# Balanced forcesPage 1

#### WATCH ALL SLIDES

Slide 1 Balanced Forces

Slide 2 ## Levers

Slide 3 ## Write out the statements that are true.

a The longer the lever, the bigger the force that is needed to move an object.

b It is easier to close a door if you push the door close to the hinge

c The shorter the lever, the bigger the force that is needed to move an object

d Joints are examples of pivots.

e Bones are examples of levers.

Slide 4 C, D and E

Slide 5 ## Learning Objective

To investigate, through practical experimentation, the principle of moments.

Slide 6 Slide 7 What do we need to record?

How many columns will we need in our table?

Slide 8 Slide 9 Slide 10 Weight and Mass

YouTube - Eureka! Episode 7 - Weight vs. Mass

YouTube - Eureka! Episode 6 - Gravity

Racing Balls

Slide 11 ## Write out each term along with its correct description

Descriptions

anticlockwise moments = clockwise moments

two boys of different weights sit opposite each other on a see saw, both the same distance from the pivot

the turning effect of a force

moment

balanced system

unbalanced system

Lever Principle

GCSE PHYSICS: Moments

Slide 12 ## Moment calculation

Gina weighs 500 N and stands on one end of a seesaw. She is 0.5 m from the pivot.

What moment does she exert?

moment = 500 x 0.5

= 250 Nm

Slide 13 ## Moment equation

The moment of a force is given by the equation:

Moments are measured in Newton centimetres (Ncm) or Newton metres (Nm).

Slide 14 ## Principle of moments

The girl on the right exerts a clockwise moment, which equals .

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