Momentum.

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Presentation transcript:

Momentum

Newton’s 1st law of motion: An object in motion stays in motion and an object at rest stays at rest unless acted on by an outside force.

Objects in motion have momentum. Momentum tells us how difficult it is to stop an object.

You are playing football. Which lineman would you rather go against?

You are playing baseball You are playing baseball. The pitcher throws the ball too low and it hits you in the leg. Which picture would hurt more?

Momentum depends on: Mass: Velocity: more mass = more momentum more velocity = more momentum

Momentum = mass x velocity p = mv Momentum is a vector since it has both magnitude and direction. Momentum is measured in kg·m/s

A 10 kg ball is thrown at 40 m/s. What is the momentum? p = mv p = 10 x 40 p = 400 kg·m/s

What is the mass of a ball thrown at 30 m/s if the momentum is 600 kg·m/s? p = mv 600 = m x 30 m = 20 kg

What is the velocity of a 20 kg ball with a momentum of 300 kg·m/s? p = mv 300 = 20 x v v = 15 m/s