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1. An object can have constant speed without constant velocity, but it can't have constant velocity without constant speed. Explain.

2. You are wearing sandals and running across a plaza. The phone "pager" you are wearing on your hip falls off and lands on your toes painfully. How could this have happened? Shouldn't the pager have fallen behind you where it would have presented no danger to your feet?

3. If a person stands on a stool, his weight is a downward force of a certain size. The stool pushes up with a force. Are they of equal size and oppositely directed? Are they an action-reaction force pair? Elaborate.

4. A large truck and a Volkswagen "bug" have a head-on crash. Answer the following questions, and explain your answers.

a. Which vehicle experiences the larger impact force.

b. Which vehicle experiences the larger acceleration?

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