Work, Energy and Power Flashcards
1
Q
Law of Conservation of Energy
A
energy cannot be created or destroyed but is converted from one form to another
2
Q
Work
A
- the energy given to a body by a force moving it through a displacement in the same direction as the applied force
- symbol = W
- unit = J
3
Q
Work equation
A
- W = Fs
work = J, Force = N, displacement = m
4
Q
Energy
A
the ability to do work
5
Q
Potential energy
A
energy due to position or conformation
6
Q
Gravitational Potential Energy
A
Ep = mgh
potential energy = J, mass = kg, gravitational acceleration = m/s², height above ground = m
7
Q
kinetic energy
A
energy due to movement
8
Q
kinetic energy equation
A
Ek = 1/2 mv²
9
Q
Mass-energy equivalence
A
E = mc²
10
Q
Power
A
- the rate at which work is done
- symbol = P
- unit = watts or Joules/second
11
Q
Power equation
A
P = W/t
12
Q
efficiency
A
power output divided by power input
13
Q
% efficiency
A
Power output/ Power input x 100
