Energy 2

Question 1

8 Energy Stores

Answer 1

Kinetic
Thermal
Chemical
Elastic
Gravitational
Nuclear
Electrostatic
Magnetic

Question 2

4 Pathways

Answer 2

Mechanical
Electrical
Heating
Waves/radiation

Question 3

Law of Conservation

Answer 3

Energy cannot be created or destroyed, only transferred. It is conserved in a closed system and transferred from one store to another

Question 4

Wasted energy

Answer 4

In any system, some energy will be wasted or dissipated, this makes the system less efficient

Question 5

Efficiency equation

Answer 5

Useful energy/power output / total energy/power input

Question 6

Efficiency example - oiling a gate

Answer 6

Reduce the amount of friction i.e heat energy lost to surrounding; reduce wasted sound energy

Question 7

Power equation (W)

Answer 7

Work done or energy transferred (J) / time taken (s)

Question 8

Calculating work done (J)

Answer 8

force (N) x distance moved in direction of the force (m)

Question 9

Gravitational pot energy (J)

Answer 9

mass (kg) x grav field strength (9.8n/kg) x height (m)

Question 10

Spring constant equation

Answer 10

force (n) = k (constant) x e (m)

Question 11

elastic potential energy

Answer 11

1/2ke²

Question 12

kinetic energy

Answer 12

1/2m(kg)v(m/s)²

Question 13

weight equation

Answer 13

mass x grav field strength