Motion in terms of energy

Question 1

What is the force of a moving object called?

Answer 1

Its Kinetic energy

Question 2

As an object is raised, what kind of energy increases?

Answer 2

Gravitational potential energy

Question 3

How can we calculate work done?

Answer 3

Work done (J) = force (N) * distance moved in the direction of the force (m)

Question 4

What happens when work is done on an object and when work is done by an object?

Answer 4

When work is done on an object, energy is transferred to it.
When work is done by an object, energy is transferred from it.
Amount of energy transferred (J) = work done (J)

Question 5

What is the equation for change in gravitational potential energy?

Answer 5

Change in GPE (J) = weight (N) * vertical height difference (m)

Question 6

What is the equation for kinetic energy?

Answer 6

Kinetic energy (J) = ½ × mass (kg) * velocity^2 ((m/s)^2)

Question 7

What happens to the amount of kinetic energy an object has if frictional forces cannot be ignored?

Answer 7

Frictional forces mean that the amount of kinetic energy an object has is less than the energy transferred to it when work is done by an applied force in a direction, this is because some energy is dissipated through heat

Question 8

Why will the total energy used be equal to the total energy given regardless of whether its wasted as heat through friction?

Answer 8

This is because energy cannot be created or destroyed, laws of conservation.