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10-2: Friction, Gravity, & Elastic Forces

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Presentation on theme: "10-2: Friction, Gravity, & Elastic Forces"— Presentation transcript:

1 10-2: Friction, Gravity, & Elastic Forces
What factors determine the strength of the friction force between two surfaces?

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

3 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.

4 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.

5 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.

6 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.

7 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…

8 Input & Modeling Static Friction

9 Input & Modeling Sliding Friction
Once the box is moving, there is sliding friction between the box and the floor.

10 Input & Modeling Rolling Friction

11 Input & Modeling Fluid Friction

12 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

13 Gravity Between Objects
Input & Modeling Gravity Gravity Between Objects

14 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

15 Input & Modeling Projectile Motion Free Fall Air Resistance

16 Input & Modeling Elastic Forces
Matter is considered elastic if it returns to its original shape after it is squeezed or stretched. Compression Tension

17 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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