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**10-2: Friction, Gravity, & Elastic Forces**

What factors determine the strength of the friction force between two surfaces?

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**Why can he move an elephant with only his finger?**

Anticipatory Set Why can he move an elephant with only his finger?

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California Standards Science Standard 8.2.b: Students know when an object is subject to two or more forces at once, the result is the cumulative effect of all the forces. Science Standard 8.2.d: Students know how to identify separately the two or more forces that are acting on a single static object, including gravity, elastic forces due to tension or compression in matter and friction.

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Input friction: a force that two surfaces exert on each other when they rub against each other. static friction: the friction that acts on objects that are not moving. sliding friction: two solid surfaces slide over each other. rolling friction: an object rolls across a surface.

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**Input fluid friction: a solid object moves through a fluid.**

gravity: a force that pulls objects toward each other. mass: the measure of the amount of matter in an object weight: the gravitational force exerted on a person or object at the surface of a planet.

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**Input free fall: the only force acting on an object is gravity.**

air resistance: an upward force exerted on falling objects. projectile: an object that is thrown. compression: an elastic force that squeezes or pushes matter together. tension: an elastic force that stretches or pulls matter.

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**Input & Modeling Friction**

The strength of the force of friction depends on the types of surfaces involved and on how hard the surfaces push together. There are four types of friction…

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Input & Modeling Static Friction

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**Input & Modeling Sliding Friction**

Once the box is moving, there is sliding friction between the box and the floor.

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Input & Modeling Rolling Friction

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Input & Modeling Fluid Friction

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**Input & Modeling Gravity**

The force of gravity between objects increases with greater mass and decreases with greater distance. Weight = Mass x Acceleration due to gravity

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**Gravity Between Objects**

Input & Modeling Gravity Gravity Between Objects

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**Input & Modeling Gravity and Motion**

In free fall, the force of gravity alone causes an object to accelerate in the downward direction. free fall air resistance projectile motion

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Input & Modeling Projectile Motion Free Fall Air Resistance

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**Input & Modeling Elastic Forces**

Matter is considered elastic if it returns to its original shape after it is squeezed or stretched. Compression Tension

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**HOMEWORK CONNECTION Read pages 380-388 in your Science textbook.**

Complete the Section 10-2 Review & Reinforce Write a detailed SUMMARY of the section and complete the UNANSWERED QUESTIONS section of your notes. Choose two of the remaining Depth & Complexity ICONS in your notes and explain how they relate to this section.

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