Name:    Physics Common Assessment Practice Problems

Multiple Choice
Identify the choice that best completes the statement or answers the question.

1

A freely falling object starts from rest. After falling for 15 seconds, it will have a speed of about
 a. 15 m/s. b. 750 m/s. c. more than 750 m/s. d. 75 m/s. e. 150 m/s.

2

A 14-N falling object encounters 8 N of air resistance. What is the net force on the object?
 a. 6 N. b. 14 N. c. 8 N. d. 0 N. e. none of the above

3

Suppose a small plane can fly at 200 km/h relative to the surrounding air. Suppose also that there is a 30 km/h tailwind. How fast does the plane's shadow move across the ground?
 a. 200 km/h b. 170 km/h c. 5 km/h d. 230 km/h e. 30 km/h

4

A minivan has a mass of 1500 kg and accelerates at 2 meters per second squared. What is the magnitude of the force acting on the minivan?
 a. 3000 N. b. 2250 N. c. 1500 N. d. 750 N. e. none of the above

5

A girl pulls on a 7-kg wagon with a constant force of 14 N. What is the wagon's acceleration?
 a. 0.5 m/s2 b. 98 m/s2 c. 7 m/s2 d. 2 m/s2 e. 14 m/s2

6

A cyclist travels 15 meters in the first second of travel, 15 meters again during the second second of travel, and 15 meters again during the third second. Its acceleration is
 a. 0 m/s2. b. 30 m/s2. c. 15 m/s2. d. 45 m/s2. e. none of the above

7

How much time will it take for a person to walk the length of the San Clemente Pier (400 yards) at aconstant speed of 4ft/s?
 a. 300 seconds c. 100 seconds b. 400 seconds d. 1600 seconds

8

You drive a car at a contant velocity of 60 miles/hour for 15 minutes.  How far did you go?
 a. 6.0 miles c. 60 miles b. 15 miles d. 750 miles

9

How much force is needed to accelerate a 2.0-kg rock to an acceleration of 4.0 m/s2?
 a. 8.0 N b. 2.0 N c. 0 N d. 0.5 N e. 24.0 N

10

A sportscar accelerates at 3 m/s2. Assuming the sportscar starts from rest, how much time does it need to accelerate to a speed of 24 m/s?
 a. 48 seconds b. 3 seconds c. 8 seconds d. 24 seconds e. none of the above

11

How fast would a rock hit the ground if it took 7 seconds to hit the ground after you dropped it?  Assume no air resistance.
 a. 60 m/s c. 44 m/s b. 70 m/s d. 35 m/s

12

apple weighs 1 N. When held at rest in your hands, the net force on the apple is
 a. 10 N. b. 0.1 N. c. 0 N. d. 1 N. e. none of the above

13

When an object reaches terminal velocity its acceleration is
 a. 9.8 m/s2. b. 4.9 m/s2. c. 0 m/s2.

14

A car travels at a constant speed of 35 m/s for 7 seconds.  How far did it travel?
 a. 85 meters c. 245 meters b. 350 meters d. 5 meters

15

Suppose you take a trip that covers 240 km and takes 6 hours to make. Your average speed is
 a. 40 km/h. b. 240 km/h. c. 20 km/h. d. 480 km/h. e. 1440 km/h.

16

You drop a rock off of a tall building.  It takes 8 seconds to hit the ground.  How tall is the building?
 a. 80 m c. 40 m b. 320 m d. 640 m

17

You drop a rock off of a tall building.  How fast is it traveling after 5.5 seconds?
 a. 5.5 m/s c. 55 m/s b. 110 m/s d. 9.8 m/s

18

If you dropped a rock off the top of a 80m tall building, how long would it take before it hit the ground?
 a. 4 s c. 16 s b. 2 s d. 8 s

19

A tow truck exerts a force of 2000 N on a car, accelerating it at 1 m/s2. What is the mass of the car?
 a. 667 kg b. 8000 kg c. 1000 kg d. 2000 kg e. none of the above

20

A 15-N falling object encounters 15 N of air resistance. The magnitude of the net force on the object is
 a. 0 N. b. 15 N. c. 30 N. d. none of the above

21

A cannon with a barrel velocity of 100 m/s launches a cannonball horizontally from a tower. Neglecting air resistance, how far vertically will the cannonball have fallen after 1 second?
 a. 5 m b. 110 m c. 100 m d. 200 m e. none of the above

22

You pull horizontally on a 50-kg crate with a force of 250 N and the friction force on the crate is 150 N. The acceleration of the crate is
 a. 8 m/s2. b. 2 m/s2. c. 5 m/s2. d. 1 m/s2.

23

You drop a rock off the top of a cliff from a height of 30 meters above the ground.  What is the average speed of the rock if it hits the ground 2 seconds later?
 a. 60 m/s c. 40 m/s b. 10 m/s d. 15 m/s

24

If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting point is about
 a. 10 seconds. b. 1 seconds. c. 2 seconds. d. 20 seconds. e. not enough information to estimate.

25

What is the acceleration of the block below?

 a. 5 m/s2 c. 15 m/s2 b. 2 m/s2 d. 20 m/s2