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Welcome back minions!. Lots to do, so on, and so on, and so on…. What happens when…. Raining with a strong wind… Driving Home… A woodchuck with a bazooka jumps out… Slam on the brakes… Skid… Finally stop!. Friction. Friction :  - PowerPoint PPT Presentation

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Welcome back minions!

Welcome back minions!Lots to do, so on, and so on, and so onWhat happens whenRaining with a strong windDriving HomeA woodchuck with a bazooka jumps outSlam on the brakesSkidFinally stop!

FrictionFriction :A force that opposes motion between two surfaces that are touching.

For the force of friction to act between two objects, the objects must be touching.FrictionSliding Friction :Sliding Friction occurs when an object slides against a surface.

When you slide an eraser over a desk the eraser will travel for a short distance and then stop because of sliding friction.

FrictionRolling Friction :The friction between the wheels and the surface is called rolling friction.

When you push a shopping cart through a supermarket, the force of the cart pushing back on you results mainly from rolling friction.

FrictionFluid Friction :Fluid friction opposes the traveling of objects through a liquid or gas.

Fluids include: Liquids (water and milk) Gases (Air and helium) Bicycle racers bend low over their bikes in order to reduce the force of fluid friction.

FrictionStatic Friction :When a force is applied to an object and the object does not move static friction has occurred.

The object does not move because the force of static friction balances the force applied. Suppose you want to move a refrigerator. You push on the refrigerator, but it does not move. The refrigerator is pushing back on you with the force of static friction.

FrictionLubricants :Lubricants are substances applied to the surfaces of objects to help reduce friction between them. Lubricants include: Motor Oil, Wax, Grease

FrictionIncreasing Friction :Ways to increase friction might be making the surface rougher.

Examples: Sand scattered on icy roads to keep cars from skidding. A golfer wearing a glove to keep a good grip on the golf club.Riddle me thisFriction

1) Force that pulls an object towards the center of its mass.2) Force that causes a change in position.3) A force that repels electrons.4) A force that opposes motion between two surfaces that are touching.

Riddle me thisSliding Friction

1) When a force is applied to an object and the object does not move.2) Friction that opposes the traveling of objects through a liquid or gas. 3) The friction between the wheels and the surface.4) This occurs when an object slides against a surface.

Riddle me thisRolling Friction

1) When a force is applied to an object and the object does not move.2) Friction that opposes the traveling of objects through a liquid or gas.3) The friction between the wheels and the surface.4) This occurs when an object slides against a surface.

Riddle me thisFluid Friction

1) When a force is applied to an object and the object does not move.2) Friction that opposes the traveling of objects through a liquid or gas.3) The friction between the wheels and the surface.4) This occurs when an object slides against a surface.

Riddle me thisStatic Friction

1) When a force is applied to an object and the object does not move.2) Friction that opposes the traveling of objects through a liquid or gas.3) The friction between the wheels and the surface.4) This occurs when an object slides against a surface.

HomeworkTyped (not hand-written)Full name, Period, Date

Around your house, give me examples of:FrictionSliding FrictionFluid FrictionRolling FrictionStatic Friction