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Final Exam Review
1. What is kinetic energy?
What is the equation for finding kinetic energy?
2. What is potential energy? What is the equation for finding potential energy?
3. What are the units for energy?
4. Work = the change in what?
5. A 10 N force pushes a 40 kg cart 35 m, how much work is done on the cart?
6. A weightlifter lifts 175 kg straight up, how much work is done on the weights?
7. 20 J of work are done on a rabbit wearing ice skates. By how much does the rabbit’s
kinetic energy change?
8. An engine applies a 400 N force to a 700 kg car over a distance of 0.25 km. What is
the change in velocity of the car?
9. How much KE does a 50 kg stork carrying a baby have if it is traveling at 9 m/s?
10. How much potential energy does the stork in Q9 have if it flies at a height of 500 m?
11. Bob and Sue bungee jump from a bridge which is 200 m high. If their combined
mass is 140 kg, and at their lowest point they are at a height of 0 m, graph their kinetic
energy, and their potential energy versus time.
12. A rhinoceros, a wolf, and a goose are water skiing together, pulled by the same boat,
at the same speed. Rank their kinetic energies.
13. A high diver (mess 60 kg) steps off a 10 m board. What is their velocity when they
hit the water?
14. Write two equations for how to find velocity.
15. When two pool balls collide in a game of billiards, what can be said about their
combined momentums before and after they hit?
16. What is angular momentum?
17. If an ostrich is riding a unicycle at 14 m/s, and has a total mass (ostrich + unicycle) of
220 kg, how much momentum does it have?
19. Spongebob Squarepants (mass 20 kg) is floating, stationary, underwater. If he is
holding a 4 kg medicine ball, then throws it backwards at a speed of -5 m/s, what will
Spongebob's velocity be (ignore resistance of the water)?
20. Why are seat belts more important in cars than buses?
21. Two basketballs (mass 0.6 kg) are rolling towards each other. If ball A has initial
velocity 3 m/s to the right, and ball B has initial velocity of 5 m/s to the left. What will
their velocities be after they hit (include direction)?
22. A bowling ball moving to the right at 9 m/s has a mass of 5 kg. If it hits a tennis ball
rolling to the right at 6 m/s, which has a mass of 0.3 kg, and makes the bowling ball end
up with a velocity of 8.6 m/s, what is the final velocity of the tennis ball?
23. A 16 kg wagon is pushed for 4 s by a 100 N force. If it's initial velocity was 2 m/s,
what is its final velocity?
24. Draw a transverse wave and label amplitude and wavelength.
25. Draw a longitudinal wave and label amplitude and wavelength.
26. What determines the wavelength of a wave? What is the equation for the velocity of
a wave?
27. A wave has a frequency of 255 Hz and a wavelength of 2.5 m, what is its velocity?
28. If a wave carries 5 J of energy, how much energy would the same wave carry if it had
twice the amplitude?
29. If you increase the wavelength of a wave, while its speed stays the same, what
happens to its frequency?
30. Explain what happens to the amplitude of two waves when they meet.
31. List the electromagnetic spectrum from highest to lowest frequency.
32. If you mix green and red light, what color will you get?
33. Given that the index of refraction of some plastic is 1.7, what is the speed of light in
that plastic?
34. If light goes from air (index of refraction 1) into the plastic from question 33 and has
an incident angle of 26 degrees, what is its angle of refraction? Include an appropriate
diagram.
35. If it takes light 3 minutes to get somewhere, how far away was the destination?
36. Light hits a window at an angle of 85 degrees, what angle is it reflected at?
37. What is an insulator? What is a conductor?
38. How can you give something an electric charge?
39. A 0.0006 C charge and a 0.00042 C charge are separated by 0.00078 m. What is the
electrical force between the charges? Is it attractive or repulsive? How do you know?
40. If a 100 W light bulb is connected to a 120 V power supply, how much current is
flowing?
41. If a 200 ohm resistor is connected to a 60 V generator, how much current is flowing
in the circuit?
42. What is a series circuit (with resistors)? Draw one that has 3 resistors. If the resistors
have resistances of 200, 300, and 400 ohms respectively, what is the equivalent resistance
of the circuit?
43. What is a parallel circuit? Draw one that has 3 resistors. If the resistors have
resistances of 200, 300, and 400 ohms respectively, what is the equivalent resistance of
the circuit?
44. Name 3 appliances and the energy transformations that take place within them.
45. Magnets have 2 _______________. A ____________ and a _____________.
46. Draw a bar magnet and the magnetic field lines around it.
47. If a wire is carrying current going into the page, goes into the page. Draw the
direction of the magnetic field around the wire.
48. 15 A of current flows through 0.25 m of wire, which is in a magnetic field of 5 T.
What is the force felt by the wire?
49. When a magnet is dropped through a roll of aluminum foil (or copper pipe) why does
the magnet fall slower that when it is dropped next to the foil or pipe?
50. How do you draw an electric field going into the page? Out of the page?
51. Why do boomerangs curve?
52. What shape do all single bubbles take?
53. What are three ways throughout history that people have described the atom?
54. What does LASER stand for?
55. What are three types of radiation?
56. How are fission and fusion different?