Name: _____________________________________
Date: __________
Work and Power Practice
Work:
1. How much work is done when an 8 N force moves a block 7m?
Given
Equation
Period: ________
Solve
2. Eva applies 40N force to move her bookcase 3m, how much work did Eva do?
Given
Equation
Solve
3. How far will 490 J of work raise a block weighing 7 N?
Given
Equation
Solve
4. Sheila did 110 J of work to move a chair 2 m to the right. How much force did Sheila use to move the chair?
Given
Equation
Solve
5. A rope is thrown over a beam, and one end is tied to a bundle of lumber. You pull the free end of the rope 2 m with
a force of 400 N to lift the lumber off the ground. How much work have you done?
Given
Equation
Solve
6. A deflated hot-air balloon weighs a total of 8000 N. Filled with hot air, the balloon rises to a height of 1000 m.
How much work is accomplished by the hot air?
Given
Equation
Solve
7. Which is more work, pushing with 115 N over 15m or lifting 20N over 10 m? (hint find work for both)
Given
Equation
Solve
Power
8. How much power does it take to do 500 J of work in 10 sec?
Given
Equation
Solve
9. How much work is done if 275 W of power is used in 20 seconds?
Given
Equation
Solve
10. How much power does it take to lift 250 N, 40 m high in 2 seconds?
Given
Equation
Solve
11. If it takes 20 N to move a box, how much power will be needed to move the box a distance of 5 meters in 5
seconds?
Given
Equation
Solve
12. How long much power is used to do 75 N of work in 15 seconds?
Given
Equation
Solve
13. A crane lifts a load of steel that weighs 9500 N a distance of 150 m. It takes 5 minutes to complete the task.
a. How much work is done by the crane?
Given
Equation
Solve
b. How much power does the crane produce?
Given
Equation
Solve