- A body is in translational equilibrium when the vector sum of forces acting on it is zero. As a result, the body stays in one location.
- Moment (or torque) = F x perpendicular distance to pivot point
- A body is in rotational equilibrium when the sum of clockwise moments = sum of counter-clockwise moments. As a result, the body does not rotate.
- Momentum = mv
Momentum is a vector quantity, meaning it has direction as well as magnitude.
- Smv before collision = Smv after collision
- In an elastic collision, KE is conserved. In an inelastic collision, some or all of the KE is converted to sound, light, heat, and so forth.
- Impulse = change in momentum
Since F = ma = mDv/t
mDv = Ft
or impulse = Ft
- PE = mgh
- KE = ½mv2
- Work done = Fd
Where F is force and
d is distance
Power is the rate at which work is done
Power = Fd/t = Fv