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**Motion and Forces Review**

Unit 5

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**Velocity Speed Velocity 50 Miles per hour 25 m/s 50 mph**

10 meters per second 50 miles per hour east 25 m/s towards home 50 mph left 10 meters per second up

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**Friction Occurs between all things in motion and contact**

Always opposes motion Static > Kinetic Rolling < Sliding Slows things down.

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Unbalanced Forces What would the result of forces on the box below be?

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**Newton’s 1st Law The law of inertia**

No change in motion will occur without an unbalanced force.

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Average Speed S= d/t

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**Inertia The tendency of an object to remain at rest or in motion**

Newton’s 1st Law Depends on an objects mass but not velocity More massive objects have more inertia

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**Gravity Fundamental force of nature**

Depends on mass of objects and distance between them. If Gravity decreases, weight decreases If Gravity decreases, mass remains the same

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**Newton’s 3rd Law Law of Action-Reaction Action Force = Reaction Force**

For every action there is an opposite and equal reaction.

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**Newton’s 2nd Law Force = mass x acceleration F=ma**

If a toy car is pushed with a 5 N force and has a mass of 10 kg what will it’s acceleration be?

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Momentum Momentum= mass x velocity p=mv

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Effect of forces

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