16 Questions
| Total Attempts: 533

Questions and Answers

- 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.
- 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

- B.
30 N

- C.
45 N

- D.
60 N

- E.
None of the above

- 15.
- 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.
- 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