Work Energy And Power Flashcards
1
Q
Work energy theorem
A
Change in kinetic energy is the work done by the net force
2
Q
Work done by variable force
A
W = sigmaF(x)d(x)
3
Q
Potential energy formula
A
U(h) = mgh
F = -dU(h)/dh
= -mg
4
Q
Principle of conservation of mechanical energy
A
Total mechanical energy of a system is conserved if working forces are conservative
5
Q
Potential energy of spring
A
F(s) = -kx
6
Q
Work done by spring force
A
W(s) = -½kx²
7
Q
Power
A
Rate at which work is done
P = w/t = F×v
8
Q
Collisions
A
Elastic: back to original state without loss in K.E, Ki = Kf
Completely Inelastic: Deformation may nit be relieved
Inelastic: deformation partly relieved, Ki is lost
9
Q
Completely Inelastic collision in 1D
A
dK = ½[m1m2/m1+m2]u1²
10
Q
Head on collision
A
If Vi and Vf of both bodies are along same straight line
