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Q.

The unit in which frictional force can be measured is joule, pascal, watt, or newton?

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Detailed Solution

Frictional force is a type of contact force that resists the relative motion of two surfaces in contact. To answer the question, the correct unit to measure frictional force is newton (N).

Let us analyze why:

  • Newton (N) is the SI unit of force. Since friction is a force, it must be measured in newtons.
  • Joule (J) is a unit of energy or work, not force.
  • Pascal (Pa) is a unit of pressure (force per unit area).
  • Watt (W) is a unit of power (rate of doing work).

Frictional force comes into play when two surfaces are in contact and either slide or try to slide across each other. For example, when you try to push a heavy box on the floor, the force that resists your motion is friction. If you push with a force of 20 N, and the box does not move until then, it means the static friction is also 20 N (equal and opposite).

The magnitude of frictional force, in terms of formula, is: F = μN

Where: μ = coefficient of friction (dimensionless), N = normal reaction force (in newtons).

Since N is in newtons, the resulting frictional force is also measured in newtons.

Thus, the correct answer is that frictional force is measured in newtons, because it belongs to the family of forces, and force is universally measured in this unit.

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