P2207_fall10_lecture24 - A ball of mass m, attached to a...

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A ball of mass m, attached to a string of length L, is released from rest at angle 0 and then strikes a standing wooden block. Is the block more likely to tip over if the ball bounces off of the block or if the ball doesn't bounce? A. Bounces B. Doesn't bounce C. Equally likely in both cases m L v = 0 o o
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Today: Collisions, Collisions, Collisions… Airbags and shock absorbers The woodpecker (why don’t they knock themselves silly) The gravitational “Slingshot” effect Types of collisions: elastic and inelastic
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Shock Absorbers: Impulse J = F dt = F av t = p Key idea : Reduce F av , F max by making t of collision longer! F on object during collision t F max t
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Car Collision without Airbags:
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Car Collision with Airbags:
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Foot arches (padded running shoes, paw pads. ..) Walking : at least one foot in contact with ground at all times Running : ~ a series of leaps Vertical force exerted on one foot during one stride: Weight W 2.5 W 1/2 T stride Equal areas = W T/2
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Load [kN]
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P2207_fall10_lecture24 - A ball of mass m, attached to a...

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