# physics

posted by .

What is the minimum downward force on the box ( m=30 kg)that will keep it from slipping? The coefficients of static and kinetic friction between the box and the floor are 0.40 and 0.30, respectively.One person is pulling the box forward with a force of 125 N.

• physics -

The weight of the box PLUS the extra downward force F_d determines the maximum static friction force. This must balance or exceed the pulling force F_p if slipping is to be avoided.

0.40*(M g + F_d) = F_p

Solve for F_d

## Similar Questions

1. ### physics

What is the minimum downward force on the box in the figure that will keep it from slipping?
2. ### physics

Posted by norm on Monday, March 15, 2010 at 9:21am. What is the minimum downward force on the box in the figure that will keep it from slipping?
3. ### physics

What is the minimum downward force on the box in the figure that will keep it from slipping?
4. ### physics

A person pulls with a force of 40 N on two boxes at rest. The top box is 3.0 kg and the bottom box is 6.0 kg. The coefficient of kinetic friction between the floor and the larger box is .20 and the angle is 30 degrees. a) if the smaller …
5. ### physics

A person pulls with a force of 40 N on two boxes at rest. The top box is 3.0 kg and the bottom box is 6.0 kg. The coefficient of kinetic friction between the floor and the larger box is .20 and the angle is 30 degrees. a) if the smaller …
6. ### physics

box full of books rests on a wooden floor. The normal force the floor exerts on the box is 235 N. a) You push horizontally on the box with a force of 121 N, but it refuses to budge. What can you say about the coefficient of static …
7. ### physics

What is the minimum downward force on the box in the figure that will keep it from slipping?
8. ### biomechanic/physics

A person applies an 80-N pulling force 25 degrees counterclockwise with respect to the right horizontal to a 100-N box. The coefficient of static friction between the box and the floor is 0.85. Will the box slide?
9. ### Physics

A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 25o above the horizontal. The coefficients of static friction and kinetic friction between the box and wall are 0.21 …
10. ### Physics

A box is on a flat plane and has a force of 16 N applied downward to it at an angle of 55 degrees. The box has a mass of 28 kg. What is the minimum horizontal force F needed to make the box start moving in (Figure 1)?

More Similar Questions