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Standard VI

Physics

Kinetic Friction

A force of 20...

Question

A force of 20 N is applied on a block but it doesn't move. What is the frictional force on the block?

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Solution

Friction always acts opposite to the motion.
Static friction acts when a body is at rest and we try to move it on a rough surface.
Hence,

Since body stays at rest.
Hence, net force on body = 0
20 - friction = 0
Friction = 20N

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A force of 20 N is applied on a block but it doesn't move. What is the frictional force on the block?

Friction always acts opposite to the motion. Static friction acts when a body is at rest and we try to move it on a rough surface. Hence, Since body stays at rest. Hence, net force on body = 0 20 - friction = 0 Friction = 20N

Friction always acts opposite to the motion.
Static friction acts when a body is at rest and we try to move it on a rough surface.
Hence,

Since body stays at rest.
Hence, net force on body = 0
20 - friction = 0
Friction = 20N