Work Done (T4)

Question 1

In physics what do we mean when we use the term work?

Answer 1

Work is defined as the energy transferred in a given situation.

Work is done whenever energy changes from one form to another.

Work is measured in joules.

Question 2

Give four examples of work being done..

Answer 2

• a lightbulb works by converting electrical energy into light and heat
• you will do work if you push a car because the car gains kinetic energy and friction will heat up the wheel bearings and tyres once you reach a steady speed
• your car brakes do work when they slow you down because they convert kinetic energy into heat
• lifting a heavy weight off the ground involves work because the weight is gaining gravitational potential energy

Question 3

What is the equation for calculation work done?

Answer 3

W = F x d

W = work done in joules
F = force in Newtons
d = distance moved in metres