Warmup 14: Momentum

Course

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The first three questions refer to the material you were to read in preparation for the lesson. Questions one and two require you to write a three or four sentence response. Number three is a multiple choice question. Click in the appropriate circle. Questions 4 is your opportunity to suggest what we should emphasize today and how.

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button at the bottom of this page.

1.

The red ball in the diagram is chasing after the blue ball. The speed of the red ball is 3 m/s the speed of the blue ball is 2 m/s. After the collision the red ball rebounds at 2 m/s and the blue ball speeds away at 3 m/s.
What was the change in velocity experienced by the red ball during the collision?
What was the change in velocity experienced by the blue ball during the collision?
If the mass of the red ball is the same as the mass of the blue ball, was total momentum conserved during this collision?

2.

Estimate the force on a 145 gram baseball if it reverses direction at 50 miles per hour and stays in contact with the bat for 0.1 second. Express the result in newtons and in pounds.

3.

A 50 g piece of clay hits a stone at 80 m/s and sticks to it. The clay momentum must change by

80 Ns

40 Ns

neither A nor B

more data is needed to answer

4. Below is a space for your thoughts, including general comments about today's assignment (what seemed impossible, what reading didn't make sense, what we should spend class time on, what was "cool", etc.):

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button.

I received no help from anyone on this assignment.