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Balanced Forces

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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

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

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What do we need to record?

How many columns will we need in our table?

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Recording your results

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Weight and Mass

YouTube - Eureka! Episode 7 - Weight vs. Mass

YouTube - Eureka! Episode 6 - Gravity

Racing Balls

Slide 11

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

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

The moment of a force is given by the equation:

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

Slide 14

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

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- Levers
- Write out the statements that are true.
- Learning Objective
- Recording your results
- Write out each term along with its correct description
- Moment calculation
- Moment equation
- Principle of moments
- Principle of moments – calculation
- Why don’t cranes fall over?
- Crane operator activity

- Upcoming Classes
- Static and Kinetic Friction
- Newton’s third law of motion
- Newton's Laws
- Waves & Sound
- Thermal Energy
- Gravitation

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