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Answer 1

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The correct answer is

Difference Between Kinetic and Static Friction

1) Definition of Kinetic and Static Friction

Kinetic Friction: The retarding force between two objects in contact that are moving against each other is called kinetic friction.

Static Friction: The force that has to be overcome in order to get something to move is called static friction.

2) Formula for Kinetic and Static Friction

Kinetic friction: The kinetic friction (fk) equals to fk = μkn, where μk is the coefficient of kinetic friction,  and n – the size of the normal contact force between the surfaces.

Static friction: The maximum static friction (fs max) equals to fsmax = μsn, where μs is the coefficient of static friction, and n – the size of the normal contact force between the surfaces.

3) Magnitude of Kinetic and Static Friction

Kinetic Friction: The force necessary to induce motion is always bigger than the one necessary to continue the motion. So the kinetic friction coefficient is smaller than the static friction one.

Static Friction: The coefficient of static friction exceeds the one of kinetic friction.

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