Inquiry Into Physics
8th Edition
ISBN: 9781305959422
Author: Ostdiek, Vern J.
Publisher: Cengage Learning,
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Chapter 3, Problem 5P
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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A ball of mass 2 kg with speed 20.0 m/s collides with a wall and bounces back with a speed of 15 m/s. If the motion is in a straight line, calculate the initial and final momentum and impulse. If the ball exerted an average force of 1 kN on the wall, how long did the collision last?
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Determine their common velocity just after the collision.
Express your answer to three significant figures and include the appropriate units.
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USING THE UAM FORMULA, SOLVE THIS
1. A 6 kg object accelerates at 2.5 m/s^2 after a force is applied for 10s. Find the(a) Force applied.
(b) speed of the object at the end of 10 s,
(c) change in momentum of the block, and
(d) impulse produced by the force.
2. How much force is needed to stop a 10 kg object moving at 4 m/s in just 10 s? Explain your answer.
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Inquiry Into Physics
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