Define the moment of a force.

State the formula used to calculate a moment, including the units for each quantity.

A force of 50 N is applied to the end of a spanner that is 0.4 m long. Calculate the moment produced.

State the Principle of Moments.

A 40 N weight is placed 2 m from the pivot of a seesaw. How far from the pivot on the other side must a 80 N weight be placed to balance it?

What is a "pivot" or "fulcrum"?

How could you increase the turning effect of a force applied to a spanner without increasing the force?

Define what a "couple of forces" is.

Give a real-world example of a couple of forces in action.

If an object is balanced, what can you say about the sum of clockwise moments compared to the sum of anticlockwise moments about its pivot?

The moment of a couple is calculated by multiplying one of the forces by what distance?

A boy applies a 10 N force at a distance of 1.5 m from a pivot. What is the clockwise moment he creates?

Why is the handle of a door placed at the edge, far from the hinges?

What is the unit of a moment?

A uniform rod is pivoted at its center. If two equal forces are applied at equal distances from the center on opposite sides, will the rod rotate?