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Name ______________________________ Period _____________ Date ____________
PHYSICS
Chapter 5 Practice Test Conceptual Segment
For the situations below, bubble in “A” if positive work is being done by force mentioned.
Bubble in “B” if negative work is being done. Bubble “C” if no work is being done.
1. The force applied by a horse pulling a wagon forward.
2. The drag force of water resisting the motion of a swimmer.
3. A moving sidewalk transporting passengers horizontally at a constant velocity.
4. The buoyant force keeping a small boat afloat.
5. The lift force upward on the wings of an airplane as it descends.
6. For an object to be considered to have work done on it, it must…
A) accelerate.
B) be at rest.
C) move.
D) have no forces acting on it.
7. A car the goes from 0 to 60 mph in 7 seconds uses _________ power than/as an identical car
that goes from 0 to 60 mph in 4 seconds.
A) more
B) less
C) the same amount of
8. Potential energy is referred to as.
A) non-mechanical energy.
B) stored energy.
C) motion energy.
D) heat energy.
9. To have kinetic energy, an object must be
A) accelerating.
B) in constant motion.
C) at rest.
D) moving.
10. The force of friction doing work on an object usually converts its kinetic energy into…
A) potential energy.
B) increased mass.
C) more kinetic energy.
D) thermal energy.
E) none of these.
11. In our bow and arrow labs, we found the work done on the bow by…
A) calculating the area under the F vs. D graph.
B) finding the spring constant of the bow.
C) launching the arrow and working backwards.
D) all of these.
E) none of these.
12. T/F, The units used to measure energy are the same as the units used to measure work.
13. T/F, The slope of a roller coaster’s hill if made steeper will cause it to be going faster at the
bottom (neglect any frictional effects).
14. T/F, The slope of a roller coaster’s hill has nothing to do with its speed at the bottom of the
hill (neglect any frictional effects).
15. T/F, A full roller coaster will have a higher speed than an empty roller coaster at the bottom
of the hill.
16. T/F, The mass of a roller coaster has nothing to do with its speed.
17. Work is a _________ quantity.
A) vector
B) scalar
18. A “weak” spring, like the spring in a mechanical pencil, has a ____________ spring constant.
A) large
B) small
19. T/F, A spring compressed twice its original distance has 2 times the elastic potential energy.
20. T/F, The energy we use on earth was originally created by the sun.
21. T/F, The spring constant “k” has the units of N/m used to describe it.
22. If a car doubles its speed its kinetic energy…
A) doubles.
B) is increased by a factor of 4.
C) is increased by a factor of 8.
D) is decreased to 1/2 its original value.
23. If a car has half as much mass as a truck traveling at the same speed it has…
A) one forth as much kinetic energy as the truck.
B) one half as much kinetic energy as the truck.
C) twice as much kinetic energy as the truck.
D) four times as much kinetic energy as the truck.
For Questions 24 through 32 use the following selections to describe the type of energy the object
possesses. (Choices may be used more than once.)
(A) Gravitational potential energy
(B) Elastic potential energy
(C) Kinetic energy
(D) Both gravitational potential energy and kinetic energy
(E) The object has no mechanical energy according to our definitions.
24. a snowboarder flying through the air
25. A diver about to leap off of a high dive platform.
26. A pendulum at the very bottom of its swing.
27. A skateboarder at the very top of the half-pipe.
28. A sprinter running around a track.
29. A bow and arrow pulled all the way back ready to shoot.
30. A car speeding down a level road.
31. A stretched rubber band.
32. A book bag on the floor, not moving.
33. What are the SI units for energy?
A) Horsepower
B) m/s2
C) Newtons
D) Joules
E) Watts
34. What are the SI units for work?
A) Horsepower
B) m/s2
C) Newtons
D) Joules
E) Watts
35. What are the SI units for power?
A) Horsepower
B) m/s2
C) Newtons
D) Joules
E) Watts
Name ______________________________ Period _____________ Date ____________
PHYSICS
Chapter 5 Test Problem Segment
Short Problems Two points each. Show all work and assign proper units!
36. A box of tools is pulled 8.3 meters across a horizontal floor by a rope with a force of 24
N directed at an angle of 45 degrees above the horizontal. Find the work done by the
force.
37. A cannonball that has a mass of 2.5-kg is fired at a speed of 150 m/s. Find its kinetic
energy.
38. How much work does a weightlifter do in lifting a 133 kg barbell a distance of 40
centimeters?
39. Find the potential energy of 16,000 kg of water stored at the top of an 18 m high water
tower.
Longer Problems
Work/Kinetic Energy Theorem
40. A 180 kg cyclist accelerates from 3.4 m/s to 12.6 m/s. Calculate the net work done by
the cyclist.
Conservation of Energy
41. A skateboarder approaches a ramp at a speed of 7.4 m/s with a kinetic energy of 1,800
Joules.
A) Find the mass of the skateboarder.
B) If the ramp launches the skateboarder straight up in the air, what is the maximum
height off the ground he can achieve?
42. A teacher doing a physics demonstration raises a pendulum a height of 50 centimeters
and releases it from rest. Calculate the speed reached by the pendulum as it passes
through the bottom of its swing?
43. A basketball travels through a hoop 3.0 meters above the floor with a speed of 2.3 m/s. If
the player that shot the ball released it from a height of 2.2 meters above the floor, at
what speed was it shot?
Power
44. In a physics class a 55 kg girl runs up a set of steps 2.8 meters high in a time of 3.4
seconds. Calculate the power she had to generate to do this.