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Why does the box stop? F=MA

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**Friction is the force resisting the motion of objects sliding against each other.**

Box Surface Friction is a force!

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**Friction always apposes motion**

F=MA Friction Force Friction Force Friction always apposes motion

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**Three types of friction**

Static Friction Static means “no motion” Static friction is the friction force that prevents two surfaces at rest from sliding past each other. As you apply force, friction force increases Apply Force Friction Force When applied force is greater than friction force, the object begins to move

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**Three types of friction**

Sliding Friction Sliding friction is the friction force that opposes the motion of an object along a surface. Static friction is before an object moves Sliding friction is when the object is in motion

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**Three types of friction**

Rolling Friction Rolling friction is the friction force that opposes the motion of a circluar object along a surface.

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**Three types of friction**

> > Static Friction Sliding Friction Rolling Friction All friction opposes motion

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Equation 𝐹 𝑓𝑟𝑖𝑐𝑡𝑖𝑜𝑛 =𝜇∗𝑀∗𝑔

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**Newton’s First Law More Mass = More Inertia**

Also called: Newton’s Law of Inertia Inertia is the resistance to motion due to mass More Mass = More Inertia

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**Elephant has more inertia ‘**

Example Elephant has more inertia ‘ than a human Which means, it’s harder to change an elephant’s motion than a human’s motion.

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**More inertia, means more force to get it moving**

50 kg Force More Mass = More Inertia 100 kg 2 x Force More Inertia = More Resistance 150 kg 3 x Force

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Friction Force Depends on surface and shape of object Inertia Depends on mass of the object

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