P1 Energy And Energy Resources Flashcards
In what ways can energy be transferred?
Heating, waves, electric current, or when a force moves an object
Principle of conservation of energy
Energy cannot be created or destroyed
What is a closed system?
A system in which no energy transfers take place out of or into the energy stores of the system
Energy transferred=
Work done
Work done (J) =
Force applied (N) x distance moved along the line of action of the force (m)
Ep=
mgh
Change of gravitational potential energy store, ΔEp =
Mass, m x gravitational field strength, g x change of height, Δh
Unit for gravitational field strength
N/kg
The gravitational potential energy store of an object increases when…
It is lifted up as work is done on it to overcome the gravitational force
Kinetic energy, Ek =
1/2 x mass x speed^2
Ek=
1/2 x m x v^2
Elastic potential energy store, Ee=
1/2 x spring constant, k x extension^2, e^2
Ee=
1/2 x k x e^2
What is elastic potential energy
The energy stored in an elastic object when work is done on it
Useful energy
Energy that is transferred to where it is wanted in the way that it is wanted
