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Forces

Forces. Contact Forces . Non-Contact Forces. Friction Applied Normal Tension Spring Force. Gravity Electricity Magnetism. Gravity. Force that pulls objects toward each other Law of Universal Gravitation :

cooper-wilkerson
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Forces

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  1. Forces Contact Forces Non-Contact Forces • Friction • Applied • Normal • Tension • Spring Force • Gravity • Electricity • Magnetism

  2. Gravity • Force that pulls objects toward each other • Law of Universal Gravitation: • The force of gravity acts between all objects in the universe that have mass. • We are attracted toward Earth and Earth is attracted towards us. • our mass is very small

  3. Factors affecting Gravity • Mass • More mass – stronger the gravitational pull • Weight is greater on Jupiter than on Earth • Distance • Greater distance – less force 20 10

  4. Friction • Frictionis a force that opposes motion between two surfaces that are in contact. • When two surfaces are in contact, the microscopic hills and valleys of one surface stick to the tiny hills and valleys of the other surface. This contact causes friction.

  5. friction • Two factors that affect the force of friction are the types of surfaces involved and how hardthey are pushed together. • The rougher the surface – the greater the force • Sandpaper vs. Ice • The heavier the object – the greater the force of friction. • The harder the surfaces are pushed together, the stronger the force of friction.

  6. Friction – Friend or Foe? • With your table partner, discuss these four questions and come up with a list of at least three answers per question. Be ready to share with the class. • In what ways is friction helpful in the world? • In what ways is friction harmful? • What are some ways to reduce friction? • What are some ways to increase friction?

  7. Friend and foe • Friction can be both harmful and helpful, so it may be necessary to decrease or increase friction.

  8. Friction Increases Decreases • Rougher surface • Sand, gravel on ice • Increase the applied force • Use force when sanding • Lubricants • Oil, wax, grease • Rolling • Ball bearings • Smoother surface

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