Momentum.

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Presentation transcript:

Momentum

Momentum Momentum is a property of moving objects

Impulse & Momentum A force acting over a given time (an impulse) can change an object’s momentum Example: If the wall exerts a force of 10,000 N and the contact time is 0.01 s. What is the impulse? What is the change in momentum? I = Impulse = F t = 100 Ns change in momentum = impulse = 100 Ns

Impulse and Contact Time

Conservation of Momentum You may wish to discuss the examples given in the text on p. 79 The total momentum of a system can’t change unless an external force is applied Interacting objects exchange momentum through equal and opposite forces

Spinning or orbiting objects have angular momentum Angular momentum = mass x velocity x radius L = m v r

This explains why objects rotate faster as they shrink in radius: Conservation of (angular) momentum: the angular momentum of an object can’t change unless an external twisting force is applied This explains why objects rotate faster as they shrink in radius: Discuss astronomical analogs: disks of galaxies, disks in which planets form, accretion disks… m x v x R = m x V x r

https://www.youtube.com/watch?v=07H5pIUXLhU For an orbiting body, this means if r is small, v is big and if r is big, v is small