Exploring the Concept of Couples and Moments in Physics

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In summary, a couple is when two forces are equal, opposite, and parallel. However, if one force is bigger than the other, it can still be considered a couple as long as they are parallel. This concept is related to moments and can be shown through a force diagram. To determine if a couple is in equilibrium, the forces must be resolved horizontally and vertically. The strictness of the parallel requirement may depend on the angle.
  • #1
weedannycool
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Can anybody tell me what a couple is. From what i gather it is when two forces are equal, opposite and parallel.

But but if 1 force is bigger than the other say a 2 and a 3N force could it be said that there is a couple of 2N forces ?

Does it have anything to do with moments?
__________

Daniel
 
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  • #2


Draw yourself a force diagram showing what you have just described, with unequal forces.

Now resolve horizontally and vertically.

Does your diagram describe equilibrium?

Does that answer your question?
 
  • #3


so i suppose it depends on the angle? but don't they have to be strictly parallel?
 

1. What is a moment in physics?

A moment in physics refers to the turning effect produced by a force acting on an object. It is also known as torque and is measured in Newton-meters (Nm).

2. How is the moment of a force calculated?

The moment of a force is calculated by multiplying the magnitude of the force by the perpendicular distance from the pivot point to the line of action of the force. The formula for moment is M = Fd, where M is the moment, F is the force, and d is the distance.

3. What is the principle of moments?

The principle of moments states that for an object to be in equilibrium, the sum of clockwise moments must be equal to the sum of anticlockwise moments. This principle is used to solve problems involving moments and equilibrium.

4. How do moments affect rotational motion?

Moments play a crucial role in rotational motion as they determine the direction and speed of rotation. If the moments acting on an object are balanced, the object will not rotate. If the moments are unbalanced, the object will rotate in the direction of the greater moment.

5. What are some real-life examples of moments?

Some real-life examples of moments include turning a doorknob, opening a bottle cap, and using a wrench to loosen a bolt. In all of these scenarios, a force is applied at a distance from a pivot point, resulting in a turning effect or moment.

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