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**DISCUSSION and HINTS**

The animation below shows the impact of particle B with the bar.

Animation at slowed playback speed:

Free-frame of motion immediately after impact.

Recall the following *f**our-step plan* outline in the lecture book and discussed in lecture:

**Step 1: FBDs**

Draw a single free body diagram (FBD) of the particle and bar.

**Step 2: Kinetics (Newton/Euler)**

Using your FBD above, sum moments about point A . Consider the time of the impact to be short such that there is no change in position of either the bar or B during impact. Also, consider the particle to be of small physical dimensions.

What does your moment equation above say about the angular momentum of the system about point A?

**Step 3: Kinematics**

What kinematics do you need to solve this problem?

**Step 4: Solve**

From your equations in Steps 2 and 3, solve for the angular velocity of the bar immediately after impact.