Momentum.

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Presentation transcript:

Momentum

–30 kg m/s. –20 kg m/s. –10 kg m/s. 10 kg m/s. 30 kg m/s. The cart’s change of momentum is –30 kg m/s. –20 kg m/s. –10 kg m/s. 10 kg m/s. 30 kg m/s. STT9.1

–30 kg m/s. –20 kg m/s. –10 kg m/s. 10 kg m/s. 30 kg m/s. The cart’s change of momentum is –30 kg m/s. –20 kg m/s. –10 kg m/s. 10 kg m/s. 30 kg m/s. STT9.1

An explosion in a rigid pipe shoots out three pieces An explosion in a rigid pipe shoots out three pieces. A 6 g piece comes out the right end. A 4 g piece comes out the left end with twice the speed of the 6 g piece. From which end does the third piece emerge? Left end Right end STT9.4

An explosion in a rigid pipe shoots out three pieces An explosion in a rigid pipe shoots out three pieces. A 6 g piece comes out the right end. A 4 g piece comes out the left end with twice the speed of the 6 g piece. From which end does the third piece emerge? Left end Right end STT9.4 This must be so in order for final momentum to match initial momentum of zero.

Objects A and C are made of different materials, with different “springiness,” but they have the same mass and are initially at rest. When ball B collides with object A, the ball ends up at rest. When ball B is thrown with the same speed and collides with object C, the ball rebounds to the left. Compare the velocities of A and C after the collisions. Is vA greater than, equal to, or less than vC? vA > vC vA = vC vA < vC STT9.3

Objects A and C are made of different materials, with different “springiness,” but they have the same mass and are initially at rest. When ball B collides with object A, the ball ends up at rest. When ball B is thrown with the same speed and collides with object C, the ball rebounds to the left. Compare the velocities of A and C after the collisions. Is vA greater than, equal to, or less than vC? vA > vC vA = vC vA < vC STT9.3 The total change in momentum must be zero in both cases. The ball has a larger change in momentum after hitting object C. C must have an equal and opposite change in momentum.