# Review Questions: Linear Motion

## Multiple Choice Questions

1. Galileo's use of inclined planes allowed him to effectively

a. Slow down the acceleration of free fall
b. Increase the acceleration beyond that of free fall.
c. Eliminate the acceleration of free fall
d. All of these
e. None of these

2. An airplane that flies at 100 km/h with a 10 km/h tailwind travels at 110 km/h relative to the ground. If it instead flies into a 10 km/h headwind, its ground speed is

a. 90 km/h
b. 100 km/h
c. 110 km/h
d. 120 km/h

3. The two measurements necessary for calculating average speed are

a. Acceleration and time
b. Velocity and time
c. Distance and time
d. Distance and acceleration
e. Velocity and distance

4. The average speed of a horse that gallops a distance of 10 kilometers in a time of 30 minutes is

a. 10 km/h
b. 20 km/h
c. 30 km/h
d. More than 30 km/h

5. What is the acceleration of a car that maintains a constant velocity of 100 km/hr for 10 seconds?

a. 0
b. 10 km/hr/s
c. Both of these
d. None of these

6. As an object freely falls downward, its

a. Velocity increases
b. Acceleration increases
c. Both of these
d. None of these

7. If an object falling freely downward were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 meters per second per second, then its speed reading would increase each second by

a. 10 m/s
b. 20 m/s
c. 30 m/s
d. 40 m/s
e. Depends on its initial speed.

8. If an object falling freely downward were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be:

a. Constant
b. Less and less
c. Grater than the second before.

9. Ten seconds after starting from rest, an object falling freely downward will have a speed of about:

a. 10 m/s
b. 50 m/s
c. 100 m/s
d. More than 100 m/s

10. If an object falls with constant acceleration, the velocity of the object must:

a. Be constant also
b. Continuously change by the same amount each second
c. Continuously change by varying amounts depending on its speed
d. Continuously decrease
e. None of these.

11. A heavy object and a light object are dropped at the same time from rest in a vacuum. The heavier object reaches the ground:

a. Sooner than the lighter object
b. At the same time as the lighter object
c. Later than the lighter object.

12. If a car increases its velocity from zero to 60 km/h in 10 seconds, its acceleration is:

a. 3 km/h s
b. 6 km/h s
c. 10 km/h s
d. 60 km/h s
e. 600 km/h s.

13. If a rocket initially at rest accelerates at a rate of 50 m/s2 for one minute, its speed will be

a. 50 m/s
b. 500 m/s
c. 3000 m/s
d. 3600 mm/s
e. None of these.

14. Drop a rock from a 5-m height and it accelerates at 10 m/s2 and strikes the ground 1 s later. Drop the same rock from a height of 2.5 m and its acceleration of fall is:

b. The same
c. More.

15. While a car travels around a circular track at constant speed its:

a. Acceleration is zero
b. Velocity is zero
c. Both of these
d. None of these.

16. A car accelerates from rest at 2 meters per second per second. What is its speed 3 seconds after the car starts moving?

a. 2 m/s
b. 3 m/s
c. 4 m/s
d. 6 m/s
e. None of these.

17. A ball is thrown upwards and caught when it comes back down. Neglecting air resistance, its speed when caught is:

a. More than the speed it had when thrown upwards.
b. Less than the speed it had when thrown upwards.
c. The same as the speed it had when thrown upwards.

18. An object travels 8 meters in the first second of travel, 8 meters again during the third second. Its acceleration in meters per second is:

a. 0
b. 5
c. 8
d. 10
e. More than 10.

19. At one instant an object in free fall is moving upward at 50 meters per second. One second later its speed is about:

a. 100 m/s
b. 60 m/s
c. 55 m/s
d. 50 m/s
e. 40 m/s.

20. Disregarding air resistance, objects fall with constant:

a. Velocity
b. Speed
c. Acceleration
d. Distances each successive second.

21. A ball is thrown upwards and caught when it comes back down. In the presence of air resistance, the speed with which it is caught is:

a. More than the speed it had when thrown upwards.
b. Less than the speed it had when thrown upwards.
c. The same as the speed it had when thrown upwards.

22. An apple falls from a tree and hits the ground 5 meters below. It hits the ground with a

a. 5 m/s
b. 10 m/s
c. 15 m/s
d. 20 m/s
e. Not enough information given to estimate.

23. It takes 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft?

d. More than 200 m

24. In each second of fall, the distance a free falling object will fall is: