Question

The weight of a body is 130 N and is at rest on a horizontal plane. A horizontal force of 100 N will just cause it to slide. Determine the coefficient of friction​

Answer 1

Answer:

See below.

Explanation:

The weight W of the body is,

$W = 130 \ N$

The force F required to just slide the body,

$F = 100 \ N$

The frictional force is given by,

$f = \mu N$

Where N is the Normal reaction and mu is the coefficient of friction. In this case, the normal reaction equals the weight of the body. So, the frictional force is given by,

$f = \mu \ W$

When the body is about to slide, the external force F equals this frictional force,

$f = F \\\mu \ W = F\\\mu \times 130 = 100\\\mu = 0.77$

Which gives the final answer.