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## Homework Statement

Stick of mass

**M**resting on frictional surface with friction coefficients μ

_{k}=μ

_{s}. From the center of the stick at time

**t=0**a ball of mass

**m**thrown to the right with an angle

**θ**above the horizontal and with speed

**v**. As a result of the throwing there is an impulse on the

_{0}**y**axis (perpendicular to the horizontal stick) between the stick and the surface for short time

**Δt**.

Calculate the impulse of the normal force between the surface and the stick. Assume the interaction time is short Δt→0?

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How am I formulate the equation- 1. When I calculate the change in momentum is p

_{f}=0 because the stick does not move vertically? 2. Is the acting force on the stick is F=N(t)−Mg because the normal on M by the ball is internal force?