WELCOME BACK MINIONS! Lots to do, so on, and so on, and so on…

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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 : 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.

FRICTION Sliding 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.

FRICTION Rolling 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.

FRICTION Fluid 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.

FRICTION Static 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.

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

FRICTION Increasing 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 THIS… Friction 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 THIS… Sliding 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 THIS… Rolling 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 THIS… Fluid 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 THIS… Static 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.

HOMEWORK… CUBE Activity (Good idea to draw first, then assemble later!) A cube has 6 sides, so here is what you need to draw: 1 side = Name (First and Last CLEARLY PRINTED) 1 side = Definition of Friction 1 side = drawing of Sliding Friction 1 side = drawing of Fluid Friction 1 side = drawing of Rolling Friction 1 side = drawing of Static Friction Due Tuesday, March 17 th !

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