Work done

Question 1

When is work done?

Answer 1

• Work is done when an object is moved over a distance by a force that is applied in the direction of its displacement
• If force is applied but the object doesn’t move then no work was done

Question 2

Equation for work done

Answer 2

• Work done (Nm) = force (N) X distance (m)

Question 3

How is energy transferred and work done related?

Answer 3

• When any work is done, energy is transferred from one store to another
• Energy transferred (J) = work done (Nm)
• 1J = 1Nm

Question 4

How does friction effect work done?

Answer 4

• Friction works in opposition to the motion of the object
• When friction is present, energy is lost to the surrounding via heat
• Air resistance is a type of friction