If a ball hit with topspin contacts the ground with its linear speed less than its rotational speed:Question 15Answera.the bottom of the ball will be spinning backwards in relation to the ground, causing a forward reaction force on the ball which will decelerate the ballb.the bottom of the ball will be spinning backwards in relation to the ground, causing a forward reaction force on the ball which will accelerate the ball forwardc.the bottom of the ball will be spinning forwards in relation to the ground, causing a forward reaction force on the ball which will accelerate the ball forwardd.the bottom of the ball will be spinning forwards in relation to the ground, causing a backward reaction force on the ball which will decelerate the balle.the bottom of the ball will be spinning backwards in relation to the ground, causing a backward reaction force on the ball which will decelerate the ball
Question
If a ball hit with topspin contacts the ground with its linear speed less than its rotational speed:Question 15Answera.the bottom of the ball will be spinning backwards in relation to the ground, causing a forward reaction force on the ball which will decelerate the ballb.the bottom of the ball will be spinning backwards in relation to the ground, causing a forward reaction force on the ball which will accelerate the ball forwardc.the bottom of the ball will be spinning forwards in relation to the ground, causing a forward reaction force on the ball which will accelerate the ball forwardd.the bottom of the ball will be spinning forwards in relation to the ground, causing a backward reaction force on the ball which will decelerate the balle.the bottom of the ball will be spinning backwards in relation to the ground, causing a backward reaction force on the ball which will decelerate the ball
Solution
The correct answer is a. The bottom of the ball will be spinning backwards in relation to the ground, causing a forward reaction force on the ball which will decelerate the ball.
Here's why:
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When a ball is hit with topspin, the top of the ball moves in the same direction as the ball's linear motion, and the bottom of the ball moves in the opposite direction.
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If the ball's linear speed is less than its rotational speed when it contacts the ground, the bottom of the ball will be moving backwards relative to the ground.
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According to Newton's third law, for every action, there is an equal and opposite reaction. So, the ground exerts a forward force on the ball in response to the ball's backward motion.
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This forward force from the ground acts to decelerate the ball's linear motion.
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