Potential And Kinetic Energy Worksheet (Page 11 of 29) in pdf

Potential And Kinetic Energy Worksheet Page 11

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You pull your sled through the snow a distance of 500 m with a horizontal force of 200 N. How

much work did you do?

8.1

Because the snow suddenly gets too slushy, you decide to carry your 100-N sled the rest of the way

home. How much work do you do when you pick up the sled, lifting it 0.5 m upward? How much work do

you do to carry the sled if your house is 800 m away?

9. An ant sits on the back of a mouse. The mouse carries the ant across the floor for a distance of 10 m. Was

there work done by the mouse? Explain.

10. You decide to add up all the work you did yesterday. If you accomplished 10,000 N · m of work yesterday,

how much work did you do in units of joules?

11. You did 150. J of work lifting a 120.-N backpack.

How high did you lift the backpack?

How much did the backpack weigh in pounds? (Hint: There are 4.448 N in one pound.)

12. A crane does 62,500 J of work to lift a boulder a distance of 25.0 m. How much did the boulder weigh?

(Hint: The weight of an object is considered to be a force in units of newtons.)

13. A bulldozer does 30,000. J of work to push another boulder a distance of 20. m. How much force is applied

to push the boulder?

14. You lift a 45-N bag of mulch 1.2 m and carry it a distance of 10. m to the garden. How much work was

done?

15. A 450.-N gymnast jumps upward a distance of 0.50 m to reach the uneven parallel bars. How much work did

she do before she even began her routine?

16. It took a 500.-N ballerina a force of 250 J to lift herself upward through the air. How high did she jump?

17. A people-moving conveyor-belt moves a 600-N person a distance of 100 m through the airport.

How much work was done?

b. The same 600-N person lifts his 100-N carry-on bag upward a distance of 1 m. They travel another 10 m

by riding on the “people mover.” How much work was done in this situation?

18. Which person did the most work?

John walks 1,000. m to the store. He buys 4.448 N of candy and then carries it to his friend’s house

which is 500. m away.

Sally lifts her 22-N cat a distance of 0.50 m.

Henry carries groceries from a car to his house. Each bag of groceries weighs 40 N. He has 10 bags. He

lifts each bag up 1 m to carry it and then walks 10 m from his car to his house.

Potential And Kinetic Energy Worksheet Page 11