What do you understand by friction? Draw a graph between applied force & frictional force and mark on it static friction, limiting friction and kinetic friction.

Friction is a force that opposes the relative motion or tendency of motion between two surfaces in contact. It occurs due to the interlocking of irregularities on the surfaces in contact. Friction can act in both static situations (where there is no relative motion between the surfaces) and kinetic situations (where there is relative motion).

The graph between applied force and frictional force can be divided into three regions representing different types of friction: static friction, limiting friction, and kinetic friction. Here's a description of each region and how they appear on the graph:

Static Friction: When an external force is applied to an object at rest, static friction initially opposes the applied force, preventing motion. The magnitude of static friction can vary up to a maximum value called the static frictional force. On the graph, the static frictional force increases linearly with the applied force until it reaches its maximum value.

Applied Force
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| / Static Friction
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| /________________________
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Limiting Friction: The limiting frictional force is the maximum value of static friction that can be overcome before motion starts. It is reached when the applied force exceeds the maximum static frictional force. Once the applied force exceeds this value, the object begins to move.

Applied Force
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| /
| /
| / Static Friction
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| /
| / Limiting Friction
|/
+------------------------------------------------

Kinetic Friction: When there is relative motion between the surfaces, the frictional force that opposes this motion is called kinetic friction. The magnitude of kinetic friction is generally less than the limiting frictional force. On the graph, once the object starts moving, the kinetic frictional force remains relatively constant as long as the applied force remains constant.

Applied Force
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| /
| /
| / Kinetic Friction
| /
| /
|/
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Please note that the shape and slope of the graph can vary depending on the specific materials and conditions involved. This graph provides a general representation of the relationship between applied force and frictional force.