Mechanical Energy Flashcards
what is work = to?
W = [F] • [d]
1N • 1m = 1J
What makes up mechanical energy
Kinetic Energy
Potential Energy
Isolated system
A system that does not experience:
- applied force
- friction
- air resistance (drag)
E = EK + EG = constant
∆E = 0
Non-isolated system
A system that DOES experience:
- applied force
- friction
- air resistance (drag)
∆E = W (work)
∆E = 0
(show why)
EK + EG = E = constant
∆EK + ∆EG = ∆E = 0
∆EK + ∆EG = 0
∆EK = - ∆EG
∆E = 0
EG
EG = mgh
EK
EK =
If Eg is constant
(non-isolated)
∆EK = W
( ∆EK + ∆Eg = W )
If EK is constant
(non-isolated)
∆Eg = W
( ∆EK + ∆Eg = W )
J / s = ?
1 J / 1 s = 1 W
1 watt
efficiency equation
efficiency = ( Eout / Ein ) • 100%
power equation
P = ∆E / ∆t
(P = J / s) = W (att)
what makes up J
N • m
m2 / s2
non-isolated system total ‘work’ equation
W = F • d • cosø
non-isolated ∆E equations
∆E = W
∆E =
∆E = E2 - E1
One Watt
is the power of an energy transformation that converts 1 Joule of energy into another form in one second
Specific heat capacity def.
the amount of heat absorbed that is required for 1kg of a substance to increase its temperature by 1 ˚C
(J / kg • ˚C)
1 Watt
the power of energy transformation that converts 1J of energy into another form, in one second.
1 Joule
the work done by 1N of force that produces a displacement of 1m
1 Kelvin
(TK)
TK = TC + 273.15
