Topic 8 - Work_Efficiency_Power

1. In science, ______________ is the transfer of energy received when a force acts over a distance.

• a. efficiency

• b. motion

• c. energy

• d. work

2. What is the equation used to calculate work.

• a. W = mxg

• b. d = W/F

• c. F = w/d

• d. W = Fxd

3. Doing work always means ___________________ energy.

• a. creating

• b. transferring

• c. destroying

• d. all of the above

4. The work output is the work that an object does as a result of work _____________.

• a. efficiency

• b. force

• c. input

• d. distance

5. Work is measured in ____________.

• a. joules

• b. meter

• c. distance

• d. newtons

6. How much work is done by a person who pushes a cart with a force of 100 newtons if the cart moves 20 meters in the direction of the force.

• a. 50 joules

• b. 1000 joules

• c. 2000 joules

• d. 2500 joules

The total energy of workout is always greater than the total energy of work input.

• a. True

• b. False

8. ______________ - the ratio of usable work output divided by total input work.

• a. force

• b. horsepower

• c. efficiency

• d. work

Efficiency is expressed as a _________.

• a. meters

• b. newtons

• c. joules

• d. percent

9. How can efficiency be improved?

• a. increase speed

• b. reduce force

• c. increase friction

• d. reduce friction