The average force in this case is more than half of the peak value. Looking at the graph shows that the peak force on the tennis ball is between 80 and 85 N. If we define a y-axis pointing upward, then we can find the average force exerted on the tennis ball in the y-direction during the collision by using:īased upon the data in the graph, we approximate the duration of the collision ( t f - t i) to be approximately 5.75 ms. In the table, v 1 is the tennis ball's speed just before the collision (it is traveling downward) and v 2 is the tennis ball's speed just after the collision (it is traveling upward). Using the collision data provided in the table, we can compute the time-averaged force experienced by the tennis ball and compare it with the force profile. They have asymmetries.Ĭomparison of force profile with time-averaged force. They are certainly not flat horizontal lines (which would indicate constant force).
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