9.3 Energy

Question 1

What are the energy transfers?

Answer 1

Chemical, kinetic, gravitational, elastic, thermal, magnetic, Electro static, nuclear

Question 2

How can chemical stores be changed?

Answer 2

Chemical reaction

Question 3

How can kinetic stores be changed?

Answer 3

Change the speed

Question 4

How can gravitational stores be changed?

Answer 4

Change the height

Question 5

How can elastic stores be changed?

Answer 5

Stretch or compress

Question 6

How can thermal stores be changed?

Answer 6

Change the temperature

Question 7

How can magnetic stores be changed?

Answer 7

Distance between magnets

Question 8

How can electrostatic stores be changed?

Answer 8

Distance between charges

Question 9

What is energy measured in ?

Answer 9

Joules

Question 10

Conservation of energy meaning

Answer 10

The total amount of Energy cannot change

Question 11

Common wasted energy

Answer 11

Thermal store, sound radiation

Question 12

Equation for calculation efficiency

Answer 12

Efficiency= useful energy transferred / total energy transferred (J) x 100

Question 13

Work done?

Answer 13

Work done = force x distance moved

Question 14

Gravitational potential energy

Answer 14

mass x gravitational field strength x height

Question 15

Kinetic energy?

Answer 15

1/2 x mass x speed squared

Question 16

Sanjay diagrams

Answer 16

The width of the arrow represents how much energy is being transferred electrically

Question 17

How does conservation of energy produce a link between gravitational potential energy, kinetic energy and work done?

Answer 17

If done is done to raise an object GP is increased in KE is decreased if work is done to lower an object GP is decreased and KE is increased