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Forces
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Slide 1

FORCES

FORCES

Is gravity real -

or does the Earth

just suck?

Slide 2

What do forces do?

What do forces do?

Make things ----

move

move faster

move slower

change direction

also

change shape

Slide 3

Big and Little forces

Big and Little forces

We can measure forces

Using a forcemeter

Slide 4

Sir Isaac Newton

Sir Isaac Newton

Slide 5

Which fruit ?

Which fruit ?

Slide 6

Newton?

Newton?

Slide 7

Gravity is a force

Gravity is a force

When gravity pulls something towards the Earth -

- we call this force the weight.

Slide 8

Forces are measured in Newtons

Forces are measured in Newtons

Weight of an apple = about 1 Newton

Slide 9

Lets play

Lets play

a game !

Slide 10

Results

Results

Slide 11

Forcemeters

Forcemeters

Slide 12

Now another game!

Now another game!

Slide 13

Lifting a ping pong ball

Lifting a ping pong ball

.

straw

Suck !

Slide 14

ping pong ball falling

ping pong ball falling

The arrow represents the force of gravity

Slide 15

The ball does not fall when your sucking force = force of gravity

The ball does not fall when your sucking force = force of gravity

How have I shown this ?

Slide 16

Which diagram shows the sucking force equal to the force of gravity?

Which diagram shows the sucking force equal to the force of gravity?

gravity

gravity

Slide 17

The ball does not fall when your upward force = force of gravity

The ball does not fall when your upward force = force of gravity

Slide 18

Gravity down under

Gravity down under

People do not fall off the Earth

Slide 19

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