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
- 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.
- 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
- 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
- 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
- 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.
- 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.
- 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
- 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.
- 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
- 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.
- 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.
- 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.
- 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
- 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
- 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
Questions: 10 | Attempts: 42056 | Last updated: Jan 4, 2021
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