In Section 1.4, we considered the collision of a karate expert’s hand with a concrete block. Based on the graphs in Figure 1.31, the initial downward speed of the fist with mass 0.75 kg is about −13 m/s and the collision time is approximately 25 ms. Find the impulse and the average force exerted on the block by the fist during the collision.

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Asked Oct 6, 2019
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In Section 1.4, we considered the collision of a karate expert’s hand with a concrete block. Based on the graphs in Figure 1.31, the initial downward speed of the fist with mass 0.75 kg is about −13 m/s and the collision time is approximately 25 ms. Find the impulse and the average force exerted on the block by the fist during the collision.

 

 

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Expert Answer

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Impulse is the change in momentum. The fist comes to rest on collision with the briek. Impulse is Ap m(v

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Step 2
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Substituting the values Ap (0.75kg)(0m/s-(-13m/s) 9.75kg m/s

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Step 3
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A ccording to Newton's second law, the rate of change of momentum is equal to the applied force. (V - V) F = m- Ar

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Newtons Laws of Motion

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