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Force and Motion

Force and Motion. What is a Force?. FORCE = Any push or pull which causes something to move or change its speed or direction. What is a Force?. Forces can be BALANCED or UNBALANCED Balanced forces are equal in size and opposite in direction

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Force and Motion

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  1. Force and Motion

  2. What is a Force? FORCE = Any push or pull which causes something to move or change its speed or direction

  3. What is a Force? Forces can be BALANCED or UNBALANCED • Balanced forces are equal in size and opposite in direction • Unbalanced forces are not equal in size and/or opposite in direction. If the forces on an object are UNBALANCED, we say a NET force results.

  4. What is a Force? Can you think of examples of forces? • Balanced Forces? • Unbalanced Forces?

  5. What is Gravity? GRAVITY: An attraction force between all masses • Newton’s universal law of gravitation: Every object in the universe exerts a gravitational attraction to all other objects in the universe • The amount of gravitational force depends upon the mass of the objects and the distance between the objects

  6. What is Gravity? • The greater the mass, the greater the force • The greater the distance, the less the force

  7. Weight is a measure of the gravitational force between two objects • The greater the mass the greater the force (weight) • Measured in units called Newtons (N)

  8. Weightlessness – free from the effects of gravity

  9. Air resistance: The force of air exerted on a falling object • The air pushes up as gravity pulls down • Dependent upon the shape and surface area of the object • Terminal velocity is the highest velocity that an object will reach as it falls

  10. What is Motion? Motion: A change in position of an object compared to a reference point Motion involves all of the following:

  11. What is Motion? = distance time

  12. What is Motion?

  13. What is Motion?

  14. What is Friction? Friction = A force that opposes or slows down motion • Caused by the physical contact between moving surfaces • The amount of friction depends upon the kinds of surfaces and the force pressing the surfaces together • Changes motion into heat

  15. What is Friction? What are some ways athletes uses friction?

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