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Friction

Friction. Acts in direction of plane (i.e. up or down the table) Factors affecting friction Limiting friction F lim = R. Factors Affecting Friction. Mass of object Material of surface & object Area of contact Shape of contact Other forces (& others…). Limiting Friction.

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Friction

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  1. Friction • Acts in direction of plane (i.e. up or down the table) • Factors affecting friction • Limiting friction Flim = R

  2. Factors Affecting Friction • Mass of object • Material of surface & object • Area of contact • Shape of contact • Other forces (& others…)

  3. Limiting Friction • The amount of force required to overcome friction • There is a limit to the amount of friction between an object and a surface • Friction, or limiting friction, is largely dependent on mass of object Flim = R Normal reaction force ( mg) Amount of force required to overcome friction 0 ≤  ≤ 1 Coefficient of friction (all the other factors)

  4. More on friction • Friction is in direction opposite to motion (it opposes the force) • At point of movement the friction is ‘limiting’ (and in direction opposite to motion) • At point of movement F = R • Friction is always ≤ R (in case above friction is equal to R)

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