FORCES Is gravity real - or does the Earth just suck?

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FORCES Is gravity real - or does the Earth just suck?

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Presentation transcript:

FORCES Is gravity real - or does the Earth just suck?

What do forces do? Make things ---- move move faster move slower change direction also change shape 3

Big and little forces 4 We can measure forces using a forcemeter

Sir Isaac Newton 5

Which fruit ? 6

Newton? 7

Gravity is a force When gravity pulls something towards the Earth - - we call this force the weight. 8

Forces are measured in newtons Weight of an apple = about 1 newton 9

10 Let’s play a game !

Results Measurement in newtons A B C Predicted Real 11

Now another game! 12

Lifting a ping pong ball. 13 straw Suck !

ping pong ball falling The arrow represents the force of gravity 14

The ball does not fall when your upward force = force of gravity 15 straw suck gravity How have I shown this ?

Which diagram shows the upward force equal to the force of gravity? 16 straw suck gravity straw suck gravity straw suck gravity

The ball does not fall when your upward force = force of gravity 17 straw suck gravity

Gravity down under People do not fall off the Earth 18

two objects dropped at the same time 19

On the Moon – Apollo A heavy geological hammer and a falcon feather were dropped from the same height. They hit the lunar surface at the same time. astronaut David Scott

Hippo jump 21

Hippo jump 22 force of gravity

Saved? 23

Hippo is still falling quickly 24

Hippo is still falling quickly but not getting faster How do we know? 25 force of gravity air resistance

How can we slow Hippo down? What can you change? 26

Launching a satellite The cannon ball must move very quickly to orbit the earth. The Moon orbits the Earth. 27

The Moon 28 The Earth

The Moon 29 The Earth

Very heavy boots- why? Answers? No gravity on the Moon Weightless on the Moon To stop them floating away They weigh very much less than on Earth To stop huge bounces The Moon’s gravity is very much less than the Earth’s gravity 30

GRAVITY Things fall Things have weight Things stay in place 31

No Gravity Would an apple fall? Would things stay on earth? What would happen? What? Why? How? Keep asking questions -like Newton! 32