Lesson 20 Friction and Gravity

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Presentation transcript:

Lesson 20 Friction and Gravity

Friction The force that two surfaces exert on each other when they rub against each other. Strength of friction How hard the surfaces push together Types of surfaces involved What is an example of friction?

Static Friction Sliding Friction Rolling Friction Fluid Friction Types of Friction Static Friction Sliding Friction Rolling Friction Fluid Friction

Static Friction Friction that acts on objects that are not moving Ex. Heavy treasure chest on floor

Sliding Fraction Occurs when two solid surfaces slide over each other Ex. Adding sand to an icy path to avoid slipping

Rolling Friction Occurs when objects roll across a surface Easier to overcome than sliding friction Ex. Anything that rolls over a surface

Fluid Friction Solid Object moves through fluid Ex. Surfboard on water

Read the article on friction Classwork Read the article on friction Answer the questions at the bottom (full sentences) Keep volume at a whisper

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