1. Linear Momentum 7.1

2. Momentum Linear momentum  p = mv  Moves along a straight line

3. Momentum and Newton’s Second Law F = ma F = (m·Δv)/Δt F = Δp/Δt A net force exerted on an object equals the rate of change of the object’s linear momentum.

4. Impulse Impulse is the product of force and the time interval over which the force acts. Impulse = F·Δt Impulse = momentum change Same as momentum units (kg·m/s) but we use N·s to distinguish the two. Follow-through in baseball, tennis, golf, etc.

5. Newton’s Third Law of Motion Forces come in pairs—action and reaction

6. Conservation of Linear Momentum Closed system—does not lose or gain mass Isolated system—a closed system on which no net external forces act When no net external forces act on a closed system, the total linear momentum of the system remains constant.