Work Done

Question 1

When is work done

Answer 1

When energy is transferred from one store to another

Question 2

What does mechanical work require

Answer 2

Using a force to move an object

Question 3

What does electrical work require

Answer 3

A current transferring energy

Question 4

What is the formula for work done

Answer 4

Work done (J) = Force (N) x Distance (M)

Question 5

A car is travelling at 20 metres per second, the driver applies the brake and the car stops. What happens when the car stops

Answer 5

The brake presses against the wheel of the car, this creates friction between the brake and the wheel, this friction causes thermal energy to be produced and dissipated as the car comes to a stop

Question 6

A force of 2000N is applied to the brakes of a car. The car takes 20m to come to a stop. Calculate the work done

Answer 6

40,000J
(2000x20=40,000)