Momentum.

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MOMENTUM and IMPULSE LINEAR MOMENTUM Momentum describes an object’s motion Momentum describes an object’s motion Momentum  a vector quantity defines as.

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Presentation transcript:

Momentum

Why is it easier to run through something when you are going at a greater speed?

The Stats Momentum – Inertia of moving objects Units: kg * m/s Symbol: p

A moving object can have a large momentum if it has a large mass, a high speed, or both

FORMULAS!!! p = m * v A 2250 kg pickup truck has a velocity of 25 m/s to the east. What is the momentum of the truck? (2250 kg)(25 m/s) = 56,000 kg m/s to the east p = momentum (kg m/s) m = mass (kg) v = velocity (m/s)

Impulse Changes Momentum The change in momentum depends on the force that acts and the length of time it acts. Impulse = change in momentum = Δmv Impulse = F Δ t Soooo…… F Δ t = Δmv F = force (N) t = time (s)

More Formulas!! Mass does not usually change So the official formula for change in momentum: F Δ t = m Δ v F Δ t = m (vf –vi)

A 1400 kg car moving westward with a velocity of 15 m/s collides with a utility pole and is brought to rest in 0.3s. Find the force exerted on the car during the collision.