FORCE Friction occurs when two surfaces are in

FORCE

Friction occurs when two surfaces are in contact

When a liquid or gas is pushed out of the way of a moving object

When the grooves and ridges of a surface are in contact with the grooves and ridges of another surface, this produce friction. ie the interlocking between the two surfaces causes friction.

Roughness of Surfaces Weight of Objects

The amount of friction depends on how well the surfaces grip each other. Tyres on a road have very high friction (they don't slip), Skates on ice have very low friction (they slip easily).

For a solid object moving through a liquid or gas, the amount of friction depends on the shape and surface area of the objectand the viscosity (thickness ) of the liquid. The frictional force that fluids exerts on an object is called drag.

KINETIC STATIC AND

Is the friction between two moving surfaces

Static friction is the friction that exists between a stationary object and the surface on which it's resting.

Friction can be good. When we walk we push backwards against the ground, the opposing force pushes us forwards. Without friction our feet would slip and walking would be impossible.

To stop your bicycle (brake system)

Friction leads to wastage of energy. Friction leads to wear and tear.

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