12.3 newton’s third law of motion and momentum newton’s third law whenever one object exerts a...

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2.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.

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Page 1: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

Newton’s Third Law

Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.

Page 2: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

Action and Reaction Forces

• Action Force - the force of one object on another object.

•These two forces are equal in size and opposite in direction.

•Reaction Force – the force the other object exerts back.

Page 3: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

Suppose you press your hand against a wall.

• Your hand exerts an action force on the wall.

• What exerts the equal and opposite reaction force against your hand?

The Wall

Page 4: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

A swimmer pushing against the water is an action force.

What is the reaction force?

The reaction force is the water acting on the swimmer causing motion through the water.

Page 5: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

Action-reaction forces propel the swimmer through the water. The swimmer pushes against the water, and the water pushes the swimmer.

Newton’s Third Law

Page 6: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

Action-Reaction Forces Do Not Cancel

For the swimmer, why do the action and reaction forces not cancel each other and produce a net force of zero?

The action and reaction forces do not act on the same object.

Page 7: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

Momentum is the product of an object’s mass and its velocity.

Momentum

Page 8: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and 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

Page 9: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

Mass is measured in kilograms.

Velocity is measured in meters per second.

Momentum is measured kilogram-meters per second.

Momentum

Page 10: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

Which has more momentum, a 0.046-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?

Momentumgolf ball = 0.046 kg × 60.0 m/s = 2.8 kg•m/s

Momentumbowling ball = 7.0 kg × 6.0 m/s = 42 kg•m/s

The bowling ball has considerably more momentum than the golfball.

Momentum

Page 11: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

Conservation of Momentum

In a closed system, the loss of momentum of one object equals the gain in momentum of another object— momentum is conserved.

A closed system means other objects and forces cannot enter or leave a system.

Page 12: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

Objects within a closed system can exert forces on one another.

According to the law of conservation of momentum, if no net force acts on a system, then the total momentum of the system does not change.

Conservation of Momentum

Page 13: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

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

Conservation of Momentum

Page 14: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

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

Conservation of Momentum

Page 15: 12.3 Newton’s Third Law of Motion and Momentum Newton’s Third Law Whenever one object exerts a force on a second object, the second object exerts an equal

12.3 Newton’s Third Law of Motion and Momentum

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

Conservation of Momentum

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