Warm-Up 10/17/13 Some force occurs through transfer. An example is the force of the white cue ball on a colored pool ball. Sketch BEFORE and AFTER drawings.

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Presentation transcript:

Warm-Up 10/17/13 Some force occurs through transfer. An example is the force of the white cue ball on a colored pool ball. Sketch BEFORE and AFTER drawings of the pool ball scenario. Draw in arrows to show the magnitude (size) and the direction of the velocity for the object that is moving in the BEFORE and AFTER sketches.

Thursday 10/17/13 12.3 Momentum

Momentum = Mass x Velocity Momentum is the product of an object’s mass and velocity. Objects with a large momentum are hard to stop! Ex) Semi truck vs. bicycle Momentum = Mass x Velocity

Practice Pick two of the following cars and imagine the momentum of each in a car crash. Remember: the larger the momentum, the harder it is to stop!

Momentum = Mass x Velocity Vehicle Curb Weight (kg) Velocity (m/s) Smart Car 822 24.75 (55mph) Pontiac G6 1,571 Chevy Impala 1,616 F150 2,130 GMC Yukon 2,643 Semi+trailer 9,091 38’ School Bus 10,000 Momentum = Mass x Velocity

Conservation of Momentum Law of Conservation of Momentum= if no net force acts on a system (2+ objects) then the total system does not change. Momentum is not gained or lost in collisions

Calculating Conservation Momentum of cue ball = (mcb)(vcb) Momentum of yellow ball = (myb)(vyb) Conservation requires that the momentum before and after is the same! (mcb)(vcb) = (myb)(vyb)

Your Job Take the next 15-20 minutes and design your egg’s container for tomorrow’s egg drop. Show me the sketch and materials list. HW: Newton’s Laws and Momentum WS DUE Monday ALL EGG MATERIALS NEED TO BE BROUGHT IN TOMORROW