# physics

posted by .

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 -

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)

## Similar Questions

1. ### Physics

A child pushes a toy box 4.0m along the floor with a force of 6.00N directed downward at an angle of 37.0 degrees to the horizontal. a. How much work does the child do?
2. ### physics - work 2

A force of 100N pulls a box of weight 200N along a smooth horizontal surface (angle = 45) 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.
3. ### physics - power(2)

A force of 100N pulls a box of weight 200N along a smooth horizontal surface (angle 45) . Calculate the power of the applied force.
4. ### Physics

Dirk pushes on a packing box with a horizontal force of 67.0 N as he slides it along the floor. The average friction force acting on the box is 5.10 N. How much total work is done on the box in moving it 2.20 m along the floor?
5. ### Physics

Dirk pushes on a packing box with a horizontal force of 67.0 N as he slides it along the floor. The average friction force acting on the box is 5.10 N. How much total work is done on the box in moving it 2.20 m along the floor?
6. ### physics

Dirk pushes on a packing box with a horizontal force of 67.0 N as he slides it along the floor. The average friction force acting on the box is 3.00 N. How much total work is done on the box in moving it 3.10 m along the floor?
7. ### physics

1. A student is dragging a 5 kg box along the floor. He pulls on the rope with a 25 Newton force. The rope is 37 degrees above horizontal. As the box slides 10 meters, it goes from a speed of 3 m/s to a speed of 7 m/s. a.) calculate …
8. ### Physics

1. Tyler pulls a box full of baby ferrets across the floor by means of a rope that is tied to the box. The rope makes an angle of 41 degrees with the horizontal and tyler pulls on the rope with a force of 60N. a)What is the horizontal …
9. ### Physics

an 88kg cardboard box is being pulled along a level floor. the coefficient of static friction between the box and the floor is 0.23, and the sliding friction is 0.12. What is the weight of the box?
10. ### Physics

A box is pulled along a level floor at a constant speed by a rope that makes a 45 degree angle with the floor. The box weighs 100N. The coefficient of sliding friction is 0.75. The normal force exerted on the box by the floor is?

More Similar Questions