A ball projected with backspin is descending in flight (going down) after reaching the peak of its parabolic trajectory. Which way will the Magnus force be directed? Express the direction relative to the person who has thrown the ball (assume there is minimal wind influencing the flight of the ball):Question 21Select one:a.away from the person and upwardsb.away from the person and downwardsc.towards the person and downwardsd.towards the person and upwardse.none of the answers are correct
Question
A ball projected with backspin is descending in flight (going down) after reaching the peak of its parabolic trajectory. Which way will the Magnus force be directed? Express the direction relative to the person who has thrown the ball (assume there is minimal wind influencing the flight of the ball):Question 21Select one:a.away from the person and upwardsb.away from the person and downwardsc.towards the person and downwardsd.towards the person and upwardse.none of the answers are correct
Solution
The Magnus force on a spinning ball is directed perpendicular to the velocity of the ball. In this case, since the ball is moving downwards and spinning backwards (backspin), the Magnus force will be directed upwards and towards the person who threw the ball. So, the correct answer is d. towards the person and upwards.
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