physics topic 1 - energy
- Created by: riley290652
- Created on: 24-11-18 18:30
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- physics - energy stores and systems
- types of energy stores
- thermal
- kinetic
- gravitational potential
- elastic potential
- chemical
- magnetic
- electrostatic
- nuclear
- energy systems
- a system just means a single object or a group of objects
- when a system changes, energy is transferred
- closed systems are systems where neither matter nor energy can enter or leave
- the net change in the total energy of a closed system is always 0
- energy transfer
- energy can be transferred by heating
- energy can be transferred by work done
- work done is another way of saying energy transferred
- work can be done when current flows or by a force moving an object
- examples of work done
- the initial force exerted by a person to throw a ball does work
- it causes an energy transfer from the chemical energy store of the person's arm to the kinetic energy store of the ball from the arm
- the friction between a car's brakes and its wheels does work as it slows down.
- it causes an energy transfer from the wheel's kinetic energy stores to the thermal energy store of the surroundings
- the initial force exerted by a person to throw a ball does work
- types of energy stores
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