Upward Force required to break static friction

In summary, the problem involves finding the upward force needed to make a pipe start to move, given a fixed point and a 36 inch shaft with a load of 1700lbs. Using an equilibrium equation, the force at which the shaft will start to rotate can be determined. The rolling friction coefficient is needed to find the angle at which the pipes will start to roll, but it is not provided in the problem.
  • #1
woodson111
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0

Homework Statement



What is the upward force required to make pipe start to move?

There is a fixed point and a 36 inch shaft. The force would be applied 36 inches away to the point. The load is 1700lbs. The end point only needs to come up enough so that the static friction of the pipe is broke so that they start to roll and will be close together.

Homework Equations


downward force= 1700lbs
static friction=.78 (not sure if this is right)


The Attempt at a Solution



n=1700lbs*9.8

Forceup=?
 
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  • #2
Welcome to PF! Unfortunately, your question is poorly phrased--a picture would surely be most helpful. Assuming you will provide that, do show the work you have done, so help can be provided, per PF rules.
 
  • #3
here is the only pic i have. from the little circles is the 36 inches. I just need enough upward lift and force so that the pipes start to move. Hope this better explains my problem.

Thanks
 

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  • #4
Use one of the equilibrium equations (which one?) to solve for the force at which the shaft will just start to rotate. Assume the pipes are equally spaced. The pipes will start to roll when rolling friction is exceeded, at an angle that is not being asked for, but which could be found if you knew the rolling friction coefficient. When the force is given in pounds, do not multiply by 9.8.
 
  • #5


To determine the upward force required to break the static friction and make the pipe start to move, we can use the equation F= μN, where F is the force required, μ is the coefficient of static friction, and N is the normal force. In this case, the normal force is equal to the weight of the load, which is 1700lbs. So, the equation becomes F=0.78*1700lbs=1326lbs. This means that an upward force of at least 1326lbs is required to break the static friction and make the pipe start to move. However, keep in mind that this is the minimum force required and it may take a slightly higher force to actually get the pipe to start rolling. Additionally, the distance of 36 inches from the fixed point may also affect the amount of force needed, as it will create a torque that must be overcome to break the static friction. Further experimentation may be needed to determine the exact amount of force required in this specific scenario.
 

1. What is static friction?

Static friction is a type of force that opposes the motion of an object at rest. It occurs when there is no relative motion between two surfaces in contact.

2. How is static friction different from kinetic friction?

Static friction only exists when an object is at rest, while kinetic friction occurs when an object is in motion. Additionally, the magnitude of static friction is typically greater than kinetic friction.

3. How is the upward force required to break static friction calculated?

The upward force required to break static friction, also known as the limiting friction, can be calculated using the formula: F = μN, where F is the force needed to overcome friction, μ is the coefficient of friction, and N is the normal force exerted by the surface on the object.

4. What factors affect the upward force required to break static friction?

The coefficient of friction, the weight of the object, and the surface area in contact are the main factors that affect the upward force required to break static friction. The roughness of the surfaces and the presence of any lubricants can also impact the amount of force needed.

5. How can the upward force required to break static friction be reduced?

The upward force required to break static friction can be reduced by decreasing the coefficient of friction, increasing the weight of the object, or increasing the surface area in contact. Additionally, using lubricants or making the surfaces smoother can also reduce the amount of force needed to overcome static friction.

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