Download Potential and Kinetic Energy Problems

Name:
Date:
Period:
Potential and Kinetic Energy Problems:
On a separate sheet of paper, answer the following questions. You must show your
work to get full credit for the answer.
1) What is the gravitational constant on Earth?
2) What is the Potential Energy of a 10 N (pay attention to the unit, Newtons, here)
book that is placed on a shelf that is 2.5 meters high?
3) Determine the amount of potential energy of a 5 N book that is moved to three
different shelves on a bookcase. The height of each shelf is 1.0 meters, 1.5
meters, and 2.0 meters.
4) If you had a book that had a mass of 2.7 kg and it is sitting on a desk that is 2
meters off the ground, what is the potential energy of the book?
5) What is the potential energy of a 3 kg ball that is on the ground
6) Find the mass of an object that has a potential energy of 127 joules and it is on a
cliff that is 28 m high.
7) How far up from the ground was a 35.7 kg object that had a potential energy of
328.3 joules.
8) A 4 kg ball is thrown into the air with an initial velocity of 45 m/s. How much
kinetic energy does the ball have?
9) If the ball in problem #8 comes back down and you catch it….how much
potential energy would the ball have in your hand?
10) Find the amount of kinetic energy of a 34.5 kg elephant that is falling down a cliff
at a velocity of 4.2 m/s.
11) If you threw a .45 kg penny off the Empire State Building at a velocity of 5.67
m/s….what would the kinetic energy of that penny be?
12) If the kinetic energy of an object increases…..what happens to potential energy?
13) Show how you would change the formula for kinetic energy in order to solve for
mass.
14) If the Kinetic Energy of an object is 425J and the mass of the object is 12 kg, what
is the velocity in which the object is traveling?
Name:
Date:
Potential and Kinetic Energy Problems - Key:
1.
9.8 m/s2
2. 25 J
3. 5 J, 7.5 J, 10 J
4. 52.92 J
5. 0
6. 0.46 kg
7. 0.937 m
8. 4050 J
9. 4050 J
10. 304.29 J
11. 7.23 J
12. Decreases
13. m = 2KE/v2
14. 8.416 m/s
Period: