welcome back minions!
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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 PresentationTRANSCRIPT
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WELCOME BACK MINIONS!Lots to do, so on, and so on, and so on…
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WHAT HAPPENS WHEN…
• Raining with a strong wind…
• Driving Home…• A woodchuck with a
bazooka jumps out…• Slam on the brakes…• Skid…• Finally stop!
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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.
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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.
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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.
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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.
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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.
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FRICTION• Lubricants :
• Lubricants are substances applied to the surfaces of objects to help reduce friction between them. • Lubricants include: Motor Oil, Wax, Grease
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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.
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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.
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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.
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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.
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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.
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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.
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HOMEWORK…• Typed (not hand-written)• Full name, Period, Date
• Around your house, give me examples of:• Friction• Sliding Friction• Fluid Friction• Rolling Friction• Static Friction