Download CHS Ch 4 study guide

Ch 4 Energy Study Guide.
Answer on notebook paper.
WORK
1. Explain the definition of work.
ENERGY
2. What is the definition of energy?
3. Briefly explain of the following types of energy: a) mechanical
b)thermal
c) chemical
d) nuclear
e) electrical
f) electromagnetic
4. Give two examples of each type of energy: a) mechanical
b)thermal
c) chemical
d) nuclear
e) electrical
f) electromagnetic
5. What is the Law of Conservation of Energy?
MECHANICAL ENERGY
6. What is Total Mechanical Energy equal to?
7. What is the difference between kinetic energy (KE) and gravitational potential
energy(GPE)?
8. Is it possible to have both gravitational potential energy and kinetic energy at the same
time? Explain.
9. Explain what happens to total mechanical energy as a pendulum swings back and forth.
10. What are the two types of mechanical potential energy? Describe them.
11. What happens to GPE and KE as an object falls?
12. What two factors does the amount of gravitational potential energy depend on?
13. What two factors does the amount of kinetic energy depend on?
14. Imagine someone skating up and down the sides of a frictionless half-pipe with 6m sides:
a. Where will the GPE be the highest?
b. Where is his GPE zero?
c. Where will the KE be the highest?
d. Where will the Total Mechanical Energy be the highest?
e. Where will KE equal the GPE?
f. If you turn the friction on, the skater will eventually slow to a stop. Explain the
energy transformations that occur as he slows down.
g. Two skaters are placed at the same height on two different frictionless half-pipes.
The sides of pipe A are twice as steep as the sides of pipe B. How will the speeds
compare when they reach the center of the half-pipe?
15. A bowling ball, a baseball and a softball are all rolling at the same velocity. Which has
the most KE? Which has the least? Explain why.
16. Describe what happens to the KE and PE of a ball during a fall. Write what is occurring
during the 3 labeled points of the fall.
Starting Point
What’s happening with KE and PE:
What’s happening with KE and PE:
Ground
What’s happening with KE and PE:
CALCULATIONS
17. Fill in the following table with the appropriate units:
Work Force distance GPE KE mass
Units
weight velocity accel.
18. Give the variable formula, substitution with units, and answer with units for the
following:
a. What is the mass of a toy weighing 50N?
b. What is the weight in Newtons of a 6kg box?
c. A 1500 kg car is traveling at a speed of 40m/s, what is the car’s KE? What is its
GPE?
d. A 60kg person is walking at a speed of 3m/s, what is her KE? GPE?
e. A motionless 15 kg block is suspended 20 m above the ground, what is its KE?
Its GPE?
f. A motionless 50 N pot is placed at ground level, what is its KE? GPE?
g. How much work does it take to suspend a 5N block 6m off the floor? If the block
were to drop, what would its KE be the instant before it hits the ground?
h. If 70J of work is done to lift books weighing 5N, how high are they lifted?
i. If lifting a cat 6m high takes 50 Joules of work, how much did the cat weigh?