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**Newton’s Second Law of Motion**

Chapter 6

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**Newton’s Second Law of Motion**

The net force acting on an object causes that object to accelerate in the direction of the net force. Greater the force = Greater acceleration. F F

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**Newton’s Second Law of Motion**

Inverse relationship between mass and acceleration!!! The greater the mass, the more force it takes to accelerate an object at the same rate of a less massive object!!! F F

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**Newton’s Second Law of Motion**

The relationship between force, mass, and acceleration is expressed as: F = ma SI unit = kg x m/s² = N

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Sample Problem What is the force of a baseball weighing 0.06 kg that is accelerating towards a wall at 5,500 m/s²? m = 0.06 kg a =5,500 m/s² F = ma = (0.06 kg x 5,500 m/s²) = 330 N

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**Newton’s Third Law of Motion**

Single isolated forces cannot exist! Forces always exist in pairs (action- reaction pair). “Whenever two objects interact, the force exerted on one object is equal in strength and opposite in direction to the force exerted on the other object.”

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**Force of the astronaut on the satellite**

Force of the satellite on the astronaut The most important thing to keep in mind about action-reaction pairs is that each force acts on a different object.

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**How does a nail get driven into a piece of wood by a hammer?**

Example 2: How does a nail get driven into a piece of wood by a hammer? Force of the nail on the hammer Force of the hammer on the nail Force of wood on nail

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Assignment Pg. 138 #1, 2, 3 & 5 Pg. 140 # 1, 2, & 4

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Objectives Define force as part of an interaction. (6.1)

Objectives Define force as part of an interaction. (6.1)

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