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Getting the balance right
video
vocabul
ary
pivotn. the central
point, pin, or shaft on which a mechanism turns or oscillates
see-saw
n.
a long board that children play on. The board is balanced on a central point.
level
adj. having a flat, horizontal surface
balancen.a state wher
e things are of equal weight or force
distance
n. the amount of space between two places
MOMENTS
MOMENTS
Forces can make objects turn if there is a pivot. Think of a playground see-saw. The pivot is the thing in the middle of it.
When no-one is on the see-saw it is level, but it tips up if someone gets onto one end. Turning forces around a pivot
are called moments.
It is possible to balance the see-saw again if someone else gets onto the
other end and sits in the correct place. This is because the turning forces are balanced. We say the
moments are equal and opposite.
To work out a moment, we need to know two things:
1. the distance from the pivot that the force is applied.
2. the size of the force applied
This is the equation for working out a moment:
moment = force × distance
Getting the balance
right
You will get these following things,,,- string- chopsticks- things for
hanging - tape
Use those things to make mobiles that balance and hang properly