Newton’s Third Law of Motion and Momentum Chapter 12 Section 3.

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Presentation transcript:

Newton’s Third Law of Motion and Momentum Chapter 12 Section 3

Action and Reaction Forces When a bumper car collides with another car, two forces are exerted. Each car in the collision exerts a force on the other. The force the bumper car exerts on the other car is the action force. The force the other car exerts on the first car is the reaction force. These two forces are equal in size and opposite in direction.

Newton’s 3 rd Law of Motion Whenever 1 object exerts a force on a 2nd object, the 2nd object exerts an equal & opposite force on the first object. Forces always act in pairs

Newton’s 3 rd Law of Motion Suppose you press your hand against a wall. Your hand exerts an action force on the wall. The wall exerts an equal and opposite reaction force against your hand. Examples 1.Walking on floor 2.Pushing on desk 3.Birds flying 4.Water sprinkler

Action- Reaction Forces and Motion A swimmer pushing against the water is an action force. The reaction force acting on the swimmer causes motion through the water.

Momentum product of an object’s mass and its velocity Mass measured in kilograms Velocity measured in meters/second Momentum measured kilogram*meters/second

Momentum An object with large momentum is harder to stop than an object with small momentum. The momentum for any object at rest is zero.

Momentum Car with large amount of momentum requires longer distance to stop a. speed limits b. accident reconstruction Example Kick of a gun

Momentum Which has more momentum, a kilogram golf ball with a speed of 60.0 meters per second, or a 7.0- kilogram bowling ball with a speed of 6.0 meters per second?

Conservation of Momentum A closed system means other objects and forces cannot enter or leave a system. In a closed system, the loss of momentum of one object equals the gain in momentum of another object— momentum is conserved.

Conservation of Momentum In each collision, the total momentum of the train cars does not change—momentum is conserved.

Conservation of Momentum In each collision, the total momentum of the train cars does not change—momentum is conserved.

Conservation of Momentum In each collision, the total momentum of the train cars does not change—momentum is conserved.

Momentum A class studied the speed and momentum of a kilogram ball dropped from a bridge. The graph shows the momentum of the ball from the time it was dropped until the time it hit the river flowing below the bridge.

Momentum Applying Concepts At what time did the ball have zero momentum? Describe this point in the ball’s motion.

Momentum Using Graphs At what time did the ball have the greatest momentum? What was the peak momentum value?

Momentum What is the ball’s speed after 1.25 seconds?