Y1 Ch 10 Work, Energy and Power Flashcards
Energy definition
The ability to do work
Energy stores
Kinetic energy, Gravitational potential, Thermal, Chemical, Elastic Potential, Nuclear energy.
Energy transfer mechanisms
Mechanical, Electrically, Heating/thermal, Radiation.
Conservation of energy
Energy cannot be created or destroyed it can only be transferred from one store to another.
Efficiency definition
The measure of the proportion of energy transferred usefully.
Efficiency Equation
useful energy/Total energy.
Work done definition
a mechanical transfer of energy.
Work done equation
force * distance
The amount of work done when an object is travelling in a circle
none
Power definition
The rate at which work is done or energy is transferred
Power units
Watts
Kinetic energy definition
The energy stored in a moving object.
GPE Definition
The energy an object gains when it does work against gravity
Elastic energy equation
1/2 force* extension
