Linear Momentum. Linear Momentum (p) Product of mass and velocity Equation p = mv Vector quantity with direction the same as v Unit kg-m/s.

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Presentation transcript:

Linear Momentum

Linear Momentum (p) Product of mass and velocity Equation p = mv Vector quantity with direction the same as v Unit kg-m/s

Relationship with Inertia More momentum something has, the harder it is to change its inertia Greater effect it will have if in an impact or collision A force is required to change an object’s momentum (increase it, decrease it, or change it’s direction)

Newton’s 2 nd Law Rate of change of momentum of a body is equal to the net force applied to it - more force,faster momentum changed F = ma a = Δv/t F = m(v 2 – v 1 ) / t F = p 2 – p 1 / t F = Δp / t

Example 1 For a top player, a tennis ball may leave the racket on the serve with a speed of 55 m/s. If the ball has a mass of 0.060kg and is in contact with the racket for 4 ms, what is the force on the ball?

Example 2 Water leaves a hose at a rate of 1.5kg/s with a speed of 20m/s and is aimed at the side of a car, which stops it. What force is exerted by the water on the car?

Example 3 If the water splashes back from the car at 15m/s, what is the force on the car?