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Forces and Friction

Forces and Friction. The weight of an object depends on the strength of gravity wherever the object is. The mass always stays the same. Weight. Weight force (N). Gravity (9.8 m/sec 2 ). F w = mg. Mass (kg). 6.1 Calculate weight.

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Forces and Friction

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  1. Forces and Friction

  2. The weight of an object depends on the strength of gravity wherever the object is. • The mass always stays the same.

  3. Weight Weight force (N) Gravity (9.8 m/sec2) Fw = mg Mass (kg)

  4. 6.1 Calculate weight • How much would a person who weighs 490 N (110 lbs) on Earth weigh on Jupiter? • The value of g at the top of Jupiter’s atmosphere is 23 N/kg. • (Since Jupiter may not actually have a surface, “on” means at the top of the atmosphere.)

  5. Calculate force • A 10-kilogram ball is supported at the end of a rope. How much force (tension) is in the rope?

  6. Friction • Friction results from relative motion between objects. • Frictional forces are forces that resist or oppose motion.

  7. Friction Normal force (N) Ff = m Fn Friction force (N) Coefficient of friction

  8. Calculate force of friction • A 10 N force pushes down on a box that weighs 100 N. • As the box is pushed horizontally, the coefficient of sliding friction is 0.25. • Determine the force of friction resisting the motion.

  9. Sliding Friction Normal force (N) Ff = msFn Friction force (N) Coefficient of sliding friction

  10. Table of friction coefficients

  11. Calculate using friction • The engine applies a forward force of 1,000 newtons to a 500-kg car. • Find the acceleration of the car if the coefficient of rolling friction is 0.07.

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