Ch6 - Chapter 6 Momentum and Collisions 06CO p 161 Momentum The linear momentum p of an object g y of mass m moving with a velocity v is defined as

Info iconThis preview shows pages 1–17. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 6 Momentum and Collisions
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
06CO, p. 161
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Momentum The linear momentum of an object of mass m moving with a velocity p v is defined as the product of the mass and the velocity m pv p x = m v y Vector quantity SI Units: kg m / s
Background image of page 4
Momentum and Kinetic Energy Magnitude of the momentum is lated to the kinetic energy related to the kinetic energy p mv mv KE ) ( 1 1 2 2 2 2 p E m m 2 2 2 2 KE m
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Net Force and Rate of Change of Momentum t t m t m m p v v a F net ) ( In order to change the momentum of an object, a force must be applied The time rate of change of momentum of an object is equal to the net force cting on it acting on it p F net t
Background image of page 6
Impulse When a single, constant force acts n an object during a time interval on an object during a time interval t, there is an impulse delivered to e object the object ector uantity t  IF  Vector quantity SI Units: kg m / s
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Impulse-Momentum Theorem The impulse acting on the object is qual to the change in momentum equal to the change in momentum of the object  m m F p v v If the force is not constant, use the verage force pplied  fi tm IF average force applied
Background image of page 8
Fig. 6.3, p. 164
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Average Force in Impulse The average force can be thought of as e constant force the constant force that would give the same impulse to the object in the time interval as the actual time-varying force yg gives in the interval v   p av t  Fp
Background image of page 10
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Impulse Applied to Auto Collisions The most important factor is the ollision time or the time it takes collision time or the time it takes the person to come to a rest his will reduce the chance of dying This will reduce the chance of dying in a car crash ays to increase the time Ways to increase the time Seat belts ir bags Air bags
Background image of page 12
Problem 6.5 A baseball player of mass 84.0 kg running at 6.70 m/ s slides into home plate. a) What magnitude impulse is delivered to the player by friction? b) If the slide lasts 0.750 s, what average friction force is exerted on the player? 13
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Collisions Isolated systems do not have external forces (for example; gravitational force or friction) acting on them A collision may be the result of physical contact between two objects electrostatic interactions of the electrons in the surface atoms of the bodies
Background image of page 14
xample of a Head- n Example of a Head on Collision The momentum of each object will change i m m t 1 1f 21 v v F 1 1 i m m t 2 2 2 2 12 v v F f But, from Newton’s 3 rd law 12 21 F F t t 12 21 F F ) ( 2 1 2 2 1 1 i i m m m m v v v v f 1 1f
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Conservation of Momentum hen no external forces act on a system f 1 v v v v 2 2 1 1 2 2 1 m m m m f i i When no external forces act on a system, the total momentum of the system remains onstant in time constant in time Momentum is conserved for the system of objects
Background image of page 16
Image of page 17
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/05/2009 for the course PHY 1603 taught by Professor Boudreaux during the Spring '08 term at The University of Texas at San Antonio- San Antonio.

Page1 / 56

Ch6 - Chapter 6 Momentum and Collisions 06CO p 161 Momentum The linear momentum p of an object g y of mass m moving with a velocity v is defined as

This preview shows document pages 1 - 17. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online