6.3 Newton's Third Law pp. 142-146.

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Presentation transcript:

6.3 Newton's Third Law pp. 142-146

NEWTON’S THIRD LAW OF MOTION Whenever one object exerts a force on a second object, the second object exerts a force that is equal in size and opposite in direction on the first

NEWTON’S THIRD LAW OF MOTION All forces act in pairs called action-reaction force pairs. There can never be a single force, alone, without its action-reaction partner. If a force is exerted, another force occurs that is equal in size and opposite in direction to the first. ACTION-REACTION FORCE PAIRS DO NOT ACT ON THE SAME OBJECT!

6.3 Newton’s Third Law Newton’s Third Law (action-reaction) applies when a force is placed on any object, such as a basketball.

6.3 Collisions Newton’s third law tells us that any time two objects hit each other, they exert equal and opposite forces on each other. The effect of the force is not always the same.

MOMENTUM Momentum is a property of a moving object that depends on its mass and velocity. The more momentum an object has, the harder it is to stop the object or change its direction.

6.3 Momentum Momentum is the mass of a object times its velocity. The units for momentum are kilogram-meter per second (kg·m/s).

6.3 Momentum The law of conservation of momentum states that as long as the interacting objects are not influenced by outside forces (like friction) the total amount of momentum is constant or does not change.

6.3 Collisions When a large truck hits a small car, the forces are equal. The small car experiences a much greater change in velocity much more rapidly than the big truck. Which vehicle ends up with more damage?