Concurrent Forces

Concurrent forces

| Concurrent forces, weight, tension, friction |

| Equilibrium Conditions |

| Problem Solution |

| Kinetic friction, Static friction, coefficients and laws of friction |

1.  

| Torque (moment), couple |

| Equilibrium Conditions: Force-Condition, torque-condition (principle of moments) |

| Center of mass, Center of Gravity, Arbitrary position of the axis  |

Information

1. Define the following terms?

| Concurrent forces: Are forces whose lines of action all pass through a common point. |

| Weight: is the force with which the gravity pulls downward upon it. |

| Tension in string: is the force with which the strings pulls upon the object to which it is attached. |

| Friction force: is a tangential force on a surface that opposes the sliding of a surface across an adjacent surface. |

| Normal force: is the perpendicular component of the force exerted by the supporting surface on the surface being supported. |

2. What are the equilibrium conditions under the action of concurrent forces?

The resultant of all forces acting on an object must be zero. or

1- The sum of all x-components is zero.

2- The sum of all y-components is zero.

3- The sum of all z-components is zero.

3. When an object is in equilibrium

If it is at rest and remains at rest. or if it is in motion with constant vector velocity

4. What are the types of equilibrium

Static-Equilibrium: The object it is at rest and remains at rest. 

Translational-Equilibrium: The object is in motion with constant vector velocity

5. How do you solve problems in equilibrium under concurrent forces?

1- Isolate the object under forces

2- Draw a free-body diagram

3- Find all the x,y,z-components of each force in the system

4- Write the conditions for equilibrium in an equation form

5- Solve for the unknowns from the equations obtained in step-4. 

6.  

Problems

1. The system shown below is in equilibrium. Solve for T1 and T2....