Motions And Forces-test A
Questions and Answers
- 1.
The direction and speed of a moving object
- A.
Velocity
- B.
Balanced forces
- C.
Force
- D.
Gravitational force
Correct Answer
A. VelocityExplanation
Velocity is the correct answer because it refers to the direction and speed of a moving object. Unlike speed, which only indicates how fast an object is moving, velocity also takes into account the direction in which the object is moving. Therefore, velocity provides a more comprehensive description of the motion of an object.Rate this question:
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- 2.
A push or pull
- A.
Acceleration
- B.
Balanced forces
- C.
Force
- D.
Gravitational force
Correct Answer
C. ForceExplanation
Force is the correct answer because it refers to a push or pull that can cause an object to accelerate or change its motion. Force is a fundamental concept in physics and is measured in units of Newtons. It can be exerted by any object on another object and is responsible for causing changes in velocity or deformation in objects. Forces can be balanced or unbalanced, and they can be caused by a variety of interactions such as gravitational force, electromagnetic force, or contact force.Rate this question:
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- 3.
An object's change in velocity divided by the time it takes for that change to occur
- A.
Acceleration
- B.
Balanced forces
- C.
Force
- D.
Gravitational force
Correct Answer
A. AccelerationExplanation
Acceleration is defined as the change in velocity of an object divided by the time it takes for that change to occur. It represents how quickly an object's velocity is changing. If the velocity of an object is increasing, the acceleration will be positive, while if the velocity is decreasing, the acceleration will be negative. Acceleration is a fundamental concept in physics and is used to describe the motion of objects in various scenarios.Rate this question:
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- 4.
The tendency of matter to resist a change in its state of motion
- A.
Acceleration
- B.
Balanced forces
- C.
Force
- D.
Inertia
Correct Answer
D. InertiaExplanation
Inertia is the tendency of matter to resist a change in its state of motion. It is the property of an object to stay at rest or continue moving at a constant velocity unless acted upon by an external force. Inertia is directly related to an object's mass, with greater mass resulting in greater inertia. This concept is fundamental in understanding the behavior of objects in motion and is a key principle in Newton's laws of motion.Rate this question:
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- 5.
Forces that do not cancel out one another
- A.
Unbalanced forces
- B.
Balanced forces
- C.
Force
- D.
Gravitational force
Correct Answer
A. Unbalanced forcesExplanation
Unbalanced forces refer to forces that are not equal in magnitude and opposite in direction, resulting in a net force. These forces cause an object to accelerate or change its motion. When the forces acting on an object are balanced, they cancel each other out, resulting in no net force. However, in the case of unbalanced forces, there is a residual force that causes a change in the object's motion.Rate this question:
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- 6.
Forces that cancel out one another
- A.
Acceleration
- B.
Balanced forces
- C.
Force
- D.
Gravitational force
Correct Answer
B. Balanced forcesExplanation
Balanced forces refer to forces that are equal in magnitude and opposite in direction, resulting in a net force of zero. When forces cancel each other out, there is no acceleration, meaning that the object remains at rest or continues to move at a constant velocity. This concept is based on Newton's first law of motion, which states that an object will remain in its state of motion unless acted upon by an unbalanced force. Therefore, balanced forces can explain why an object does not accelerate when the forces acting on it are equal and opposite.Rate this question:
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- 7.
A force that acts between any two masses in the universe and pulls them toward each other
- A.
Acceleration
- B.
Balanced force
- C.
Force
- D.
Gravitational force
Correct Answer
D. Gravitational forceExplanation
Gravitational force is a force that exists between any two masses in the universe and pulls them towards each other. It is responsible for the attraction between objects with mass, such as planets, stars, and everyday objects on Earth. This force is always present and acts over any distance, becoming stronger as the masses of the objects increase or as they get closer to each other. The gravitational force is what keeps objects on the surface of the Earth and governs the motion of celestial bodies in the universe.Rate this question:
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- 8.
A measure of the force of gravity on an object
- A.
Weight
- B.
Balanced forces
- C.
Force
- D.
Gravitational force
Correct Answer
A. WeightExplanation
Weight is a measure of the force of gravity on an object. It is the result of the gravitational force exerted by a celestial body, such as Earth, on the object. The weight of an object can change depending on the strength of the gravitational field it is in. For example, an object would weigh less on the moon compared to Earth because the moon has a weaker gravitational pull. Weight is commonly measured in units of force, such as pounds or newtons.Rate this question:
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- 9.
A student walked three miles in one hour. With this information, what can you compute?
- A.
Her direction
- B.
Her force
- C.
Her speed
- D.
Her velocity
Correct Answer
C. Her speedExplanation
Based on the information given, the student walked three miles in one hour. Speed is defined as the distance traveled per unit of time, so we can compute her speed using the formula speed = distance/time. Therefore, we can compute her speed based on the given information.Rate this question:
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- 10.
What prevents the man from moving the box?
- A.
Acceleration
- B.
Air pressure
- C.
Inertia
- D.
Velocity
Correct Answer
C. InertiaExplanation
Inertia is the correct answer because it is the property of matter that resists any change in its state of motion. In this case, the man is unable to move the box because the box has inertia and requires a force to overcome it. The box will remain at rest or continue moving at a constant velocity until an external force is applied to it.Rate this question:
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- 11.
Two girls are helping each other push a cart of books down the hallway. What is the total of their force called?
- A.
Frictional force
- B.
Gravitational force
- C.
Net force
- D.
Universal force
Correct Answer
C. Net forceExplanation
The total force exerted by the two girls on the cart of books is called the net force. This force takes into account the combined effort of both girls and is responsible for the overall motion of the cart. It is the vector sum of all the individual forces acting on the cart, including any external forces such as friction or gravity. The net force determines whether the cart will accelerate, decelerate, or remain at a constant velocity.Rate this question:
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- 12.
Two teams are having a tug of war. Neither team is winning. What kind of force is acting on the rope?
- A.
Balanced force
- B.
Magnetic force
- C.
Unbalanced force
- D.
Vertical force
Correct Answer
A. Balanced forceExplanation
In a tug of war, when neither team is winning, it means that the forces applied by both teams are equal in magnitude and opposite in direction. This results in a balanced force acting on the rope.Rate this question:
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- 13.
Which force pulls statically charged objects?
- A.
Electrical force
- B.
Gravitational force
- C.
Magnetic force
- D.
Nuclear force
Correct Answer
A. Electrical forceExplanation
The electrical force is the correct answer because it is the force that acts between static charged objects. When objects have an imbalance of positive and negative charges, they exert an electrical force on each other, either attracting or repelling depending on the charges. This force is responsible for various phenomena, such as the attraction between protons and electrons in an atom or the repulsion between two positively charged objects.Rate this question:
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- 14.
Forces that cancel one another are
- A.
Balanced forces
- B.
Friction
- C.
Gravitational forces
- D.
Weight
Correct Answer
A. Balanced forcesExplanation
Balanced forces refer to forces that are equal in magnitude and opposite in direction, resulting in a net force of zero. When two or more forces cancel each other out, they are considered balanced forces. This means that there is no overall change in the object's motion, as the forces are in equilibrium.Rate this question:
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- 15.
When you are measuring the force of gravity on your body, you are measuring your
- A.
Weight
- B.
Velocity
- C.
Force
- D.
Acceleration
Correct Answer
A. WeightExplanation
When you are measuring the force of gravity on your body, you are measuring your weight. Weight is the force exerted on an object due to gravity, and it is directly proportional to the mass of the object. It is commonly measured in units of Newtons (N) and is influenced by the mass of the object and the acceleration due to gravity. Therefore, when you measure the force of gravity on your body, you are essentially measuring your weight.Rate this question:
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- 16.
The force that pulls masses together is the
- A.
Gravitational force
- B.
Weight
- C.
Velocity
- D.
Force
Correct Answer
A. Gravitational forceExplanation
The force that pulls masses together is the gravitational force. This force is responsible for the attraction between objects with mass. It is the reason why objects fall towards the Earth and why planets orbit around the Sun. The gravitational force depends on the masses of the objects and the distance between them. It is a fundamental force in nature that plays a crucial role in shaping the structure and behavior of the universe.Rate this question:
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- 17.
The force that prevents or slows motion between objects that are touching is
- A.
Friction
- B.
Gravitational force
- C.
Weight
- D.
Velocity
Correct Answer
A. FrictionExplanation
Friction is the force that opposes or hinders the motion between objects that are in contact with each other. It is caused by the roughness of surfaces and the interlocking of microscopic irregularities. Friction can either prevent or slow down the motion between objects, depending on the direction and magnitude of the force applied. Gravitational force is the force of attraction between two objects due to their mass, weight is the force exerted on an object due to gravity, and velocity is the measure of the speed and direction of an object's motion.Rate this question:
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- 18.
Masses resist changes to their motion because they have
- A.
Inertia
- B.
Balanced forces
- C.
Friction
- D.
Gravitational force
Correct Answer
A. InertiaExplanation
Masses resist changes to their motion because of inertia. Inertia is the tendency of an object to resist any change in its motion. This means that an object at rest will remain at rest, and an object in motion will continue moving in a straight line at a constant speed, unless acted upon by an external force. Inertia is directly related to the mass of an object, with larger masses having greater inertia. Therefore, the correct answer is inertia.Rate this question:
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- 19.
The speed and direction of an object's motion are its
- A.
Velocity
- B.
Force
- C.
Acceleration
- D.
Inertia
Correct Answer
A. VelocityExplanation
Velocity refers to the speed of an object in a specific direction. It is a vector quantity that takes into account both the magnitude (speed) and the direction of motion. Therefore, velocity is the correct answer as it accurately describes the speed and direction of an object's motion.Rate this question:
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- 20.
A push or a pull is a
- A.
Force
- B.
Acceleration
- C.
Inertia
- D.
Balanced forces
Correct Answer
A. ForceExplanation
The correct answer is force. Force is defined as a push or a pull that can cause an object to move, stop, or change its speed or direction. It is a fundamental concept in physics and is measured in units called Newtons. Forces can be applied in various ways and can have different effects on objects, such as causing them to accelerate, decelerate, or remain at rest.Rate this question:
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- 21.
An object's change in velocity divided by the time over which the change occurred is
- A.
Acceleration
- B.
Inertia
- C.
Balanced forces
- D.
Friction
Correct Answer
A. AccelerationExplanation
Acceleration is defined as the rate at which an object's velocity changes over time. It is calculated by dividing the change in velocity by the time taken for the change to occur. Therefore, the given statement accurately describes the concept of acceleration. In contrast, inertia refers to an object's resistance to change in motion, balanced forces refer to forces that cancel each other out resulting in no change in motion, and friction is the force that opposes motion.Rate this question:
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- 22.
Which two factors affect gravitational force?
- A.
Acceleration and masses
- B.
Distance and masses
- C.
Distance and sizes
- D.
Volume and masses
Correct Answer
B. Distance and massesExplanation
Gravitational force is determined by the masses of the objects involved and the distance between them. The greater the mass of an object, the stronger its gravitational force. Similarly, the closer two objects are to each other, the stronger their gravitational force. Therefore, both distance and masses are factors that affect gravitational force. The other options, acceleration, sizes, and volume, are not directly related to gravitational force.Rate this question:
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- 23.
Which surface would probably offer the least friction if you were to slide a box across it?
- A.
Brick
- B.
Carpet
- C.
Ice
- D.
Wood
Correct Answer
C. IceExplanation
Ice would probably offer the least friction if you were to slide a box across it. This is because ice has a smooth and slippery surface, which reduces the amount of friction between the box and the ice. In contrast, brick, carpet, and wood surfaces are rougher and have more texture, resulting in higher levels of friction when objects slide across them.Rate this question:
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- 24.
An object is floating in a container of water. Which force opposes gravity?
- A.
Buoyant force
- B.
Electricity
- C.
Friction
- D.
Surface tension
Correct Answer
A. Buoyant forceExplanation
The buoyant force is the force that opposes gravity when an object is floating in a container of water. This force is exerted by the water on the object and is equal to the weight of the water displaced by the object. It acts in the upward direction, counteracting the downward force of gravity, allowing the object to float. The other options, electricity, friction, and surface tension, are not forces that specifically oppose gravity in this scenario.Rate this question:
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- 25.
Two tug-of-war teams pull with great force on a rope, but there is no motion of the rope. Why not?
- A.
Balanced forces act on the rope.
- B.
Gravity cancels friction on the rope.
- C.
The net force on the rope is not zero.
- D.
Unbalanced forces act on the rope.
Correct Answer
A. Balanced forces act on the rope.Explanation
The correct answer is that balanced forces act on the rope. When two teams pull with equal force in opposite directions, the forces cancel each other out, resulting in a net force of zero. This means that there is no overall force acting on the rope, causing it to remain motionless.Rate this question:
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- 26.
An object is accelerating at a rate of 10 mi/hr per second. After 1 sec, its speed is 10 mi/hr. After 2 sec, its speed is 20 mi/hr. What is its speed after 3 sec?
- A.
10 mi/hr
- B.
20 mi/hr
- C.
30 mi/hr
- D.
100 mi/hr
Correct Answer
C. 30 mi/hrExplanation
The object is accelerating at a constant rate of 10 mi/hr per second. This means that its speed increases by 10 mi/hr every second. After 1 second, its speed is 10 mi/hr. After 2 seconds, its speed increases by another 10 mi/hr, resulting in a speed of 20 mi/hr. Therefore, after 3 seconds, its speed will increase by another 10 mi/hr, resulting in a speed of 30 mi/hr.Rate this question:
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- 27.
Think about the forces acting on the parachutist. The force of air resistance pushes up. Which is the force pulling down?
- A.
Friction
- B.
Gravity
- C.
Magnetism
- D.
Surface tension
Correct Answer
B. GravityExplanation
The force pulling down on the parachutist is gravity. Gravity is the force that attracts objects towards the center of the Earth. In this case, gravity is pulling the parachutist downwards, counteracting the force of air resistance pushing upwards.Rate this question:
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- 28.
Which two factors keep a planet in orbit around the sun?
- A.
Gravity and the planet's inertia
- B.
Gravity and the planet's weight
- C.
Gravity and the planet's size
- D.
Gravity and the sun's inertia
Correct Answer
A. Gravity and the planet's inertiaExplanation
Gravity is the force that attracts objects towards each other, and it is responsible for keeping a planet in orbit around the sun. The planet's inertia, which is its tendency to resist changes in motion, also contributes to keeping it in orbit. As the planet moves in its orbit, its inertia causes it to continue moving forward, while gravity pulls it towards the sun, creating a balance that maintains the planet's orbit. The planet's weight and size are not directly related to keeping it in orbit, making them incorrect choices.Rate this question:
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- 29.
Look at the graph below. It shows how a car's distance changed. At what time was the car's acceleration greatest?
- A.
During the first 5 sec
- B.
During the second 5 sec
- C.
During the third 5 sec
- D.
During the fourth 5 sec
Correct Answer
D. During the fourth 5 secExplanation
The graph shows the distance changing over time. The steeper the slope of the graph, the greater the acceleration. During the fourth 5 seconds, the graph has the steepest slope, indicating the greatest acceleration.Rate this question:
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- 30.
Can two buses travel at the same speed but with different velocities?
- A.
Yes
- B.
No
Correct Answer
A. YesExplanation
Yes, two buses can travel at the same speed but with different velocities. Speed is a scalar quantity that only considers the magnitude of the motion, while velocity is a vector quantity that takes into account both the magnitude and direction of the motion. So, even if two buses are moving at the same speed, they can have different velocities if they are moving in different directions.Rate this question:
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