Download Name Period ______ Date ______ Energy, Work and Power, and

Name __________________________________
Period ________
Date ____________
Energy, Work and Power, and Simple Machines
Test Preparation
Test Preparation: mrrowesclass.wikispaces.com (Week 6 thru Week 8)
-2nd Semester Word Wall (Energy thru Lever). Words are highlighted in blue.
-Use your science notebooks, homework assignments, handouts, and this worksheet to prepare for the test on
Tuesday 12, 2013.
I.
Energy
a. Potential Energy
b. Kinetic Energy
c. Gravitational Potential Energy
d. Law of Conservation of Energy
II.
Work
a. Know the formula W = Fd
b. Unit of measure: Joules (J)
III.
Power
a. Know the formula P = W / t or P = Fd / t
b. Unit of measure: J / s or 1 Watt
IV.
Simple Machines
a. Identify the six simple machines and their uses.
b. Mechanical Advantage = Output Force / Input Force
KINETIC & POTENTIAL ENERGY PROBLEMS
1. Stored energy or energy due to position is known as ____________________ energy.
2. The formula for calculating potential energy is _______________.
3. The three factors that determine the amount of potential energy in an object are
____________________, ____________________ and ____________________.
4. A machine is something that _________________________.
5. Mass must be measured in units of _______________.
6. The five main forms of energy are _______________, _________________,
________________, __________________, and ___________________.
7. Power can be defined as _________________________.
8. Calculate the potential energy of a rock with a mass of 55 kg while sitting on a cliff that is 27 m high (PE =
mgh).
9. What distance is a book from the floor if the book contains 196 Joules of potential energy and has a mass of 5
kg (W = Fd; Isolate d and solve for distance)?
10. An automobile is sitting on a hill which is 20 m higher than ground level. Find the mass of the automobile if
it contains 362,600 J of potential energy (PE=mgh).
11. Energy of motion is known as ____________________ energy.
12. The formula for calculating kinetic energy is _______________.
13. The two factors that determine the amount of kinetic energy in an object are
____________________ and ____________________.
14. Kinetic energy is measured in units of _______________.
15. Mass must be measured in units of _______________.
16. Work can be defined as ______________.
ENERGY, WORK & POWER
17. Calculate the kinetic energy of the rock in problem #8 if the rock rolls down the hill with a velocity of 8 m/s
(KE = 1/2mv2).
18. Calculate the kinetic energy of a truck that has a mass of 2900 kg and is moving at 55 m/s (Use the formula
KE = 1/2mv2).
19. Find the mass of a car that is traveling at a velocity of 60 m/s North. The car has 5,040,000 J of kinetic
energy (KE = 1/2mv2) (Solve for m).
20. How fast is a ball rolling if it contains 98 J of kinetic energy and has a mass of 4 kg (KE = 1/2mv2) (Solve
for v)?
21. How much power does it take to lift 50N 10m high in 10 sec?
22. Joe applies 250N force to move a bolder 40m, how much work did Joe do?
23. Shelia applies 55 N force to move her chair 2 m, how much work did Shelia do?