Physics (conservation Of Energy)

Question 1

Kinetic energy-

Answer 1

Anything moving has energy in its kinetic energy store.

Question 2

Thermal energy-

Answer 2

Any object- the hotter it is, the more energy it has in this store.

Question 3

Chemical energy-

Answer 3

Anything that can release energy by a chemical reaction, e.g. food, fuels.

Question 4

Gravitational potential energy-

Answer 4

Anything in a gravitational field (I.e. anything that can fall)

Question 5

Elastic potential energy-

Answer 5

Anything stretched, like springs, rubber band, etc.

Question 6

Electrostatic-

Answer 6

E.g two charges that attract or repel each other

Question 7

Magnetic-

Answer 7

E.g two magnets that attract or repel each other.

Question 8

Nuclear-

Answer 8

Atomic nuclei release energy from this store in nuclear reactions.

Question 9

Conservation of energy-

Answer 9

Energy can be stored, transferred between stores, and dissipated- but it can never be created or destroyed. The total energy of a closed system have no net change.

Question 10

Diddipsted-

Answer 10

Spread out (energy)

Question 11

How to calculate efficiency-

Answer 11

Efficiency = useful energy transferred by device divided by total energy supplied to device.

Question 12

Efficiency-

Answer 12

A way of describing how good a machine is at transferring energy into useful forms.

Question 13

Insulation-

Answer 13

Slows down the rate at which energy is transferred out of a house by heating.

Question 14

Gravitational potential energy (GPE)-

Answer 14

Energy that is stored because of an objects position in a gravitational field.

Question 15

Change in gravitational potential energy=

Answer 15

Mass (kg) x gravitational field strength (N/kg) x change in vertical height (m)

Question 16

Non-renewable energy resources-

Answer 16

They will run out one day. Fossil fuels and nuclear fuels

Question 17

Renewable energy resources-

Answer 17

Like wind, solar, hydro-electricity and tides, won’t run out.