ennergy

Question 1

kinetic energy equation

Answer 1

KE= o.5mv2

Question 2

Gravitational Potential Energy

Answer 2

GPE=mgh

mass×gravitational field×height

Question 3

Elastic Potential Energy

Answer 3

Ee= o.5×spring constant×e2

Question 4

Work Done equation

Answer 4

Work done= force(N)×distance(m)

Question 5

Power

Answer 5

P= E÷t

Power = energy transferred ÷ time
​
or Work done(W) ÷ time(s)

Question 6

Power equation for electrical circuits

Answer 6

P= IV (for electrical circuits)

I (for electrical circuits)

V= voltage

Question 7

equation for Efficiency

Answer 7

Efficiency= Useful output energy ÷ Total input energy × 100

Question 8

when should you use the equation for power

Power=WorkDone÷Time

Answer 8

Use this when energy is transferred mechanically (e.g. lifting a weight, pushing a box).

“Work done” is just energy transferred by force.

📌 Example:
If you apply 100 N to push a box 5 m in 10 second

Question 9

when should you use the equation for power

Power=EnergyTransferred÷Time

Answer 9

Use this when you’re given energy in joules (J) and time in seconds (s).

Applies to things like:

Electrical appliances (e.g. a kettle uses 2000 J in 10 seconds)

Heating systems

General energy use

Question 10

Specific heat capacity meanining

Answer 10

how much energy is needed to raise the temperature of 1 kg of a substance by 1°C.

Question 11

specific heat capacity equation

Answer 11

energy transferred (J) = mass (kg)×specific heat capacity (J/kg°C)× temperature change (°C)

ΔE= m×c×Δθ