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FORCES

FORCES. (insert scary music here). I. Forces. A push or pull on an object. It is a vector All vector rules apply Measured in Newtons (N) Why? Named after Bob Newton. B. Contact Forces. When the applied force is touching the object. Friction Tension Wind Resistance.

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FORCES

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  1. FORCES (insert scary music here)

  2. I. Forces • A push or pull on an object. • It is a vector • All vector rules apply • Measured in Newtons (N) • Why? • Named after Bob Newton

  3. B. Contact Forces • When the applied force is touching the object. • Friction • Tension • Wind Resistance

  4. C. Field Forces • When a force is not touching. • Magnetism • Gravity • Electrical

  5. D. Free Body Diagram • A drawing of the forces acting on an object. • Ex. 2 student are pulling on a rope with 5 N of force each. 5 N 5 N

  6. N N E. Net Force • Net Force • Total force on an object • Use vector addition to find net force Fnet Ffriction Fpull W

  7. F. Balanced Force • Balanced Forces • forces acting on an object that are opposite in direction and equal in size • no change in velocity

  8. Example • Three Dogs fight over a toy. One pulls with 7 N E, one pulls 10 N W, and the other pulls with 4 N S. What is the net force on the toy? 7 N 10 N 4 N

  9. II. Newton’s 2nd Law • F=ma • F = force (N) • m = mass (kg) • a = acceleration (m/s2) • As force increases, acceleration increases. • The more massive something is the more force is required.

  10. Newton’s 2nd Law • If there is no net force, there is no acceleration. • If there is an unbalanced force, there must be an acceleration.

  11. B. Weight • Weight is the pull of gravity on an object. • Weight and mass are not the same thing. • Weight is a force • F = ma • a = 9.8 m/s2 only on Earth = g • So, W = mg • Calculate YOUR weight on Earth

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