SP3

Question 1

What are the 8 main energy stores?

Answer 1

GEM-T-NECK
(Gravitational potential, Elastic potential, Magnetic,Thermal, Nuclear, Electrostatic,Chemical, Kinetic)

Question 2

What are the 4 energy transfer mechanisms?

Answer 2

Mechanical work
Electrical work
Heating
Radiation (light/sound)

Question 3

What is the efficiency equation?

Answer 3

Efficiency = (useful energy output ÷ total energy input) × 100%

Question 4

A light bulb uses 100J of electrical energy and produces 15J of light. Calculate its efficiency.

Answer 4

(15 ÷ 100) × 100 = 15% efficient

Question 5

How does insulation reduce energy loss?

Answer 5

Traps air (poor conductor) to reduce heat transfer by conduction/convection

Question 6

What is the U-value?

Answer 6

Measure of heat loss rate - lower U-value = better insulator

Question 7

GPE equation:

Answer 7

GPE = mgh
(mass × gravitational field strength × height)

Question 8

A 2kg book is on a 1.5m shelf (g=9.8N/kg). Calculate its GPE

Answer 8

GPE = 2 × 9.8 × 1.5 = 29.4J

Question 9

KE equation:

Answer 9

KE = ½mv²

Question 10

What happens to KE if velocity doubles?

Answer 10

KE quadruples (since v²)

Question 11

Compare renewable vs non-renewable

Answer 11

Renewable: Infinite supply (solar, wind)
Non-renewable: Finite (fossil fuels, nuclear)

Question 12

Main disadvantage of solar power?

Answer 12

Intermittent (doesn’t work at night)