Linear Momentum

Linear Momentum,[object Object]

Momentum,[object Object],Momentum – defined as “mass in motion”,[object Object],Think of 3 objects,[object Object],Car rolling fast down the street,[object Object],Car gently rolling down a driveway,[object Object],A person running along the road,[object Object],Which is hardest to stop?,[object Object],Momentum is the product of mass and velocity,[object Object],http://www.youtube.com/watch?v=VCNThVnThtE&feature=PlayList&p=F26D4868C108CE5F&playnext=1&playnext_from=PL&index=33,[object Object],Momentum is a vector quanitity measured in ,[object Object]

Impulse,[object Object],Throw an egg, build a device to catch it,[object Object],Two ways to stop it,[object Object],Large Force / small time,[object Object],Small Force / large time,[object Object],Impulse is the product of the force applied and the time it is applied for.,[object Object],A car of 1500kg traveling at 45m/s hits a brick wall and comes to a stop in .001m. What is the acceleration of the driver. What is the Force applied to the driver?,[object Object]

Remember F=ma, and ,[object Object],Therefore,[object Object],Multiply t and we have ,[object Object],This gives us,[object Object],or ,[object Object], Since momentum is the product of mass and velocity,[object Object],Momentum – Impulse Therom,[object Object]

Collisions,[object Object],Two types Elastic and Inelastic,[object Object],Elastic,[object Object],Momentum is conserved,[object Object],TME is conserved,[object Object],Generally involves rebound,[object Object],Inelastic,[object Object],Momentum is conserved,[object Object],TME is not conserved,[object Object],Generally involves two objects sticking together,[object Object]

Explosions,[object Object],When two objects are together and then separate it is called an explosion in physics.,[object Object],This applies to real explosions as well as other situations,[object Object],An explosion still conserves all momentum. Because initially the system has zero momentum, the resultant momentum must sum to zero.,[object Object],Kent Swimm, who is taking Physics for the third year in a row (and not because he likes it), has rowed his boat within three feet of the dock. Kent decides to jump onto the dock and turn around and dock his boat. Explain to Kent why this docking strategy is not a good strategy.,[object Object]

A rifle of mass 3.6kg fires a bullet with a mass of 20g at a velocity of 667.23m/s. How far does the rifle recoil?,[object Object],0.371m / Explosion,[object Object],An open cart on a level surface is rolling without frictional loss through a vertical downpour of rain, as shown above. As the cart rolls, an appreciable amount of rainwater accumulates in the cart. The speed of the cart will,[object Object],(A) increase because of conservation of momentum ,[object Object],(B) increase because of conservation of mechanical energy ,[object Object],(C) decrease because of conservation of momentum ,[object Object],(D) decrease because of conservation of mechanical energy ,[object Object],(E) remain the same because the raindrops are falling perpendicular to the direction of the cart's motion,[object Object]

A 70 kg woman and her 35 kg son are standing at rest on an ice rink, as shown above. They push against each other for a time of 0.60 s, causing them to glide apart. The speed of the woman immediately after they separate is 0.55 m/s. Assume that during the push, friction is negligible compared with the forces the people exert on each other.,[object Object],Calculate the initial speed of the son after the push.,[object Object],Calculate the magnitude of the average force exerted on the son by the mother during the push.,[object Object],How do the magnitude and direction of the average force exerted on the mother by the son during the push compare with those of the average force exerted on the son by the mother? Justify your answer.,[object Object],After the initial push, the friction that the ice exerts cannot be considered negligible, and the mother comes to rest after moving a distance of 7.0 m across the ice. If their coefficients of friction are the same, how far does the son move after the push?,[object Object]

Linear Momentum

Linear Momentum

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Linear Momentum