Homework

Review Homework Questions

4. What is the name of the property by which objects maintain their states of motion? Inertia

6. Why do we say velocity is a vector quantity and speed is not? Because velocity specifies direction as well as magnitude but speed is just magnitude.

7. How can you be both at rest and also moving at 100,000km/h at the same time? Because when you think you are standing still you are also moving through space. We are moving relative to the sun and stars. So right now our speed relative to the sun is 100,000km/h.

Review Homework Questions: September 1,2009

14. The reading on the right scale is 450 N 15. The reading on the scale is half of Nellie Newton's weight. 16. Because seat and the rope shares his weight but when he ties it to a falgpole the weight is not evenly distributed among the rope.

Homework Questions- September 17, 2009

10. Compared to the lighter car the heavier one rolls twice as slow. 11. Same force you used to push the crate. The friction is pushing oppositely to my directed 200N. 12. The small sports car's impact will b greater because the truck has more weight. The truck experiences the greatest acceleration because it will crush the sports car. 16. a) friction 17.a) gravity, string, air resistance b) yes because the rock is at rest. 18. a) air resistance, gravity, force put on rock upwards b) the longer vector is the force because it is going upward. Multiple Choice: 1. d 2. a 3. d 4. c 5. c 6. a 7. c 8. c 9. a 10. d