1. Define kinetic energy (KE) and give the formula for calculating it.
2. Define gravitational potential energy (GPE) and give the formula for calculating it.
3. Briefly explain of the following types of energy and give two examples: a) mechanical b) thermal c) chemical
4. What is the Law of Conservation of Energy?
5. Plants photosynthesis to convert sunlight into what type of energy?
6. What is Total Mechanical Energy equal to?
7. What two factors does the amount of gravitational potential energy depend on? (look at the formula)
8. What two factors does the amount of kinetic energy depend on? (look at the formula)
9. What happens to the GPE of a stack of books when they are placed on a higher shelf?
10. What happens to the KE of a car as its velocity increases?
11. What happens to the KE, GPE and the total mechanical energy of a ball as it rolls down a hill?
12. When you drop a pencil, when its GPE equal to zero?
13. If you add friction, a rolling ball will eventually slow to a stop. Explain what happens with the energy as the ball slows down.
14. A bowling ball, a baseball and a ping pong ball are all rolling at the same velocity. Which has the most KE? Which has the least? Explain why.
CALCULATIONS 15. Fill in the following table with the appropriate metric units: distance GPE KE mass weight velocity Units
accel.
16. Give the variable formula, substitution with units, and answer with units for the following: a. A 1500 kg car is traveling at a speed of 40m/s, what is the car’s KE?
b. A 60kg person is walking at a speed of 3m/s, what is her KE?
c. A motionless 15 kg block is suspended 20 m above the ground, what is its GPE?
d. A motionless 50 N pot is placed on top of a 2.5m shelf, what is its GPE?
e. A 5N clock is dropped off of a building. Calculate the GPE, KE and total mechanical energy of the clock when it is 5m off the ground and traveling 3m/s. (g=10m/s2)
f.
A 3 kg hanging plant is suspended above the ground when the chain breaks and it begins to fall. Calculate its GPE, KE and total mechanical energy when it is 4 m above the ground and traveling at 1.2m/s.
What is Total Mechanical Energy equal to? 7. What two factors does the amount of gravitational potential energy depend on? (look at the formula). 8. What two ...
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