Question

A man attached a rope to a 30 kg box of books. He pulls with a force of 120 N at an angle of 60 with the horizontal. The kinetic friction is 33 N. Find the net force acting on the box.

Answer 1

`F_(net)=27N`

Step-by-step explanation:

The forces acting on the box are:

The x-component of the pulling force
`F_(x)` and the friction force
`F_(fr)`. We assume positive in the direction of the pulling force in the x-component.

`F_(net)=F_(x)-F_(fr)`

`F_(net)=Fcos(60)-F_(fr)`

`F_(net)=120cos(60)-33`

`F_(net)=27N`

I hope it helps you!