P2 Flashcards
work done =
energy transferred
Work done formula
work done = force applied x distance moved in the direction of the force
W=Fd=ΔE
Law of conservation of energy
Energy cannot be created/destroyed. It can only be transformed into one type or another.
Define GPE
Gravitational Potential Energy
GPE formula
GPE = mgh
Define KE
Kinetic Energy. Measures how much mechanical/movement energy it has.
KE formula
KE = 1/2mv^2
Energy unit
(J) Joules
Energy efficiency formula
Energy efficiency = useful energy/power output / useful energy/power input x 100
The conservation of energy
When energy is transferred -> energy cannot be creeated/destroyed
Define power
the rate of energy transferred
Power formula
P = energy transferred / time taken
P(W or J/s) = W(J) / t(s)
Unit of power
(W) Watt
What is the source of energy for all our energy resources except geothermal, nuclear, and tidal?
the Sun
