lesson 3.3 Momentum

lesson 3.3 Momentum - Momentum A moving object has a...

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Momentum A moving object has a momentum determined by its mass and velocity. Momentum is the product of mass and velocity Momentum is represented by P and is measured in kg.ms -1 . Consider a car of mass m moving with a velocity v o . It is acted upon by a force F which produces an acceleration a on it. It has a velocity v f after a time t F = ma m(v f – v o ) = P , the change in momentum in the interval t F f o v v v a t t - = = ( ) f o m v v t - = Momentum is a vector quantity 1

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This leads us to conclude that: Force is the rate of change of momentum. Kinetic energy and momentum The kinetic energy K of a moving object can be expressed in terms of its momentum. 2 1 2 K mv = 0 ( ΔP Δ ) = t F f m v v t = - 2 2 2 m v m = 2 2 P m = 2
A 0.5 kg ball is thrown in the x direction with a velocity 10 m.s -1 . It hits a wall and rebounds with the same speed. What is the change in momentum of the ball? The change in momentum P = P f – P i P = -10 kg.mas -1 i m = 0.5 kg, v = 10 ms i , v = -10 ms i 3

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A 0.5 kg ball is thrown against a wall at an angle of 53 o as shown on the right with a velocity of 10 m.s -1 speed and at an angle 53 o . Find the change in momentum of the ball. 3 i 4 j P f P i 53 o = 3 i + 4 j = -3 i + 4 j -3 i = 4 j = -6 i 53 o 53 o 127 o 127 P i drawn from the origin makes an 4
A loaded dump truck with a total mass of 5.0 × 10 3 kg traveling at 3.0 km.h -1 coasts into a loading dock and collides coming to a stop in 0.64 s. What is the magnitude of the average force exerted on the truck by the dock?

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This note was uploaded on 05/01/2011 for the course PHY 2048 taught by Professor George during the Fall '10 term at Edison State College.

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lesson 3.3 Momentum - Momentum A moving object has a...

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