P1 - Conservation And Dissipation Of Energy (PAPER 1) Flashcards
what are the 8 stores of energy
- Chemical energy
- Kinetic energy
- Gravitational Potential energy
- Elastic Potential energy
- Thermal energy
- Nuclear energy
- Magnetic energy
- Electrostatic energy
How can energy be transferred between stores?
By heating, Burning, Falling, Moving, Ascending
What is the Conservation of energy
Energy cannot be created or destroyed
What is a closed system
A system where no energy transfers take place out of or into the system’s energy stores
How do changes within a closed system work
Energy can be transferred between the energy stores of the system, but not to any other energy stores
What is WORK
Work is done on an object when a force makes it move
How are energy and work related
Work done = Energy transferred
What is the formula for work done by a force
Work done (J) = force applied (N) x distance moved along the line of action of the force
What happens to work done to overcome friction
Work done to overcome friction is transferred as energy to the thermal energy store of the objects that rub together and to the surroundings
What happens to gpe stores of an object when it moves up and down
Moving up - more gpe
Moving down - less gpe
Why does the gpe store of an object increase as it goes up
More work is done on it to overcome the gravitational energy
what is the formula for the change of gpe store
change of gravitational potential energy store (J) = mass (kg) x gravitational field strength (N/kg) x change of height (m)
why is it easier to lift an object on the moon than on the earth
because the gravitational field strength is lower on the moon than on the earth
what is the gravitational field strength on the earth
9.8 / 10
what does the amount of energy in a kinetic energy store depend on
the object’s speed and mass
