Work &Power

Question 1

What is the formula for work done?

Answer 1

Work done = Force × Distance

Question 2

What is the unit of work done?

Answer 2

Joule (J)

Question 3

How much work is done when a force of 10 N moves an object 5 m?

Answer 3

50 J

Question 4

What is the formula for power?

Answer 4

Power = Work done ÷ Time

Question 5

What is the unit of power?

Answer 5

Watt (W)

Question 6

A machine does 2000 J of work in 5 seconds. What is its power?

Answer 6

400 W

Question 7

What factors affect the amount of work done?

Answer 7

The size of the force and the distance moved in the direction of the force.

Question 8

If a person lifts a 100 N weight 2 m high, how much work is done?

Answer 8

200 J

Question 9

How is energy related to work done?

Answer 9

Energy transferred = Work done (if no energy is lost)

Question 10

What is the difference between energy transferred and work done?

Answer 10

They are the same in value (both in joules), but “work done” refers specifically to energy transferred by a force.