Moment

Question 1

What is a moment?

Answer 1

Forces sometimes make object turn or rotate
The turning effect of a force is called a moment
(You create a moment with your fingers when you turn the tap)

Question 2

Examples of moment

Answer 2

Turning, twisting, rolling, tipping pushing a bike/box/wheel/tap/wheel/wheelbarrow.

Question 3

What is an example of a pivot?

Answer 3

This moment is trying to undo a nut. The point the spanned will turn around is called the pivot.

Question 4

Increase a moment..

Answer 4

If a nut is too stiff we could increase the size of the movement by:

a) using a longer spanner
b) applying a bigger force to the spanner.

Question 5

Decrease moment…

Answer 5

a) using a shorter spanner

b) applying less force

Question 6

Calculating a moment…

Answer 6

Equation:

Moment of a force = force x perpendicular distance force from pivot.

Question 7

How to balance moment (on a see saw)

Answer 7

If two equal and opposite moment is applied to an object there will be no turning; the moment is balanced.

Question 8

When balanced…

Answer 8

Clockwise moments = anti clockwise moments

Question 9

On a see-saw a boy is 400N and the girl on the opposite side is 300N. The distance from the pivot for the girl is 2m so how far is the big sitting from the pivot?

Answer 9

1.5m

300Nx2m (girl) = 400Nx???
600nm=400Nx???
600/400=1.5
???=1.5m

Question 10

What is moment measured in?

Answer 10

Newton meters = Nm