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Lecture 7 : Conservation of energy, potential energy & power - Coggle…
Lecture 7 : Conservation of energy, potential energy & power
Conservative and nonconservative Forces
Conservative Forces
Elastic
Electric
Gravitational
Nonconservative Forces
Friction
Air resistance
Tension in cord
Motor or rocket propulsion
Push or pull by a person
Potential Energy
Gravitational Potential Energy
Ug=mgh
Elastic Potential Energy
Ue=1/2kx^2
Fs=-kx
Mechanical energy and its conservation
Total mechanical energy, E=K+U
Its conservation, K2+U2=K1+U1
Principle of conservation of mechanical energy
If only conservative forces are doing work, the total mechanical energy of a system neither increases nor decreases in any process . It stays constant
Gravitational Potential Energy and Escape velocity
Power
Instantaneous Power , P=dW/dt
P=dE/dt
P=W/t
1W=1J/s
P=F.v
