Work, energy and power Flashcards
Energy is…
the ability to perform any work.
When work is done…
energy is transferred.
Energy cannot be…
destroyed or created only changed to other forms.
Work is…
the energy transfer that takes place when a force causes an object to move.
Work is done only when…
there is a change in energy.
Work done=
force applied x distance moved in the direction of the force
1j =
1 Nm
Kinetic energy =
0.5mv2
Force-distance graph:
-the area is the work done
When there is no constant force applied:
(F/2)d - =average force
Work done is positive when…
it is done by force and negative when it is done on the force.
Work done by gas=
pressure x change in volume
The equation for gas is relevant when:
- there is a constant pressure
- change in gas volume
Gravitational potential energy is…
the energy of an object due to its position in a gravitational field.
ΔEp=
mass x g x Δh
