1. A space probe may be carried by rocket into outer space. What keeps the probe moving after the rocket no longer pushes it?

2. Why do you seem to lurch backward when the bus picks up speed? What law applies here? 3. If you're in a car at rest that gets hit from behind, you can suffer a serious neck injury called whiplash. What does whiplash have to do with Newton's first law?

4. Start a ball rolling down a bowling alley and you'll find that it moves slightly slower with time. Does this violate Newton's law of inertia? Discuss and defend your answer.

5. What is the net force on a cart that is pulled to the right with 100 pounds of force and to the left with 30 pounds of force? Make sure to specify both numerical value (magnitude) and direction of the net force.

6. Rank the net forces on the blocks from least to most in the four situations, A, B, C, and D.