Gravity and Other Forces

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Slide 1

FORCES

Is gravity real -

or does the Earth

just suck?

Slide 2

What do forces do?

Make things ----

move

move faster

move slower

change direction

also

change shape

Slide 3

Big and Little forces

We can measure forces

Using a forcemeter

Slide 4

Sir Isaac Newton

Slide 5

Which fruit ?

Slide 6

Newton

Slide 7

Gravity is a force

When gravity pulls something towards the Earth -

- we call this force the weight.

Slide 8

8

Forces are measured in Newtons

Weight of an apple = about 1 Newton

Slide 9

9

Let’s play

a game !

Slide 10

10

Results

Slide 11

Forcemeters

Slide 12

12

Now another game!

Slide 13

Lifting a ping pong ball

.

straw

Suck !

Slide 14

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

How have I shown this ?

Slide 16

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

Slide 18

Gravity down under

People do not fall off the Earth

Slide 19