Concept explainers
A rubber ball bounces. We’d like to understand how the ball bounces.
a. A rubber ball has been dropped and is bouncing off the floor. Draw a motion diagram of the ball during the brief time interval that it is in contact with the floor. Show 4 or 5 frames as the ball compresses, then another 4 or 5 frames as it expands. What is the direction of 46 m/s. during each of these parts of the motion?
b. Draw a picture of the ball in contact with the floor and identify all forces acting on the ball.
c. Draw a free-body diagram of the ball during its contact with the ground. Is there a net force acting on the ball? If so, in which direction?
d. During contact, is the force of the ground on the ball larger than, smaller than, or equal to the weight of the ball? Use your answers to parts a-c to explain your reasoning.
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