Equations

Question 1

Equation for thermal energy(heat)

Answer 1

Energy=mass x specific heat capacity x temperature change

Question 2

Gravitational potential energy

Answer 2

G.P.E=mass x gravitational field strength x height

Question 3

Kinetic Energy

Answer 3

Kinetic energy= 0.5 x mass x (speed)squared

Question 4

Elastic potential energy

Answer 4

Elastic potential energy =0.5 x spring constant x (extension)squared

Question 5

Work done

Answer 5

Work done = force x distance

Question 6

Power

Answer 6

Power = energy transferred/time

Question 7

What is energy measured in?

Answer 7

Joules

Question 8

What is power measured in?

Answer 8

Watts

Question 9

Efficiency

Answer 9

E=Useful power output/Total power input

Question 10

Density

Answer 10

D=Mass/Volume
Mass=grams
Volume=cm cubed

Question 11

What is density measured in?

Answer 11

G/cm cubed

Question 12

What is the equation for specific latent heat?

Answer 12

Energy (for change of state) = specific latent heat x mass

Question 13

What is specific latent heat?

Answer 13

It is the amount of energy needed to change 1kg of a substance from one state to another (with no energy change)

Question 14

What is the specific latent heat of fusion?

Answer 14

The specific latent heat of an object from a solid to a liquid.

Question 15

What is the specific latent heat of vaporisation?

Answer 15

It is the specific latent heat for a liquid to a gas.