Chapter 3: Linear Motion
- 1.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
- 2.A horse gallops a distance of 10 kilometers in a time of 30 minutes. Its average speed is
- A.
15 km/h
- B.
20 km/h
- C.
30 km/h
- D.
40 km/h
- 3.A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is
- A.
Zero
- B.
10 km/hr
- C.
110 km/hr
- D.
1000 km/hr
- 4.While an object near the Earth's surface is in free fall, its
- A.
Velocity increases
- B.
Acceleration increases
- C.
Mass increases
- D.
Mass decreases
- 5.A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is
- A.
Zero
- B.
Equal to its weight
- C.
Equal to its weight divided by its mass
- D.
Equal to the product of its mass times its weight
- 6.An object at rest near the surface of a distant planet starts to fall freely. If the acceleration there is twice that of the Earth, its speed one second later would be
- A.
10 m/s
- B.
20 m/s
- C.
30 m/s
- D.
40 m/s
- 7.If an object falling freely 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 each second
- C.
Greater than the second before
- D.
Doubled
- 8.If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by about
- A.
5 m/s
- B.
10 m/s
- C.
15 m/s
- D.
A variable amount
- E.
Depends on its initial speed
- 9.If a freely falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s/s, 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
- 10.Twelve seconds after starting from rest, an object falling freely will have a speed of
- A.
10 m/s
- B.
50 m/s
- C.
100 m/s
- D.
More than 100 m/s
- 11.If an object moves with constant acceleration, its velocity must
- A.
Be constant also
- B.
Change by the same amount each second
- C.
Change by varying amounts depending on its speed
- D.
Always decrease
- 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 m/s
- 14.An apple falls from a tree and hits the ground 5 meters below. It hits the ground with a speed of about
- A.
5 m/s
- B.
10 m/s
- C.
15 m/s
- D.
20 m/s
- E.
Not enough information given to estimate
- 15.It takes 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft?
- A.
About 60 m
- B.
About 120 m
- C.
About 180 m
- D.
More than 200 m
- 16.In each second of fall, the distance a freely falling object will fall is
- A.
About 5 m
- B.
About 10 m
- C.
The same, but not 5 m or 10 m
- D.
Increasing
- E.
None of these
- 17.A car accelerates at 2 meters/s/s. Assuming the car starts from rest, how far will it travel in 10 s?
- A.
2 m
- B.
10 m
- C.
40 m
- D.
100 m
- E.
200 m
- 18.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 about
- A.
Half as much
- B.
The same amount
- C.
Twice as much
- D.
Four times as much
- 19.A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always
- A.
In the direction of motion
- B.
Opposite its velocity
- C.
Directed upward
- D.
Directed downward
- 20.While a car travels around a circular track at a constant speed, its
- A.
Acceleration is zero
- B.
Velocity is zero
- C.
Inertia is zero
- D.
None of the above
- 21.If a car accelerates from rest at 2 meters per second per second, its speed 3 seconds later will be about
- A.
2 m/s
- B.
3 m/s
- C.
4 m/s
- D.
6 m/s
- 22.A ball is thrown upwards and returns to the same position. Compared with its original speed after release, its speed when it returns is about
- A.
Half as much
- B.
The same
- C.
Twice as much
- D.
Four times as much
- 23.An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration in meters per second per second is approximately
- A.
0
- B.
5
- C.
8
- D.
24
- 24.At one instant an object in free fall is moving downward at 50 meters per second. One second later its speed should be about
- A.
25 m/s
- B.
50 m/s
- C.
55 m/s
- D.
60 m/s
- E.
100 m/s
- 25.At one instant a heavy object in air is moving upward at 50 meters per second. One second later its speed is approximately
- A.
40 m/s
- B.
50 m/s
- C.
55 m/s
- D.
60 m/s
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