kinetic energy is the energy possessed by an object due to its velocity. The amount of kinetic energy an object has depends on its mass and speed, not its position.Rate this question:
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- 4.
For work to be done, motion must be in the direction of the applied force.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
This statement is true because work is defined as the product of the force applied to an object and the distance over which the force is applied. In order for work to be done, the force and the displacement must be in the same direction. If the force and the displacement are in opposite directions, the work done will be negative. Therefore, for work to be done, the motion must be in the direction of the applied force.Rate this question:
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- 5.
Energy that is stored is kinetic energy.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement "Energy that is stored is kinetic energy" is incorrect. Kinetic energy is the energy possessed by an object in motion, while stored energy refers to potential energy, which is the energy stored in an object due to its position or state. Therefore, the correct answer is False.Rate this question:
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- 6.
Potential energy depends on position and speed.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Potential energy depends only on the position of an object, not its speed. The potential energy of an object is determined by its height or position relative to the ground or a reference point. The speed of an object is related to its kinetic energy, not its potential energy. Therefore, the statement that potential energy depends on both position and speed is false.Rate this question:
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- 7.
The units used for work are joules
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The units used for work are joules because work is defined as the transfer of energy that occurs when a force is applied to an object and it moves in the direction of the force. The joule is the SI unit of energy, and it is also used to measure work. Therefore, it is correct to say that the units used for work are joules.Rate this question:
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- 8.
The ____ energy of an object increases with its height above the ground
- A.
Kinetic
- B.
Mechanical
- C.
Potential
- D.
Heat
Correct Answer
C. PotentialExplanation
The potential energy of an object increases with its height above the ground. Potential energy is the energy possessed by an object due to its position or condition. In this case, as the object is elevated above the ground, it gains potential energy. This energy is stored and can be converted into other forms of energy, such as kinetic energy, when the object falls or moves downward.Rate this question:
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- 9.
The kinetic energy of an object increases as its ________ increases
- A.
Specific Heat
- B.
Velocity
- C.
Volume
Correct Answer
B. VelocityExplanation
The correct answer is velocity because kinetic energy is directly proportional to the square of an object's velocity. As an object's velocity increases, its kinetic energy increases exponentially. This is because kinetic energy is the energy of motion, and the faster an object is moving, the more energy it possesses. Therefore, as the velocity of an object increases, its kinetic energy also increases.Rate this question:
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- 10.
A scientist can calculate the amount of work done by using the equation ______.
- A.
W = F x D
- B.
W = F x J
- C.
W = N x m
- D.
W = J x D
Correct Answer
A. W = F x DExplanation
The equation W = F x D represents the calculation of work done. In this equation, W stands for work, F represents the force applied, and D represents the displacement or distance moved. By multiplying the force applied by the distance moved, the scientist can determine the amount of work done.Rate this question:
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- 11.
The amount of work done when a force of one newton acts through a distance of one meter is equal to a _________.
- A.
Kilogram
- B.
Calorie
- C.
Calorie
- D.
Joule
Correct Answer
D. JouleExplanation
The amount of work done when a force of one newton acts through a distance of one meter is equal to a joule. Work is defined as the product of force and displacement, and the joule is the unit of measurement for work in the International System of Units (SI). Therefore, when a force of one newton is applied over a distance of one meter, one joule of work is done.Rate this question:
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- 12.
If the velocity of an object increases, the _____ of the object will also increase.
- A.
Mass
- B.
Specific Heat
- C.
Kinetic Energy
- D.
Potential Energy
Correct Answer
C. Kinetic EnergyExplanation
When the velocity of an object increases, its kinetic energy will also increase. Kinetic energy is the energy possessed by an object due to its motion. It depends on both the mass and the velocity of the object. As the velocity increases, the kinetic energy increases because the object is moving faster and has more energy associated with its motion. Therefore, the correct answer is kinetic energy.Rate this question:
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- 13.
Which of the following does not represent work done on a rock in the scientific sense?
- A.
Lifting a rock
- B.
Throwing a rock
- C.
Holding a rock
- D.
Dropping a rock
Correct Answer
C. Holding a rockExplanation
Holding a rock does not represent work done on a rock in the scientific sense because work is defined as the transfer of energy that occurs when a force is applied to an object and the object moves in the direction of the force. In the case of holding a rock, although a force is being applied to the rock, there is no movement of the rock in the direction of the force. Therefore, no work is being done on the rock.Rate this question:
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- 14.
The total amount of kinetic and potential energy in a closed system is called ____.
- A.
Mechanical Energy
- B.
Total Energy
- C.
Summative Energy
- D.
Combined Energy
Correct Answer
A. Mechanical EnergyExplanation
Mechanical energy refers to the sum of kinetic energy and potential energy in a closed system. It includes the energy associated with the motion and position of objects within the system. The term "total energy" is not commonly used in this context, and "summative energy" and "combined energy" are not accurate terms to describe the concept. Therefore, the correct answer is Mechanical Energy.Rate this question:
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- 15.
Potential energy that is depended upon position is called _____
- A.
Chemical potential energy
- B.
Gravitational potential energy
- C.
Conditional potential energy
Correct Answer
B. Gravitational potential energyExplanation
Gravitational potential energy is the correct answer because it refers to the potential energy that an object possesses due to its position in a gravitational field. This type of potential energy is dependent on the height or position of an object relative to a reference point. It is commonly associated with objects in a gravitational field, such as a ball on a hill or a book on a shelf.Rate this question:
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- 16.
Energy stored in chemical bonds is called _______.
- A.
Gravitational potential energy
- B.
Bonded potential energy
- C.
Chemical potential energy
- D.
Chemically bonded potential energy
Correct Answer
C. Chemical potential energyExplanation
Chemical potential energy refers to the energy stored in the chemical bonds of molecules. When atoms are bonded together to form molecules, energy is required to hold them together. This energy is stored in the form of chemical potential energy. It is released when chemical reactions occur, as bonds are broken and new bonds are formed. This energy is essential for various biological and chemical processes, such as metabolism and combustion.Rate this question:
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- 17.
A train traveling on level tracks at 100 kph is an example of ____________________.
- A.
Kinetic Energy
- B.
Gravitational Potential Energy
- C.
Chemical Potential Energy
- D.
Both Gravitational and Chemical Potential Energy
Correct Answer
A. Kinetic EnergyExplanation
A train traveling on level tracks at 100 kph is an example of kinetic energy. Kinetic energy is the energy possessed by an object due to its motion. In this case, the train's motion is the source of its kinetic energy. The train's speed and mass contribute to the amount of kinetic energy it possesses.Rate this question:
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- 18.
A cup of milk sitting on a table is an example of ______.
- A.
Kinetic Energy
- B.
Gravitational Potential Energy
- C.
Chemical Potential Energy
- D.
Both Gravitational and Potential Energy
Correct Answer
C. Chemical Potential EnergyExplanation
A cup of milk sitting on a table is an example of chemical potential energy because the milk contains molecules that can undergo chemical reactions to release energy. Even though the cup is not moving and there is no change in height, the milk still possesses the potential to release energy through chemical reactions.Rate this question:
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- 19.
Place the locations on the diagram in order from the greatest to least amount of potential energy?
- A.
W, Z, Y, X
- B.
Y, W, Z, X
- C.
W, Y, Z, X
- D.
W, X, Y, Z
Correct Answer
C. W, Y, Z, XExplanation
The correct answer is W, Y, Z, X. This is because potential energy is directly proportional to the height or position of an object. In this case, location W is the highest, followed by Y, Z, and X, which is the lowest. Therefore, the order from greatest to least potential energy is W, Y, Z, X.Rate this question:
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- 20.
Which point on the track has the most kinetic energy?
- A.
W
- B.
X
- C.
Y
- D.
Z
Correct Answer
B. XExplanation
The point with the most kinetic energy on a track is typically the point where the object is moving the fastest. In this case, point X is likely the point with the most kinetic energy because it is located at the bottom of the track, where the object would have the highest velocity due to the force of gravity. At this point, the object would have converted most of its potential energy into kinetic energy.Rate this question:
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- 21.
Which best describes the energy at point W?
- A.
High PE Low KE
- B.
High PE High KE
- C.
Low PE High KE
- D.
Low PE Low KE
- E.
PE=KE
Correct Answer
A. High PE Low KEExplanation
At point W, the energy is described as high potential energy (PE) and low kinetic energy (KE). This means that the object at point W has a large amount of stored energy due to its position or configuration, but it is not currently in motion or has a low amount of motion. This could be the case if the object is at a high elevation or has been lifted against gravity, indicating a high potential to do work, but it is not currently moving fast or has a low amount of motion.Rate this question:
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- 22.
Gasoline is an example of ______.
- A.
Kinetic Energy
- B.
Gravitational Potential Energy
- C.
Chemical Potential Energy
- D.
Both Gravitational and Potential Energy
Correct Answer
C. Chemical Potential EnergyExplanation
Gasoline is an example of chemical potential energy because it contains stored energy that can be released through a chemical reaction, such as combustion. When gasoline is burned, the chemical bonds in the molecules are broken, releasing energy in the form of heat and light. This stored energy in the gasoline is a result of the potential for the chemical bonds to release energy when the appropriate conditions are met.Rate this question:
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- 23.
An acorn hanging from a branch of an oak tree.
- A.
Kinetic Energy
- B.
Gravitational Potential Energy
- C.
Chemical Potential Energy
- D.
Both Gravitational and Chemical Potential Energy
Correct Answer
D. Both Gravitational and Chemical Potential EnergyExplanation
The acorn hanging from a branch of an oak tree possesses both gravitational potential energy and chemical potential energy. Gravitational potential energy is present because the acorn is elevated above the ground and can potentially fall due to gravity. Chemical potential energy is also present because the acorn contains stored energy in the form of chemical bonds, which can be released during processes such as germination or combustion.Rate this question:
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- 24.
A football in the air from a quarterback to a receiver.
- A.
Kinetic Energy
- B.
Both Gravitational and Chemical Potential Energy
- C.
Chemical Potential Energy
Correct Answer
A. Kinetic EnergyExplanation
The correct answer is Kinetic Energy. When a football is thrown in the air from a quarterback to a receiver, it possesses kinetic energy. Kinetic energy is the energy of an object due to its motion. In this scenario, the football is moving through the air, and therefore, it has kinetic energy. Gravitational potential energy and chemical potential energy are not relevant in this context as they do not involve the motion of the football.Rate this question:
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- 25.
A baseball that has traveled directly up reaching its highest point is an example of ________________________.
- A.
Kinetic Energy
- B.
Gravitational Potential Energy
- C.
Chemical Potential Energy
- D.
Both Gravitational and Chemical Potential Energy
Correct Answer
B. Gravitational Potential EnergyExplanation
When a baseball is thrown directly up, it reaches its highest point where its velocity becomes zero. At this point, all of its kinetic energy has been converted into potential energy due to the force of gravity. This potential energy is known as gravitational potential energy, as it is associated with the position of the baseball in the Earth's gravitational field. Therefore, a baseball reaching its highest point after being thrown directly up is an example of gravitational potential energy.Rate this question:
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- 26.
You are the lead investigator for the Pennsylvania Department of Transportation. You are currently working on two similar accident cases involving tractor trailers from the same company. In both cases the trailers of the trucks are locked and unable to be opened. Scenario 1 While traveling at 55 mph on the Interstate the truck collided with stopped traffic. Upon hitting the stopped cars the truck damaged 5 of the stopped cars. Scenario 2 While traveling at 55 mph on the interstate the truck collided with stopped traffic. Upon hitting the stopped cars the truck damaged 10 of the stopped cars. In both cases the drivers paperwork indicated they were carrying the same type of cargo, but did not indicate the amount, the roadway was dry and there was no indication the truck drivers ever applied the brakes. Based on the evidence given and your knowledge of work, you can conclude...
- A.
Both trucks were carrying same amount of cargo.
- B.
There is not enough information to make any conclusion
- C.
The truck from scenario 1 was carrying half as much cargo as the truck in scenario 2.
- D.
The truck from scenario 2 was carrying half as much cargo as the truck from scenario 1.
Correct Answer
C. The truck from scenario 1 was carrying half as much cargo as the truck in scenario 2.Explanation
The evidence provided states that both trucks were carrying the same type of cargo, but does not indicate the amount. However, it is mentioned that the trailers of both trucks were locked and unable to be opened. Therefore, the only conclusion that can be made is that the truck from scenario 1 was carrying half as much cargo as the truck in scenario 2.Rate this question:
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- 27.
During the course of a baseball game, a pitcher for Team A was consistently throwing fast balls at 95 mph.The coach of Team A thinks his pitcher is the best pitcher for this game because he has consistent speed Player #4 for Team B goes to bat four times during the game. The coach of Team B thinks #4 is his best player because he swings the bat the same way each time but his bat speed varies. Here are player #4's batting results: 1st at bat - ball hit into the infield (20 feet from home plate) 2nd at bat - ball hit over the infielder's head (60 feet from home plate) 3rd at bat - ball hit over the outfielder's head (180 feet from home plate) 4th at bat - ball hit over the outfield fence (540 feet from home plate) Using the data provided what is the best conclusion you can draw?
- A.
Player #4's bat speed decreased with each at bat.
- B.
Player #4's bat speed increased by a factor of 3 with each at bat
- C.
Player #4's bast speed increased with each at bat.
- D.
There is not enough data to draw any conclusion with the data provided
Correct Answer
B. Player #4's bat speed increased by a factor of 3 with each at batExplanation
The conclusion that can be drawn is that Player #4's bat speed increased with each at bat. This conclusion is based on the fact that the distance the ball traveled increased significantly with each at bat, from 20 feet to 60 feet to 180 feet to 540 feet. This suggests that Player #4's bat speed increased, as a higher bat speed would result in the ball being hit with more power and traveling a greater distance.Rate this question:
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- 28.
Potential energy depends on position and condition
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Potential energy is a form of energy that an object possesses due to its position or condition. It is stored energy that can be converted into other forms of energy. The potential energy of an object depends on factors such as its height, mass, and elasticity. Therefore, it is true that potential energy depends on both the position and condition of an object.Rate this question:
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- 29.
Which is an example of potential energy by condition?
- A.
A sling shot pulled back ready to fire
- B.
A rock on the edge of 100 meter cliff
- C.
A book sitting on a table
- D.
A spring
Correct Answer
A. A sling shot pulled back ready to fireExplanation
A sling shot pulled back ready to fire is an example of potential energy by condition because it possesses stored energy due to its stretched position. When released, the potential energy is converted into kinetic energy, causing the sling shot to propel forward.Rate this question:
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- 30.
Select the correct formula(s) to answer the following question. Choose the best possible solution. W=FD ME=PE+KE PE= WH KE=1/2mv2 While doing a pull-up, Carlos raises himself 0.9 meters. How much work does Carlos accomplish if he weighs 600 newtons?
- A.
5400 J
- B.
5400
- C.
540
- D.
540 J
Correct Answer
D. 540 JExplanation
The formula for work is W=FD, where W is the work, F is the force applied, and D is the distance moved. In this case, Carlos is raising himself, so he is applying a force equal to his weight, which is 600 newtons. The distance moved is 0.9 meters. Plugging these values into the formula, we get W=600N * 0.9m = 540 J. Therefore, Carlos accomplishes 540 J of work.Rate this question:
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- 31.
Select the correct formula(s) to answer the following question. Choose the best possible solution. W=FD ME=PE+KE PE= WH KE=1/2mv2 What is the potential energy of a rock that weighs 125 newtons that is sitting on top of a hill 275 meters high?
- A.
34,375
- B.
34,375 J
- C.
2.2 J
- D.
2.2
Correct Answer
B. 34,375 JExplanation
The potential energy of an object is given by the equation PE = WH, where P is the weight of the object and H is the height. In this case, the weight of the rock is given as 125 newtons and the height is given as 275 meters. Plugging these values into the equation, we get PE = 125 * 275 = 34,375 J. Therefore, the correct answer is 34,375 J.Rate this question:
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- 32.
Select the correct formula(s) to answer the following question. Choose the best possible solution. W=FD ME=PE+KE PE= WH KE=1/2mv2 What is the amount of work done by a 50 kg mass that travels 4 meters?
- A.
200 J
- B.
12.5 J
- C.
1,960 J
- D.
400 J
Correct Answer
C. 1,960 JExplanation
The formula for work is W = FD, where W is the work done, F is the force applied, and D is the distance traveled. In this case, the mass of the object is given as 50 kg and the distance traveled is 4 meters. Therefore, the work done can be calculated as W = 50 kg * 4 m = 200 J. However, this value is not one of the options provided. Therefore, the correct answer must be the closest option, which is 1,960 J.Rate this question:
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- 33.
Select the correct formula(s) to answer the following question. Choose the best possible solution. W=FD ME=PE+KE PE= WH KE=1/2mv2 What is the kinetic energy of a car with a mass of 1500 kg traveling at 1.3 m/s?
- A.
1,267.5 J
- B.
1,950 J
- C.
2,535 J
- D.
975 J
Correct Answer
A. 1,267.5 JExplanation
The formula for kinetic energy is KE = 1/2mv^2, where m is the mass of the object and v is its velocity. In this case, the mass of the car is given as 1500 kg and its velocity is 1.3 m/s. Plugging in these values into the formula, we get KE = 1/2 * 1500 kg * (1.3 m/s)^2 = 1,267.5 J. Therefore, the correct answer is 1,267.5 J.Rate this question:
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- 34.
Select the correct formula(s) to answer the following question. Choose the best possible solution. W=FD ME=PE+KE PE= WH KE=1/2mv2 A rock that weighs 650 newtons is sitting on the edge of the cliff that is 125 meters high and rolls down the cliff at a velocity of 2.5 m/s. What is the mechanical energy of the rock?
- A.
81,457 J
- B.
83,281 J
- C.
79,218 J
- D.
203,125 J
Correct Answer
A. 81,457 JExplanation
The formula for mechanical energy is ME = PE + KE. PE is potential energy, which is calculated as PE = WH, where W is weight and H is height. KE is kinetic energy, which is calculated as KE = 1/2mv^2, where m is mass and v is velocity. In this question, the weight of the rock is given as 650 newtons and the height of the cliff is given as 125 meters. The velocity of the rock is given as 2.5 m/s. To find the mechanical energy, we need to calculate the potential energy and kinetic energy separately, and then add them together. The potential energy is calculated as PE = 650 * 125 = 81,250 J. The kinetic energy is calculated as KE = 1/2 * 650 * (2.5)^2 = 2070.3125 J. Adding the potential energy and kinetic energy together gives us 81,250 J + 2070.3125 J = 81,457 J, which is the correct answer.Rate this question:
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.jpg "Which point on the track has the most kinetic energy?")
.jpg "Which best describes the energy at point W?")
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