I have a question on forces anyone help me

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    Forces
In summary, for a body to be in equilibrium, the vector sum of all forces acting upon it must equal 0 and the opposing forces must have the same line of action. Additionally, there must be zero net torque present. If a body is not in equilibrium, either the vector sum of forces does not equal 0 or there is nonzero net torque present.
  • #1

bettyboopxoxo143

what condition of forces must prevail for a body, acted upon by a number of forces:
1) to be equilibrium
2) not to be in equilibrium[?]
 
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  • #2
1) The vector sum of all forces must equal 0
2) The vector sum of all forces not 0
 
  • #3
Originally posted by bettyboopxoxo143
1) to be equilibrium

In addition to the "zero net force" condition, it also must be specified that opposing forces have the same line of action. Otherwise, you could have a force couple acting on an extended object. That would be zero net force, but a nonzero torque, which is not an equilibrium state.

An easy way to include this would be to add to Integral's answer:

1. ...and zero net torque.
2. ...or nonzero net torque.
 
  • #4


Originally posted by Tom
In addition to the "zero net force" condition, it also must be specified that opposing forces have the same line of action. Otherwise, you could have a force couple acting on an extended object. That would be zero net force, but a nonzero torque, which is not an equilibrium state.

An easy way to include this would be to add to Integral's answer:

1. ...and zero net torque.
2. ...or nonzero net torque.

Hi Jimmy/Tom,
Don't forget the dipolar loop induced magnetic force that is opposed and equal to the torque in a quantum orbital. Cheers, Jim
 

1. What is a force?

A force is a push or pull that can cause an object to accelerate or change its direction of motion. It is a vector quantity, meaning it has both magnitude and direction.

2. What are the different types of forces?

The four main types of forces are gravitational, electromagnetic, strong nuclear, and weak nuclear. Other examples include tension, friction, and normal force.

3. How do forces affect motion?

Forces can cause an object to start moving, stop moving, or change its direction. They can also affect the speed and acceleration of an object.

4. How do you calculate the net force on an object?

To calculate the net force on an object, you need to add up all the individual forces acting on that object. This is known as vector addition, where forces in the same direction are added and forces in opposite directions are subtracted.

5. How does Newton's laws of motion relate to forces?

Newton's laws of motion describe how forces affect the motion of objects. The first law states that an object will remain at rest or in motion at a constant velocity unless acted upon by a net force. The second law relates the net force to the acceleration of an object. And the third law states that for every action, there is an equal and opposite reaction.

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