Physics 45 Homework #1 due Monday, April 4

Chapter 1 Review Questions: 2, 4, 6, 7

In addition:

1. Look up the current phase of the Moon (hint: see the homepage and this link ). If the Moon is not full or new, is it waning or waxing? What time of the day is the best to view this phase of the Moon?

2. Why did Newton conclude that a force has to pull the Moon toward the Earth?

3. For each of the following, state whether a force is causing the observed motion and how you know.
(a) An object moves along a straight path at constant speed.
(b) An object moves along a straight path with an increasing speed.
(c) An object moves along a curved path with an increasing speed.
(d) An object moves along a curved path at constant speed.
(e) An object is at rest.

4. What is the difference between mass and weight?

5. Why would a baseball go higher if it were thrown up from the surface of the Moon than if it were thrown with the same velocity from the surface of the Earth?

Last updated March 28, 2005