The principle of moments states that, when an object is in equilibrium, the sum of anticlockwise moments about any point equals the sum of clockwise moments about the same point.

The moment of a force is the product of the force and the perpendicular distance between the axis of rotation and the line of action of the force.

- $\tau = r \times F$
- Unit of moment: Nm

A couple is a pair of forces, equal in magnitude but opposite in direction, whose lines of motion do not coincide.

- Will still rotate as there is a net moment
- As forces are equal and opposite, resultant force is zero and so there is no linear acceleration
- $\tau = r \times F$

Torque(Moment of a couple) is the product of one of the forces and the perpendicular distance between their lines of action of the forces.

- Can take moment from any point

Next: Equilibrium

Previous: Hooke’s Law

Back To Forces And Dynamics (A Level)

Akash scribbled

Wrong explained

Siyam scribbled

I think that it is 100N

Suraj kamate scribbled

How to score full makes in physics,biology , chemistry and maths in 12th std.

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I want to know physics and chemistry

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I wanted to know more about physics

apsara scribbled

two people are carrying a unifor wooden board that is 3m long and weighs 160N .if one person applies an upward force equal to 60N at one end,at what point does the other person lift?

Siyam scribbled

I think that it is 100N

kemegne isac scribbled

Good exercise

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give me the list of principles of moment

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newton’s laws of motion

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Newton’s first law of motion states that a body at rest or uniform acceleration remains at rest or uniform acceleration unless acted upon by an external force. This is the law Inertia

Newton’s Second Law Of Motion states that the force applied on an object is directly proportional to the change of Momentum.

Newton’s Third Law of motion states that action and reaction are equal and opposite in a closed system. This is the law of conservation of energy