Energy conservation laws in mechanics

Impulse
p = mv

Mechanical work
A = Fs

Mechanical work and the angle
A = Fs cos(a)

Power
N = A/t

Power
N = F v

Efficiency
η = A_n/A

Efficiency
η = P_n/P

Mechanical energy
E = E_k + E_p

Kinetic energy
E_k = mv^2/2

Kinetic energy and impulse
E_k = p^2/(2m)

Potential energy
E_p = mgh

Potential energy of the compressed (stretched) spring
E_p = kx^2/2