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6.1 Work, 6.4 Power - Coggle Diagram
6.1 Work
6.3 Energy conversion and conservation of energy
Law of conservation
Total mechanical energy does not chage
When friction, total mechanical energy changes
KE+PE+work done by force= new KE+PE
6.2 Mechanical energy
Kinetic energy
Motion
(1/2) m v^2
Scalar, +ve
Potential energy
Elastic potential energy
Gravitational potential energy
PE: mgh
Change: delta h
Power
Definition of power
P=W/t
And velocity
P=Fv
V=gt
Energy transfer
Work= force parallel to s * s
W=Fs cos()
1J = 1Nm
Scalar, magnitude only
Work done against resistance force
1/2
m
(i_v^2 - f_v^2) + mg(delta h)
6.4 Power
W/t
Fs/t
P=F(s/t)
Fv
Instantaneous power
Constant v
Average power
t = how fast = rate
Energy transfer = work done