P1 Revision

Question 1

What is the equation for kinetic energy?

Answer 1

Energy(j) = 1/2 x mass x (velocity^2)(m/s)

Question 2

What is the conservation of energy?

Answer 2

Energy can never be created or destroyed, just transferred from one to another.

Question 3

What is the equation for elastic potential energy

Answer 3

Energy(j) = 1/2 x spring constant(n/m) x (extension^2)(m)

Question 4

What is the equation for gravitational potential energy

Answer 4

Energy(j) = mass x gravitational field strength(n/kg) x height(m)

Question 5

Define the specific heat capacity of a substance

Answer 5

The amount of energy needed to raise the temperature of 1kg of a substance by 1 degree Celsius

Question 6

What are the units for specific heat capacity?

Answer 6

Joules, degree Celsius, kilogram

Question 7

Definition of power

Answer 7

The rate of which energy is transferred (or which work is done)

Question 8

State the two equations for power

Answer 8

Power= energy transferred/time
Power = work done/ time

Question 9

What is the unit of power

Answer 9

Watt(w)

Question 10

Give examples of chemical energy stores

Answer 10

Food
Fuel
Batteries

Question 11

4 different stores of energy

Answer 11

Kinetic energy
Gravitational potential energy
Elastic potential
Chemical energy