Physics Semester Exam 1
Physics. It’s the study of matter, motion and behaviour through space and time, with elements related to energy and force. It’s a vital realm of science as an overall study, and we’ll be looking at it in this quiz.
- 1.
One possible unit of speed is
- A.
Miles per hour.
- B.
Light years per century.
- C.
Kilometers per hour.
- D.
All of the above.
- E.
None of the above
Correct Answer
D. All of the above.Explanation
The correct answer is "all of the above" because each option listed - miles per hour, light years per century, and kilometers per hour - can be used as a unit of speed. Speed can be measured in different units depending on the context and the system of measurement being used. Therefore, all three options are valid units of speed.Rate this question:
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- 2.
Acceleration is defined as the CHANGE in
- A.
Time it takes to move from one place to another place
- B.
Velocity of an object.
- C.
Distance divided by the time interval.
- D.
Velocity divided by the time interval.
- E.
.time it takes to move from one speed to another speed.
Correct Answer
D. Velocity divided by the time interval.Explanation
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 interval. This means that acceleration is equal to the amount by which an object's velocity increases or decreases per unit of time. Therefore, the correct answer is "velocity divided by the time interval."Rate this question:
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- 3.
A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car’s average acceleration?
- A.
0.17 m/s2
- B.
1.67 m/s2
- C.
6 m/s2
- D.
7 m/s2
- E.
None of the above
Correct Answer
C. 6 m/s2Explanation
The car starts from rest and reaches a velocity of 42 m/s in 7 seconds. Average acceleration is calculated by dividing the change in velocity by the time taken. In this case, the change in velocity is 42 m/s (final velocity) - 0 m/s (initial velocity) = 42 m/s. The time taken is 7 seconds. Therefore, the average acceleration is 42 m/s / 7 s = 6 m/s2.Rate this question:
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- 4.
In the absence of air resistance, objects fall at constant
- A.
Speed.
- B.
Velocity.
- C.
Acceleration.
- D.
Distances each successive second.
- E.
All of the above
Correct Answer
C. Acceleration.Explanation
In the absence of air resistance, objects fall at a constant acceleration. This means that the speed at which the object falls increases by the same amount every second. The object's velocity (speed and direction) will also increase, but at a constant rate. The distance the object falls will also increase each successive second, but this is a result of the acceleration. Therefore, the correct answer is acceleration.Rate this question:
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- 5.
Suppose an object is in free fall. Each second the object falls
- A.
The same distance as in the second before.
- B.
A larger distance than in the second before.
- C.
With the same instantaneous speed.
- D.
With the same average speed.
- E.
None of the above
Correct Answer
B. A larger distance than in the second before.Explanation
In free fall, the object falls with an increasing velocity due to the acceleration of gravity. As time progresses, the object gains speed and covers a larger distance in each subsequent second compared to the previous second. Therefore, the correct answer is that the object falls a larger distance than in the second before.Rate this question:
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- 6.
Consider drops of water leaking from a water faucet. As the drops fall they
- A.
Remain at a relatively fixed distance from each other.
- B.
Get farther apart.
- C.
Get closer together.
Correct Answer
B. Get farther apart.Explanation
When drops of water fall from a water faucet, they are subject to gravity. As they fall, the force of gravity causes them to accelerate, resulting in an increase in their distance from each other over time. Therefore, the drops of water get farther apart as they fall.Rate this question:
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- 7.
When a basketball player jumps to make a shot, once the feet are off the floor, the jumper's acceleration
- A.
Varies with body orientation
- B.
Depends on launch speed.
- C.
Is usually greater for taller players (but not always).
- D.
Depends on all the above.
- E.
Is g; no more, no less.
Correct Answer
E. Is g; no more, no less.Explanation
The correct answer is "is g; no more, no less." This means that the jumper's acceleration is equal to the acceleration due to gravity, which is approximately 9.8 m/s^2. Regardless of the player's body orientation, launch speed, or height, their acceleration will always be the same while they are in the air.Rate this question:
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- 8.
Suppose a car is moving in a straight line and steadily increases its speed. It moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is the car's acceleration?
- A.
5 km/h•s
- B.
10 km/h•s
- C.
35 km/h•s
- D.
40 km/h•s
- E.
45 km/h•s
Correct Answer
A. 5 km/h•sExplanation
The car's acceleration can be calculated by finding the change in velocity divided by the time taken. In this case, the change in velocity is 5 km/h and the time taken is 1 second. Therefore, the acceleration is 5 km/h•s.Rate this question:
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- 9.
A ball is thrown straight up. At the top of its path its instantaneous speed is
- A.
0 m/s.
- B.
About 5 m/s.
- C.
About 10 m/s.
- D.
About 20 m/s.
- E.
About 50 m/s.
Correct Answer
A. 0 m/s.Explanation
When a ball is thrown straight up, it reaches its highest point at the top of its path. At this point, the ball momentarily comes to a stop before it starts to fall back down. This means that its velocity is zero at the top of its path. Instantaneous speed is the magnitude of the velocity vector, so the instantaneous speed at the top of the path is also zero.Rate this question:
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- 10.
When something falls to the ground, it accelerates. This acceleration is called the acceleration due to gravity and is symbolized by the letter g. What is the value of g on Earth's surface?
- A.
0 m/s2
- B.
About 5 m/s2
- C.
About 10 m/s2
- D.
About 20 m/s2
- E.
About 50 m/s2
Correct Answer
C. About 10 m/s2Explanation
When something falls to the ground, it accelerates due to the force of gravity pulling it downwards. This acceleration is called the acceleration due to gravity. On Earth's surface, the value of this acceleration is approximately 10 m/s2.Rate this question:
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- 11.
If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by
- A.
About 5 m/s.
- B.
About 10 m/s.
- C.
About 15 m/s.
- D.
A variable amount.
- E.
A rate that depends on its initial speed.
Correct Answer
B. About 10 m/s.Explanation
A freely falling object accelerates due to the force of gravity. The acceleration is approximately 9.8 m/s^2. This means that the object's speed increases by 9.8 m/s every second. Therefore, if the object were equipped with a speedometer, its speed reading would increase by about 10 m/s each second.Rate this question:
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- 12.
A freely falling object starts from rest. After falling for 6 seconds, it will have a speed of about
- A.
6 m/s.
- B.
30 m/s.
- C.
60 m/s.
- D.
300 m/s.
- E.
More than 300 m/s.
Correct Answer
C. 60 m/s.Explanation
When an object is freely falling, it experiences acceleration due to gravity. The acceleration due to gravity is approximately 9.8 m/s^2. Since the object starts from rest, its initial velocity is 0 m/s. Using the equation v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time, we can calculate the final velocity after 6 seconds. Plugging in the values, we get v = 0 + (9.8)(6) = 58.8 m/s. Rounding off, the speed of the object after 6 seconds of falling will be about 60 m/s.Rate this question:
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- 13.
A pencil lies on your desk. If the Earth is moving around the sun at a speed of 30 km/s, how fast is the pencil moving relative to the desk? How fast is the pencil moving relative to the sun?
- A.
0 km/s; 0 km/s
- B.
0 km/s; 30 km/s
- C.
30 km/s; 30 km/s
- D.
There is not enough information to answer these questions.
Correct Answer
B. 0 km/s; 30 km/sExplanation
The pencil is not moving relative to the desk because it is at rest on the desk. Therefore, its speed relative to the desk is 0 km/s. However, the pencil is on the Earth, which is moving around the sun at a speed of 30 km/s. Therefore, the pencil is also moving at the same speed as the Earth relative to the sun, which is 30 km/s.Rate this question:
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- 14.
A 15-N force and a 45-N force act on an object in opposite directions. What is the net force on the object?
- A.
15 N
- B.
30 N
- C.
45 N
- D.
60 N
- E.
None of the above
Correct Answer
B. 30 NExplanation
The net force on an object is the vector sum of all the forces acting on it. In this case, the 15-N force and the 45-N force act in opposite directions. Since they have the same magnitude, the net force is equal to the difference between the two forces, which is 45 N - 15 N = 30 N.Rate this question:
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- 15.
Equilibrium occurs when
- A.
All the forces acting on an object are balanced.
- B.
The sum of the +x forces on an object equals the sum of the –x forces.
- C.
The net force on the object is zero.
- D.
The sum of the upward forces equals the sum of the downward forces.
- E.
All of the above
Correct Answer
E. All of the aboveExplanation
Equilibrium occurs when all the forces acting on an object are balanced, meaning that the sum of the +x forces on an object equals the sum of the –x forces, the net force on the object is zero, and the sum of the upward forces equals the sum of the downward forces. In other words, all of these conditions must be met simultaneously for an object to be in equilibrium.Rate this question:
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- 16.
The weight of a person can be represented by a vector that acts
- A.
In a direction that depends on where the person is standing.
- B.
Perpendicular to the ground underneath the person.
- C.
Parallel to the ground.
- D.
Straight down, even if the person is standing on a hill.
- E.
All of the above
Correct Answer
D. Straight down, even if the person is standing on a hill.Explanation
The weight of a person is always directed straight down, regardless of their position or the slope of the ground. This is because weight is a force that is caused by gravity and acts towards the center of the Earth. Therefore, even if a person is standing on a hill, their weight will still be directed straight down towards the Earth's center.Rate this question:
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Mar 21, 2023Quiz Edited by
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Dec 14, 2010Quiz Created by
123soccer456
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