P 1

Question 1

What is the equation to find kinetic energy?

Answer 1

Kinetic energy= 1/2 x mass x speed(squared)

Question 2

What is energy dissipation?

Answer 2

Energy within a closed system is always conserved. Wasted energy is often thermal energy and ‘dissipates to the surroundings.’

Question 3

What is a major cause of dissipation?

Answer 3

Friction

Question 4

Name the 7 types of energy stores

Answer 4

• kinetic
• Thermal (heat)
• Gravitational Potential
• Elastic potential
• Chemical Potential
• Magnetic
• Nuclear

Question 5

Name the 5 energy transfers

Answer 5

• Electrical
• Light/ radiation
• Heating
• Sound
• Forces/ Mechanically

Question 6

What is thermal energy?

Answer 6

Anything with a temperature above 0°C

Question 7

What is kinetic energy?

Answer 7

Anything that is moving.

Question 8

What is nuclear energy?

Answer 8

Released only from nuclear reactions e.g the sun and all of the stars, hydrogen bomb.

Question 9

What is sound energy?

Answer 9

Anything noisy gives off sound energy.

Question 10

What is light energy?

Answer 10

Anything luminous.

Question 11

What is chemical energy?

Answer 11

Food, fuel and batteries. (Anything with stored energy)

Question 12

What is electrical energy?

Answer 12

energy derived from electric potential energy or kinetic energy.

Question 13

What is gravitational energy?

Answer 13

Anything above the ground has gravitational energy.

Question 14

What is the conservation of energy?

Answer 14

Energy can not be created or destroyed.

Question 15

What is the equation for energy efficiency?

Answer 15

Energy efficiency (%)= 
(useful energy output (divided by) total energy input) x100

Question 16

What is the equation to find gravitational potential energy?

Answer 16

GPE= mass x height x gravity

Question 17

What is work?

Answer 17

Enegy transferred by a force: work done= force x distance moved in the direction of the force.

Question 18

What is power?

Answer 18

Power is the rate of doing work. It is measured in Watts (W). 1 watt means 1 joule of work done per second.

Question 19

What is the equation for velocity?

Answer 19

Velocity= (kinetic energy (divided by) 1/2) x mass

Question 20

What is the equation to work out enrgy transfered?

Answer 20

Energy transfered= Power x Time

Question 21

What is the equation to find weight?

Answer 21

Weight= Mass x Gravity

Question 22

What is the equation to find out work?

Answer 22

Work= Force x Distance

Question 23

Conservation of energy?

Answer 23

Energy cannot be created or destroyed.

Question 24

Dissipated energy/ dissipation of energy?

Answer 24

The energy that is not usefully transferred and stored in less useful ways.

Question 25

Equation of Efficiency?

Answer 25

Useful energy transferred (divided by) total energy supplied to the device.

Question 26

Elastic potential energy?

Answer 26

Energy stored in an elastic object as a result of it being deformed (e.g streched spring).

Question 27

Hookes law?

Answer 27

The extension of a spring is directly proportional to the force applied, as long as it’s limit of proportionally is not exceeded.

Question 28

Input energy?

Answer 28

Energy supplied to a device.

Question 29

Power?

Answer 29

Energy transformed or transferred per second: unit of power- Watt (W)

Question 30

Spring constant?

Answer 30

Force per unit extension of a spring.

Question 31

Useful energy?

Answer 31

Energy transferred to where it is wanted in the way that is wanted.

Question 32

Wasted energy?

Answer 32

Energy that is not usefully transferred.