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The diagram below represents a 10.-newton block sliding at constant speed down a plane that makes an angle of 30.° with the horizontal. The magnitude of the frictional force acting on the block is

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The magnitude of the frictional force acting on the block is 5 N.

How to calculate the magnitude of friction force?

The magnitude of the frictional force acting on the block is calculated as follows;

F(net) = ma

where;

  • m is mass
  • a is acceleration

Since the block is sliding at a constant speed, the acceleration = 0

F(net) = 0

- F(parall component of weight) - F(friction) = 0

- W sinθ - Fs = 0

Fs = - W sinθ

where;

  • W is the weight of the block
  • θ is the angle of inclination

Fs = -10 N x sin (30)

Fs = - 5 N

The magnitude of the force = 5 N

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