The force which opposes an external force acting on a body while it is still at rest is called:

Normal reaction

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Kinetic friction

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Sliding friction

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Static friction

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Solution

The correct option is D
Static friction

When an external force acts on a block at rest, static friction opposes the relative motion between the surfaces. The body starts to move only when external force exceeds maximum static frictional force (also called limiting friction).

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The force which opposes an external force acting on a body while it is still at rest is called:

The correct option is D Static friction When an external force acts on a block at rest, static friction opposes the relative motion between the surfaces. The body starts to move only when external force exceeds maximum static frictional force (also called limiting friction).

The correct option is D
Static friction

When an external force acts on a block at rest, static friction opposes the relative motion between the surfaces. The body starts to move only when external force exceeds maximum static frictional force (also called limiting friction).