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21 Cards in this Set
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 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 
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. 

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

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

Work= 
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) 