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Friction

Friction. Friction Definition. Friction occurs when 2 objects are in contact with each other. The objects apply or exert a force on one another during this time. Friction acts in the opposite direction of motion – so it is the force that resists movement !. share.ehs.uen.org.

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Friction

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  1. Friction

  2. Friction Definition • Friction occurs when 2 objects are in contact with each other. The objects apply or exert a force on one another during this time. • Friction acts in the opposite direction of motion – so it is the force that resists movement! share.ehs.uen.org

  3. Factors that Affect Friction • How hard the surfaces push against each other – the more force, the higher the friction • The type of surfaces involved – the smoother the surface, the lower the friction www.waveequation.com

  4. Friction and Smooth Surfaces • Even apparently smooth surfaces actually have microscopic irregularities and bumps. When these come in contact with another surface friction occurs. www.mrteverett.com

  5. Direction of Friction • Friction acts in the opposite direction of motion, so if the object moves towards the right the frictional force will be towards the left. www.physics4kids.com

  6. Static Friction Definition: • The friction that occurs when objects are not moving. It is the friction that keeps objects in place. Example: • A box sitting on the ground, your books sitting on a table, your backside against the chair.

  7. How to “Overcome” Static Friction • The force needed to start an object moving must be greater than the static friction. • Reason why a greater force is needed to start an object moving than to continue it moving education-portal.com

  8. Sliding Friction Definition: • The friction that occurs when 2 solid objects move against each other (or 1 object moves over another) Example: • Bicycle brakes, skinning your knee, walking, writing

  9. Usefulness of Sliding Friction • It can keep you from slipping, sliding and falling (example: sand on an icy road)! www.goalvanise.com

  10. Rolling Friction Definition: • The friction that occurs when an object rolls across a surface. • Easier to overcome than sliding friction. Example: • Anything with wheels (cars, skateboards) or a ball rolling. www.school-for-champions.com

  11. Rolling Friction and Engineers • Engineers use ball bearings to reduce friction – the ball bearings roll between moving parts. news.thomasnet.com www.hartfordtechnologies.com

  12. Fluid Friction Definition: • The friction that occurs when a solid objects moves through a fluid. A fluid is a gas or liquid – they flow easily! • Easier to overcome than sliding friction. Example: • Anything moving through the air or water: riding a bike, surfing, swimming, sky diving

  13. Usefulness of Fluid Friction • Parts of machines move more easily when they are oiled. • Fluid friction is what slows down a skydiver when the parachute is opened.

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