4. You are driving down the road at a constant speed. Another car going a bit faster catches up with you and passes
you. Draw a position graph for both vehicles on the same set of axes, and note the point on the graph where the other
2. Starting from rest, object 1 is subject to a 12 N force for 2.0 s. Object 2, with twice the mass, is subject
to a 15 N force for 3.0 s. Which object has the greater final speed? Explain.
14. To win a prize at the county fair, you're trying to
1. Rub your hands together vigorously. What happens? Discuss the energy transfers and
transformations that take place.
2. Write a few sentences describing the energy transformations that occur from the time moving
water enters a hydroelectric pl
1. An object is acted upon by two (and only two) forces that are of equal magnitude and
oppositely directed. Is the object necessarily in static equilibrium?
4. Suppose you are hanging from a tree branch. If you move out the branch, farther away
5. If you have ever driven a truck, likely found that it had a steering wheel with a larger diameter than that
of a passenger car. Why is this?
6. A common type of door stop is wedge made of rubber. Is such a stop more effective when jammed
1. A hockey puck slides along the surface of the ice. If friction and air resistance are negligible,
what force is required to keep the puck moving?
2. If an object is not moving, does that mean that there are no forces acting on it? Explain.
1. a. write a paragraph describing the particle model. What is it, and why is it important?
b. Give two examples of situations, different from those described in the text, for which the particle model is
c. Give two examples of situ
1. The batter in a baseball game hits a home run, as he circles the bases, is his angular velocity positive or
2. Viewed from somewhere in space above the north pole, would a point on the earth's equator have a
positive or negative ang
1. An object is subject to two forces that do not point in opposite directions. Is it possible to
choose their magnitudes so that the object is in equilibrium? Explain.
3. What forces are acting on you right now? What net force is acting on you
a. car a vector have nonzero magnitude if a component is zero? If no, why not? If yes, give an example.
b. can a vector have zero magnitude and a nonzero component? If no, why not? If yes, give an example.
2. Is it possible to add a scalar to
1. The Brake shoes of your car are make of a material that can tolerate very high temperatures
without being damaged. Why is this so?
2. When you pound a nail with a hammer, the nail gets quite warm. Describe the energy
transformations that lead