1. 1.Newton's first law of motion is often stated as - An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
2. Newton's first law of motion - sometimes referred to as the law of inertia.
3. Inertia: the resistance an object has to a change in its state of motion.
4. Example: Imagine a place in the cosmos far from all gravitational and frictional influences. Suppose that you visit that place (just suppose) and throw a rock. The rock will
5. Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has. A more massive object has a greater tendency to resist changes in its state of motion.
6. a. gradually stop.
7. b. continue in motion in the same direction at constant speed.
8. 3.Newton's third law is: For every action, there is an equal and opposite reaction.
9. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
10. a. with more force when the rope is attached to the wall.
11. !!
12. 2.The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced.
13. Newton's second law of motion can be formally stated as follows - The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
14. a = F/ m (m/s2)
15. F=ma (N)
16. Example: Determine the accelerations that result when a 12-N net force is applied to a 3-kg object and then to a 6-kg object.
17. F1 = - F2
18. Example: In the top picture (below), Kent Budgett is pulling upon a rope that is attached to a wall. In the bottom picture, Kent is pulling upon a rope that is attached to an elephant. In each case, the force scale reads 500 Newton. Kent is pulling ...
19. b. with more force when the rope is attached to the elephant.
