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21 Cards in this Set
- Front
- Back
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Name the 5 forms of energy |
Chemical, Kinetic, Gravitational Potential, Elastic and Thermal |
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Name the 4 ways in which energy can be transferred |
Heating, Waves, Electric current and work |
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Name the energy transfers that take place in a torch. |
Chemical (battery) > Electric Current (wires) > Energy dissipates (surroundings) > Light waves and Heating |
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Conservation of energy |
Energy can never be created or destroyed only transferred from one form to another. |
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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. |
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Mass |
How much matter an object is made from, measured in kg |
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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. |
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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. |
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Gravitational Potential energy |
The energy an object has due to its mass, height and gravitational field strength. |
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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. |
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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. |
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Energy efficiency |
Energy efficiency is a measure of the proportion of energy that is transferred usefully. Energy efficiency can not be more than 100% |
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Power |
Power is a measure of the rate of energy transferred from one form to another. |
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Work= |
Force (n) x Distance (m) |
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GPE (j)= |
Mass (kg) x Gravitational Field Strength (j) x Height (m) |
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Kinetic Energy (j)= |
1/2 x mass (kg) x velocity ^2 (m/s) |
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Velocity (m/s) = |
_/ (2 x kinetic energy [j] ) / mass (kg) |
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Elastic Potential Energy (j) = |
1/2 x spring constant (n/m) x extension^2 (m) |
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Efficiency (%)= |
{Useful energy output (j) / useful energy input (j) } x100 |
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Weight (n) = |
Mass (kg) x Gravitational field strength (n/kg) |
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Power (w)= |
Energy transferred (j) / time taken (seconds) |
