HDE Section 2: Moments

Question 1

Define Kinetic energy

Answer 1

This is the ability of an object to do work due to its motion.

Question 2

Define Gravitational potential energy

Answer 2

This is the potential that an object has due to it being elevated in a gravitational field

Question 3

Define Work done

Answer 3

Where energy is transferred to or from an object.

Question 4

Define Power

Answer 4

The energy transferred per unit time.

Question 5

Define Conservation of energy

Answer 5

Energy can never be created or destroyed. It can only be transferred from one store or location to another.

Question 6

Define Efficiency

Answer 6

The ratio of useful energy transferred to total energy supplied.

Question 7

Define Joule

Answer 7

The standard unit for one Newton metre.

Question 8

What is work done?

Answer 8

Work is done when the pivot of application of a force is moved in the direction of the force. Energy is transferred to an object when work is done to it.Energy is transferred away from an object when it does work. Both work done and energy are measured in joules.