Question

A 208.4 N force is pulling a 197 kg object across a horizontal surface.

The 208.4 N force acts at 32 degrees above the horizontal.
The coefficient of kinetic friction between the object and the surface is 0.455,
and the object is moved 161.5 m.

What work is done by the pulling force?
.
What work is done by kinetic friction?
.

Answer 1

Work done

• FscosØ
• 208.4(161.5)cos32
• 33656.6cos32
• 28542.4J

Work done by kinetic friction:-

• 
  `\mu_kN`
• 
  `\sf \mu_Kmg`
• 0.455(197)(9.8)
• 878.423N

Answer 2

The Work done is 28542.4J.

The work done by the kinetic friction is 878.423N

Given:

FscosØ

We put the values together.

208.4(161.5)cos32

33656.6cos32

28542.4J

Work done by kinetic friction:-

Given the formula, we put the values.

0.455(197)(9.8)

878.423N