Conservation and Dissipation of Energy (Paper 1)

Question 1

Define ‘work done’

Answer 1

The force acting on an object to make that object move.

Question 2

What is ‘work done’ the same as?

Answer 2

Energy transfered.

Question 3

What is the equation linking force, work done, and distance.

Answer 3

W=Fs
Where W is work done, F is force, and s is distance moved. (along the line of action of the force).

Question 4

What is the energy in work done to overcome friction transferred as and where to?

Answer 4

Work done to overcome friction is transferred as energy to the thermal energy stores of the objects that rub together and to the surroundings.

Question 5

Define ‘power’

Answer 5

Power is the rate of transfer of energy.

Question 6

What is an equation to calculate power?

Answer 6

An equation used to calculate power is P=E/t
When P is power, E is energy transferred to the appliance, and t is the time taken for energy to be transferred.