Energy

Question 1

What does kinetic energy describe

Answer 1

describes the energy an object has because it is moving

Question 2

What does Gravitational potential energy describe

Answer 2

Describes the energy stored in an object because of its position

Question 3

What does thermal energy describe

Answer 3

Describes the energy a substance has because of its temperature

Question 4

What energy is transferred during chemical reactions?

Answer 4

Chemical energy stores

Question 5

What is a system

Answer 5

an object or a group of objects

Question 6

What happens to the GPE store of an object when it moves up

Answer 6

The GPE increases

Question 7

What is the Kinetic energy formula

Answer 7

KE = 1/2 x mass x speed^2
E = 1/2 x m x v^2

Question 8

What happens to the kinetic energy store when a falling object hits the ground

Answer 8

The KE decreases

Question 9

As an object falls what happens to its GPE and KE

Answer 9

The GPE transfers into KE

Question 10

Equation for efficiency?

Answer 10

efficiency = useful output energy transfer/ total input energy transfer
efficiency = useful power output/ total power input

Question 11

When a car slows down what happens to its energy

Answer 11

Kinetic energy transfers into thermal energy

the KE decreases the Thermal energy increases

Question 12

Equation for Change of GPE

Answer 12

Joules = mass x gravitational field strength x change of height

Question 13

Describe useful energy

Answer 13

Useful energy is transferred to where it is wanted in the way that it is wanted

Question 14

Describe wasted energy (dissipated)

Answer 14

Wasted energy is the energy that is not usefully transferred

Question 15

Energy can be transferred usefully, stored or dissipated, but can not be what?

Answer 15

Created or destroyed

Question 16

Power equation

Answer 16

power = energy transferred /time 
P = E/T

Question 17

An energy transfer of 1 joule is equal to a power of how many watts

Answer 17

1 watt

Question 18

Define power

Answer 18

Power is the rate at which work is done

Question 19

Define useful power output and total power input

Answer 19

Useful power output = the useful energy per second transferred by it
Total power input = the energy per second supplied to it

Question 20

what is the equation for work done

Answer 20

work done = force (N) x distance (M)

Question 21

what is a control variable

Answer 21

the thing you keep the same in an experiment