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Chapter7:Conservation of Energy, FOO SIN YEW A20SC0079 - Coggle Diagram
Chapter7:Conservation of Energy
Forces
Conservative forces
The net work done by the force on anobject moving around any closed path is zero.
Nonconservative forces
The dissipative forces such as friction or air resistance.
Potential Energy
The stored energy that depends upon the position of an object.
PE=mgh
U grav=mgh
W=mgh
Force exerted by a spring
Unstretched
x=0
Stretched
Fs = -kx
x > 0
Compresses
Fs = kx
x < 0
Fs > 0
U=1/2 kx^2
Mechanical Energy and Its
Conservation
Total mechanical
energy
E=K + U
Conservation
K1+U1=K2+U2
Principle of conservation of mechanical
energy
The total mechanical energy in a closed system in the absence of dissipative forces remains constant.
Law of conservation of energy
Energy cannot be created or destroyed,but it can change from one form to another form.
Gravitational potential energy
Escape velocity
Power
The rate of change of work done
Average power
Instantaneous power
P=dE/dt
P=Fv
FOO SIN YEW A20SC0079
