Question

A constant horizontal pull of 8.70 N drags a box along a horizontal floor through a distance of 17.3 m .

Part A: How much work does the pull do on the box? W = ? J

Part B Suppose that the same pull is exerted at an angle above the horizontal. If this pull now does 52.0 J of work on the box while pulling it through the same distance, what angle does the force make with the horizontal? Angle = ?

Answer 1

Solution:

A) Given,

Force

Distance moved

The workdone by the force on the box is given by,

  

Here, the displacement is in the direction of force,. So, .

Thus,

  

The workdone is 150.5J.

B) Given, workdone

force

distance travelled

Let the angle made by force with the horizontal be .

Thus,

  

  

The angle is .