Conservation And Dissipation Flashcards
Chemical energy examples:
Fuels, food, batteries
Kinetic energy storage examples:
A moving object
Gravitational potential energy storage examples:
An object that’s above ground
Elastic potential energy stores examples:
An object that is stretched or squashed
Thermal energy storage examples:
The energy an object has because of its temperature
True or false: energy can be transferred from one store to another
True
Describe the transfer rate of an object hitting the floor with a thud
All of its kinetic energy is transferred by heating to the thermal energy store of the object and the floor, and by sound waves mov8ng away from the point of impact.
Gravitational potential energy - kinetic energy - energy transfer to the
- sound waves
surroundings
- increase in the thermal energy store of the surroundings
What is the name of the energ store associated with a compressed spring?
Elastic potential energy
Energy cannot be - - or - -
Created or destroyed
Can energy be stored?
Yes
Can energy be dissipated?
Yes
What is a closed system
An object or group of objects with no energy transfers taken place out of or into energy stores
Describe the changes of stores of energy when going on a rollercoaster ride that goes up then down
As it goes up gpe increases and as in goes down gpe decreases most of it transfers to kinetic energy so kinetic energy therefore increases
When an object mobpves by force, energy is transferred to the object and —-is done on it
Work
Both work and energy have what unit in common?
J (joules)
Work done= force applied times distance
Simplify this
W
F. S
What is friction
When 2 surfaces rub against eachother
Change in objects gravitational potential energy store = weight x what?
Change of height
Change of gravitational potential energy store = what?
Mass x gravitational field strength x change of height
How do you calculate potential energy
Kinetic energy= 1/2 x mass x speed of object in metres per second squared
How do you calculate elastic potential energy
Epe = 1/2 x spring constant x extension of the spring squared
What is useful energy
Energy transferred t where it is wanted in the form wanted
What is wasted energy
Energy not usefully transferred
What happens to wasted energy
It dissipates
