Ch. 9 slides Momentum.ppt.

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Presentation transcript:

Ch. 9 slides Momentum.ppt

Shooting pool A pool ball, mass 0.1 kg with a velocity of 2 m/s hits the edge of the table at a 45 degree angle and bounces off at the same angle. What is the change in momentum in component form? Make sure to draw a coordinate system. What is the average force if the ball is in contact with the table for 10 ms? If the ball now hits the edge of the table at 30 degrees, how does this affect the change in momentum and average force? Momentum.ppt

Skater Amy, 75.2 kg, is riding on a huge 38.6 kg skateboard traveling at a speed of 2.33 m/s. She jumps off in such a way as to land on the ground with zero horizontal speed. Find the resulting change in the speed of the skateboard. (ans. 4.54 m/s) Momentum.ppt

Bullet Through Block A 3.54-gram bullet is fired horizontally at a block resting on a frictionless tabletop. The bullet passes entirely through the block, exiting with a speed of 92.2 m/s. The mass of the block is 1.22 kg and as a result of the collision, it attains a speed of 0.630 m/s. What was the original speed of the bullet (vbi)? Define your system. If it took the bullet 1 ms to pass through the block, what was the average force exerted by the bullet on the block? The block on the bullet? Define your system(s). (You may need a different choice of system than before.) (ans.: vbi = 309 m/s, AVG F bullet on block = 769 N) Momentum.ppt

Crash A 2000 kg SUV and a 1000 kg Honda Accord collide at an intersection. The stoplight has just turned green, and the SUV, heading north, drives forward into the intersection. The Accord, traveling west, fails to stop. The officer responding to the accident sees that the skid marks go 37.5° northwest from the point of impact. The SUV driver reports that he was traveling 3 m/s when the accident occurred. What is the velocity vector of the Accord just before the collision? Momentum.ppt

Rocket A 1000 kg rocket blasts off with fuel being expelled at a rate of 10 kg/s. What minimum exhaust speed does the fuel have to come out so that the rocket can get off the ground? If the rocket’s exhaust velocity is twice the minimum, what is its initial acceleration? Momentum.ppt