A pencil standing upright on its eraser falls over and lands on the table. As th

Question

A pencil standing upright on its eraser falls over and lands on the table. As the pencil falls, its eraser does not slip. The following questions refer to the contact force exerted on the pencil by the table. Let the positive x direction be in the direction the pencil falls and the positive y direction be vertically upward. (a) during the pencils fall is the x component of the contact force positive, negative, or zero? Explain. (b) is the y component of the contact force greater than less than or equal to the weight of the pencil? Explain

Explanation / Answer

A/ positive because the weight of pencil is going down( negative ), so the table will response an upward normal force ( positive )

B/ Less than because the eraser does not slip that means it will rebounce once. The magnitude of change in momentum, therefore, increases.

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