Solving a Uniform Beam Inclined at an Angle

In summary, the problem involves a uniform beam of mass m inclined at an angle θ to the horizontal. The beam is connected to a rope tied to a wall at its upper end (point P) and resting on a rough floor at its lower end. The coefficient of static friction between the beam and the floor is represented by μs, which is assumed to be less than the cotangent of θ. The problem requires finding the maximum mass M that can be suspended from the top of the beam before it slips, as well as determining the magnitude of the reaction force (R) at the floor and the force (F) exerted by the beam on the rope at P. The equations to be used are net torque = 0
  • #1
doneky
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Homework Statement


12-p-051.gif

A uniform beam of mass m is inclined at an angle θ to the horizontal. Its upper end (point P) produces a 90° bend in a very rough rope tied to a wall, and its lower end rests on a rough floor (see figure below). Let μs represent the coefficient of static friction between beam and floor. Assume μs is less than the cotangent of θ.
(a) Find an expression for the maximum mass M that can be suspended from the top before the beam slips. (Use any variable or symbol stated above along with the following as necessary: g.)
(b) Determine the magnitude of the reaction force (R) at the floor in terms of m, M, g, and μs.
(c) Determine the magnitude of the force (F) exerted by the beam on the rope at P in terms of m, M, g, and μs.

Homework Equations


Net torque = 0
Fnet = 0

The Attempt at a Solution


I have no clue where to start. Previous ones were easier, I just need to get started.
 
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  • #2
1. There are two weights that need to be kept static by vertically upwards forces. Where can those forces be applied to the system (or rope, weight and beam) by immovable objects (walls and/or floors)?
2. What is the vertical component of the force with which the beam pushes on the floor?
3. What is the horizontal component of the force with which the beam pushes on the floor?
 

Related to Solving a Uniform Beam Inclined at an Angle

1. What is a uniform beam inclined at an angle?

A uniform beam inclined at an angle is a type of physics problem that involves finding the forces acting on a beam that is angled relative to the ground. It is commonly used to study the effects of gravity and friction on an object.

2. How do you solve a uniform beam inclined at an angle?

To solve a uniform beam inclined at an angle, you will need to use principles of statics and trigonometry. First, identify all the forces acting on the beam, including the weight, normal force, and any other external forces. Then, use equations of equilibrium and trigonometric ratios to calculate the unknown forces and angles.

3. What are the key equations used to solve a uniform beam inclined at an angle?

The key equations used to solve a uniform beam inclined at an angle are the equations of equilibrium: ∑Fx = 0, ∑Fy = 0, and ∑M = 0. These equations represent the sum of all the forces and moments acting on the beam in both the horizontal and vertical directions.

4. What are some common mistakes to avoid when solving a uniform beam inclined at an angle?

Some common mistakes to avoid when solving a uniform beam inclined at an angle include forgetting to include all the forces acting on the beam, using the wrong trigonometric ratios, and misinterpreting the direction of forces. It is important to carefully label all forces and angles and double-check calculations to avoid errors.

5. How is solving a uniform beam inclined at an angle useful in real life?

Solving a uniform beam inclined at an angle is useful in real life in situations where an object is resting on an inclined surface, such as a ramp or a hill. It helps engineers and architects in designing structures and calculating the necessary forces to keep them stable. This concept is also important in understanding the mechanics of machines and vehicles that operate on inclined surfaces.

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