1 Velocity is to speed as displacement is to

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PHYSICS 1 FINAL EXAM (MULTIPLE CHOICE) Jan 2009

1. Velocity is to speed as displacement is to

1) acceleration (2) momentum

2. The diagram below shows a resultant vector, R .

(3) time (4) distance

Which diagram best represents a pair of component vectors, A and B , that would combine to form resultant vector R ?

3 A person is standing on a bathroom scale in an elevator car. If the scale reads a value

greater than the weight of the person at rest, the elevator car could be moving

(1) downward at constant speed

(2) upward at constant speed

(3) downward at increasing speed

(4) upward at increasing speed

4. A 0.2-kilogram red ball is thrown horizontally at a speed of 4 meters per second from a

height of 3 meters. A 0.4-kilogram green ball is thrown horizontally from the same

height at a speed of 8 meters per second. Compared to the time it takes the red ball to

reach the ground, the time it takes the green ball to reach the ground is

(1) one-half as great (3) the same

(2) twice as great (4) four times as great

5. The acceleration due to gravity on the surface of planet X is 19.6 meters per sec 2 . If an

object on the surface of this planet weighs 980. newtons, the mass of the object is

(1) 50.0 kg (3) 490. N

(2) 100. kg (4) 908 N

6. A man is pushing a baby stroller. Compared to the magnitude of the force exerted on the

stroller by the man, the magnitude of the force exerted on the man by the stroller is

(1) zero

(2) smaller, but greater than zero

(3) larger

(4) the same

7. The force required to start an object sliding across a uniform horizontal surface is larger

than the force required to keep the object sliding at a constant velocity. The magnitudes

of the required forces are different in these situations because the force of kinetic friction

(1) is greater than the force of static friction

(2) is less than the force of static friction

(3) increases as the speed of the object relative to the surface increases

(4) decreases as the speed of the object relative to the surface increases

8. A 50.-kilogram student threw a 0.40-kilogram ball with a speed of 20. meters per second.

What was the magnitude of the impulse that the student exerted on the ball?

(1) 8.0 Ns (3) 4000 Ns

(2) 78 Ns (4) 1000 Ns

9. The work done in moving a block across a rough surface and the heat energy gained by

the block can both be measured in

(1) watts (3) newtons

(2) degrees (4) joules

Note that question 10 has only three choices.

10. Two weightlifters, one 1.5 meters tall and one 2.0 meters tall, raise identical 50.-

kilogram masses above their heads. Compared to the work done by the weightlifter who

is 1.5 meters tall, the work done by the weightlifter who is 2.0 meters tall is

(1) less (2) greater (3) the same

11. A 45.0-kilogram boy is riding a 15.0-kilogram bicycle with a speed of 8.00 meters per

second. What is the combined kinetic energy of the boy and the bicycle?

(1) 240. J (3) 1440 J

(2) 480. J (4) 1920 J

12 A 5-newton force causes a spring to stretch 0.2 meter. What is the potential energy stored

in the stretched spring?

(1) 1 J (3) 0.2 J

(2) 0.5 J (4) 0.1 J

13. A 40.-kilogram student runs up a staircase to a floor that is 5.0 meters higher than her

starting point in 7.0 seconds. The student’s power output is

(1) 29 W (3) 1400 W

(2) 280 W (4) 14,000W

14. A ball dropped from rest falls freely until it hits the ground with a speed of 20 meters per

second. The time during which the ball is in free fall is approximately

(1) 1 s

(2) 2 s

(3) 0.5 s

(4) 10 s

15. In a 4.0-kilometer race, a runner completes the first kilometer in 5.9 minutes, the second

kilometer in 6.2 minutes, the third kilometer in 6.3 minutes, and the final kilometer in

6.0 minutes. The average speed of the runner for the race is approximately

(1) 0.16 km/min (3) 12 km/min

(2) 0.33 km/min (4) 24 km/min

16.

A golf ball is hit with an initial velocity of 15 meters per second at an angle of 35

degrees above the horizontal. What is the vertical component of the golf ball’s initial

velocity?

(1) 8.6 m/s (3) 12 m/s

(2) 9.8 m/s (4) 15 m/s

17. In the diagram below, a 60.-kilogram roller-skater exerts a 10.-newton force on a

30.-kilogram roller-skater for 0.20 second.

What is the magnitude of the impulse applied to the 30.kilogram rollerskater?

(1) 50. N•s (3) 6.0 N•s

(2) 2.0 N•s (4) 12 N•s

Note that question 18 has only three choices.

18.

In the diagram below, a 10.-kilogram block is at

rest on a plane inclined at 15° to the horizontal.

As the angle of the incline is increased to 30.°, the mass of the block will

(1) decrease

(2) increase

(3) remain the same

19. If the direction of a moving car changes and its speed remains constant, which quantity

must remain the same?

(1) velocity

(2) momentum

(3) displacement

(4) kinetic energy

20. Two carts are pushed apart by an expanding spring, as shown in the diagram below.

If the average force on the 1-kilogram cart is

1 newton, what is the average force on the

2-kilogram cart?

(1) 1 N

(2) 0.0 N

(3) 0.5 N

(4) 4 N

21. A girl leaves a history classroom and walks 10. meters north to a drinking fountain.

Then she turns and walks 30. meters south to an art classroom. What is the girl’s total

displacement from the history classroom to the art classroom?

(1) 20. m south (3) 40. m south

(2) 20. m north (4) 40. m north

22. One car travels 40. meters due east in 5.0 seconds, and a second car travels 64 meters

due west in 8.0 seconds. During their periods of travel, the cars definitely had the same

(1) average velocity

(2) total displacement

(3) change in momentum

(4) average speed

23. A skater increases her speed uniformly from 2.0 meters per second to 7.0 meters per

second over a distance of 12 meters. The magnitude of her acceleration as she travels this

12 meters is

(1) 1.9 m/s

2

(3) 2.4 m/s

2

(2) 2.2 m/s

2

(4) 3.8 m/s

2

24. A ball thrown vertically upward reaches a maximum height of 30. meters above the

surface of Earth. At its maximum height, the speed of the ball is

(1) 0.0 m/s (3) 9.8 m/s

(2) 3.1 m/s (4) 24 m/s

25. If the sum of all the forces acting on a moving object is zero, the object will

(1) slow down and stop

(2) change the direction of its motion

(3) accelerate uniformly

(4) continue moving with constant velocity

26. A spring scale reads 20. newtons as it pulls a 5.0-kilogram mass across a table. What is

the magnitude of the force exerted by the mass on the spring scale?

(1) 49 N (3) 5.0 N

(2) 20. N (4) 4.0 N

27 How far will a brick starting from rest fall freely in 3.0 seconds?

(1) 15 m (3) 44 m

(4) 88 m (2) 29 m

28. A 1,200-kilogram car traveling at 10. meters per second hits a tree and is brought to rest

in 0.10 second. What is the magnitude of the average force acting on the car to bring it

to rest?

(1) 120 N (3) 12,000 N

(2) 1200 N (4) 120,000 N

29. A 1.2-kilogram block and a 1.8-kilogram block are initially at rest on a frictionless,

horizontal surface. When a compressed spring between the blocks is released, the

1.8-kilogram block moves to the right at 2.0 meters per second, as shown.

What is the speed of the 1.2-kilogram block after the spring is released?

(1) 1.4 m/s (3) 3.0 m/s

(2) 2.0 m/s (4) 3.6 m/s

31.

30.

32. An object weighing 15 newtons is lifted from the ground to a height of 0.22 meter. The increase

in the object’s gravitational potential energy is approximately

(1) 310 J (3) 3.3 J

(2) 32 J (4) 0.34 J

35.

34.

33.

39.

38. Which graph best represents the motion of a

block accelerating uniformly down an

inclined plane?

40.

41. The graph shown represents the relationship

between the work done by a student running up

a flight of stairs and the time of ascent.

What does the slope of this graph represent?

1) impulse 3) speed

2) momentum 4) power

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