Unit 1- Work And Power Flashcards
You can’t…… Energy
Create or destroy
Name three stored energy’s
- chemical
- gravitational
- elastic
Name six transfer energy
- electricity
- Thermal
- heating
- sound
- light
- mechanical
What is Kinetic energy?
Is the energy a moving object had
What is energy stored in molecules and an example
Is chemical energy like batteries and fuels
Potential energy is an example of what? And two examples
Stored energy for example elastic strain energy and gravitational potential energy (GPE)
To summarise energy transfers you can use….
- simple energy transfer diagrams
- skakey diagrams
What is the equation for efficiency
Efficiency= useful energy output/ energy input x 100
What are Energy Mass Distance Weight Time Power Speed Acceleration Measured in
J Kg M N S W M/S M/S2 (squared)
What does K mean?
Kilo, which mean x 100
Equation for GPE (there are two)
GPE= weight x height moved
And
GPE= mass x gravity (10) x height
Equation for work done (there is two)
Work done= Force x distance travelled done in the same direction
And
Work done= GPE + sound + heat
What is the equation for weight
Weight= mass x gravity (10)
Equation for power
Power= energy
(W) (J)
transferred or work done/ time
(S)
What is power defined as
As the rate of energy transfer: ie how much energy is transferred every second
