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21 Cards in this Set

  • Front
  • Back

Name the 5 forms of energy

Chemical, Kinetic, Gravitational Potential, Elastic and Thermal

Name the 4 ways in which energy can be transferred

Heating, Waves, Electric current and work

Name the energy transfers that take place in a torch.

Chemical (battery) > Electric Current (wires) > Energy dissipates (surroundings) > Light waves and Heating

Conservation of energy

Energy can never be created or destroyed only transferred from one form to another.


Work done is done when a force moves an object over a distance in the direction of the force. Work is a measure of the amount of energy transferred.


How much matter an object is made from, measured in kg


Weight is the force objects of mass are pulled toward a planet with. The greater the mass of the two objects the greater the pull and as a result the greater the weight.


Gravity is the attraction of objects with mass toward each other. The gravitational field strength of a planet is the measure of the weight each kg of mass will be pulled toward the planet with.

Gravitational Potential energy

The energy an object has due to its mass, height and gravitational field strength.

Kinetic energy

Kinetic energy is the energy an object with mass has when its moving. The faster it moves or the larger it’s mass the more energy it will have.

Elastic Potential energy

When a rubber band or string is stretched it stores energy. The amount of energy depends on the stiffness aka the spring constant of the spring or band and the extention.

Energy efficiency

Energy efficiency is a measure of the proportion of energy that is transferred usefully. Energy efficiency can not be more than 100%


Power is a measure of the rate of energy transferred from one form to another.


Force (n) x Distance (m)

GPE (j)=

Mass (kg) x Gravitational Field Strength (j) x Height (m)

Kinetic Energy (j)=

1/2 x mass (kg) x velocity ^2 (m/s)

Velocity (m/s) =

_/ (2 x kinetic energy [j] ) / mass (kg)

Elastic Potential Energy (j) =

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

Efficiency (%)=

{Useful energy output (j) / useful energy input (j) } x100

Weight (n) =

Mass (kg) x Gravitational field strength (n/kg)

Power (w)=

Energy transferred (j) / time taken (seconds)