Assignment - Newtons Laws

INSTRUCTIONS

Read the following questions and predict the answer. Then depress the mouse on the pop-up menu to view the answer.

1. Imagine a place in the cosmos far from all gravitational and frictional influences. Suppose an astronaut in that place throws a rock. The rock will:

a) gradually stop.

b) continue in motion in the same direction at constant speed.

2. An 2-kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving with the same speed and in the same direction?

3. Mac and Tosh are arguing in the cafeteria. Mac says that if he throws his jello with a greater speed it will have a greater inertia. Tosh argues that inertia does not depend upon speed, but rather upon mass. With whom do you agree? Why?

4. If you were in a weightless environment in space, would it require a force to set an object in motion?

5. Mr. Wegley spends most Sunday afternoons at rest on the sofa, watching pro football games and consuming large quantities of food. What effect (if any) does this practice have upon his inertia? Explain.

6. A 4.0 kg object is moving across a frictionless surface with a constant velocity of 2 m/s. Which one of the following horizontal forces is necessary to maintain this stateof motion?

A) 0 N B) 0.5 N C) 2.0 N D) 8.0 N E) depends on the speed.

7. An object is accelerating at 2 m/s2. If the net force is tripled and the mass of the object is doubled, what is the new acceleration?

8. While driving, Anna Litical observed a bug striking the windshield of her car. Obviously, a case of Newton's third law of motion. The bug hit the windshield and the windshield hit the bug. Which of the two forces is greater: the force on the bug or the force on the windshield?