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**Newton’s Laws of Motion**

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The First Law of Motion Objects at rest will stay at rest and objects moving at a constant velocity will continue moving at a constant velocity.

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**WHAT??? WHY??? Objects at rest stay at rest.**

Objects in motion stay in motion. WHY??? A force must act on them to make them start or stop.

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**What forces change an objects motion?**

Friction Gravity A push or a pull

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**Inertia – the tendency for an object to stay at rest or in motion.**

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**The Second Law of Motion**

Acceleration (change in speed or direction) of an object depends on the object’s mass and on the net force acting on it. 10 N

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Calculating Force F= m x a a = F ÷ m

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**What is the net force on a 1,000-kg object accelerating at 3 m/s2?**

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**What net force is needed to accelerate a 25-kg cart at 14 m/s2?**

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Acceleration Increase Force OR Decrease Mass

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Acceleration Decrease Force OR Increase Mass

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**For every action there is an equal and opposite reaction**

The Third Law of Motion For every action there is an equal and opposite reaction 15 N 15 N

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**momentum – the product of an object’s mass and velocity**

momentum = mass x velocity

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**What is the momentum of a bird with a mass of 0.018kg flying at 15m/s?**

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**A golf ball travels at 16m/s, while a baseball moves at 7m/s**

A golf ball travels at 16m/s, while a baseball moves at 7m/s. The mass of the golf ball is 0.045kg and the mass of the baseball is 0.14kg. Which has the greater momentum?

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Law of Conservation of Momentum – in the absence of outside forces, the total momentum of objects that interact does not change.

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