Recall that when a net force acts on an object, the object will accelerate, caus
ID: 249265 • Letter: R
Question
Recall that when a net force acts on an object, the object will accelerate, causing a change in its velocity. Hence the objects momentum (p = mv) will also charge. The impulse-momentum theorem describes the effect that an impulse has on an object's motion: Delta p = J - F Delta t. So the change in momentum of an object equals the net impulse, that is, the net force multiplied by the time over which the force acts. A given change in momentum can result from a large force over a short time or a smaller force over a longer time. In parts A, B, C consider the following situation. In a baseball game the batter swings and gets a good solid hit. His swing applies a force of 12,000 N to the ball for a time of 0.7 Times 10^-3 s. Assuming that this force is constant, what is the magnitude J of the impulse on the ball?Explanation / Answer
Part A:
Impulse is just force times change in time (equivalent to change in momentum):
J = Ft
J = 12000 * 0.00070
J = 8.4 Ns
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