Posted by **Mota** on Friday, January 29, 2010 at 6:17am.

A force of 100N pulls a box of weight 200N along a smooth horizontal surface makes 45(degree) to the floor .

Calculate the work done by the force.

A- in moving the box a distance of 25m along the horizontal.

B- against gravity.

C- against normal force.

- physics -
**Damon**, Friday, January 29, 2010 at 7:17am
Horizontal component = 100 cos 45 = 70.7

Work done by moving 25 m = 70.7*25 Joules

THE MOTION IS HORIZONTAL!!!

It does not move in the direction of gravity, thus zero

It likewise does not move in the direction of the normal force --> zero

This is a trick question intended to remind you that the work done is force IN THE DIRECTION OF MOTION times distance moved (also of course in the direction of motion)

## Answer This Question

## Related Questions

- physics - work 2 - A force of 100N pulls a box of weight 200N along a smooth ...
- physics - power(2) - A force of 100N pulls a box of weight 200N along a smooth ...
- physics - 1. A student is dragging a 5 kg box along the floor. He pulls on the ...
- Physics - A box is pulled along a level floor at a constant speed by a rope that...
- Physics - an 88kg cardboard box is being pulled along a level floor. the ...
- Physics - 1. Tyler pulls a box full of baby ferrets across the floor by means of...
- physics - Dirk pushes on a packing box with a horizontal force of 67.0 N as he ...
- Physics - Dirk pushes on a packing box with a horizontal force of 67.0 N as he ...
- Physics - Dirk pushes on a packing box with a horizontal force of 67.0 N as he ...
- Physics - 2. Tyler pulls a box full of baby ferrets across the floor by means of...

More Related Questions