4.13 Moments (Part 1)

Question 1

What is a moment?

Answer 1

A rotational or turning effect of a force

Question 2

How can a moment occur?

Answer 2

If a resultant force acts on an object with a pivot (a fixed point about which the object can hinge) it can cause the object to rotate around the pivot - like pushing open a door on a hinge. This rotational (or turning) effect is called the moment of a force

Question 3

In the case of a spanner, what is the distance?

Answer 3

The perpendicular distance between the pivot and where the force is being applied

Question 4

The ________ the applied force or the ________ the force acts from the pivot, the larger the turning effect.

Answer 4

greater, further

Question 5

Without changing the force, how could you get a larger moment using a spanner?

Answer 5

By using a longer spanner, the same force can exert a larger moment because the distance from the pivot is greater.

Question 6

How do you get the maximum moment using a spanner?

Answer 6

You need to push at right angles (perpendicular) to the spanner

Question 7

What does the direction of the rotation depend on?

Answer 7

The direction of the force and which side of the pivot the force is on

Question 8

What is the formula for moment?

Answer 8

M = fd

Question 9

What are the units for moment?

Answer 9

Newton metres (Nm)

Question 10

In a balanced seesaw, the total clockwise moment is __________ the total anti-clockwise moment.

Answer 10

equal to