Newton homework

1. What is the SI unit of force and what other units is it made from?

2. What is Newton's major book and in what year what it published?

3. Consider a 100-N force acting on a 20 kg cart. Whist acceleration does it experience? What would the acceleration be if there were 40-N of friction resisting the motion?

4. You've seen a little fan cart demonstrated in class. Explain why it moves as it does, in terms of Newton's laws.

5. If you placed a sail on the cart (above), would it still move? Explain.

6. Explain each of Newton's laws.

7. What is your weight in newtons?

8. What would happen to your mass on the Moon? How about your weight? How would your answers change on Jupiter?

9. What is weightlessness and how does one experience it?

answers:

1. newton (N) = kg m/2^2
2. Principia Mathematica, 1687
3. 5 m/s/s; 3 m/s/s
4. Third law: fan blades push air; air returns the favor
5. You think about this one.
6. see notes
7. W = m(in kg) x 9.8 m/s/s. This will give you a weight in newtons.
8. mass does NOT change, but weight WILL change. On the Moon, your weight will be less (1/6 the original). On Jupiter, greater - around 2.5 times
9. You and your surroundings are accelerating together. Consider the 'vomit comet' plane.