Open Query 25

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course Phy 121

025. `query 25*********************************************

Question: `qprinciples of physics and gen phy 4.26 free-body diagram of baseball at moment hit, flying toward outfield

gen phy list the forces on the ball while in contact with the bat, and describe the directions of these forces

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Your solution: I drew the free body diagram and the forces are all correct.

confidence rating #$&*

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Given Solution:

`a** Gravity exerts a downward force equal to the weight of the ball.

While in contact with the ball, and only while i contact, the bat exerts a normal force, which pushes outward along a line originating from the central axis of the bat. This force is perpendicular to the surface of the bat at the point of contact.

Unless the direction of the ball is directly toward the center of the bat, which will not be the case if the ball is hit at an upward angle by a nearly level swing, there will also be a frictional force between bat and ball. This frictional force will be parallel to the surface of the bat and will act on the ball in the 'forward' direction.

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Self-critique (if necessary): OK

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Self-critique rating #$&* OK

&#This looks very good. Let me know if you have any questions. &#

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