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Force

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Transcript

  • 1. Section 2 Force
  • 2. Force – push or pull
    • a force always acts in a certain direction
      • ex. if you push something, the force is in the direction of the push
  • 3. Forces in Nature
    • Electric force
      • ex. lightning
    • Magnetic force
      • ex. magnetic poles
  • 4.
    • Weight is a force
  • 5. Newton
    • Unit used for force (N)
  • 6. Net force
    • The combination of all the forces acting on an object.
    • How do you determine the net force of an object if all forces act on the same direction.
    • The answer depends on the directions of the forces
  • 7. Ballanced and unbalanced forces
    • When the forces on an object produce a net force of 0 N, the forces are balanced.
    • Balanced forces do not cause a nonmoving object to start moving.
    • When the net force on an object is NOT 0 N, the forces on the object are unbalanced.
    • Unbalanced forces are necessary to cause a nonmoving object to strat moving.
  • 8. What is friction?
    • Friction
      • force that opposes the motion of an object
        • the force of friction works in the opposite direction of the force of motion
  • 9. Friction occurs because the surface of any object is rough
    • The amount of friction between two surfaces depends on many factors.
    • Two factors include the force pushing the surfaces together and the roughness of the surfaces.
  • 10. Types of Friction
    • Kinetic Friction
      • The word kinetic means “moving” , friction between moving surfaces
      • In which of the two pictures friction is smaller?
  • 11. Static Friction
      • When a force is applied to an object but does no cause the object to move.
      • The word static means ……….
  • 12. CLASSWORK
    • IN YOUR OWN WORDS, WRITE A DEFINITION FOR THE TERMS FRICTION AND FORCE.
    • LIST THREE FORCES YOU EXCERT WHEN RIDING A BICYCLE.
    • EXPLAIN HOW FRICTION CAN BE HARMFUL AND HELPFUL.
    • EXPLAIN WHY FRICTION OCCURS.
    • NAME TWO WAYS IN WHICH FRICTION CAN BE INCREASED.
    • LIST THREE COMMON LUBRICANTS.
    • NAME SOME WAYS TO REDUCE FRICTION.
    • MAKE AN ILLUSTRATION EXPLAINING WHAT KIND OF FRICTION IS BEING APPLIED.
  • 13.
    • THANK YOU