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# Gravity lesson

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• Teacher notes This presentation is aimed at KS2. Pupils should understand that: Gravity is the name Newton came up with to explain that all objects with mass attract each other. (He did a lovely equation too but we don’t need to know that!) We’re pulled to the centre of the Earth because its mass is much greater than ours. It is gravity that gives us our weight – and on the moon we weigh less (lass mass than Earth), on Jupiter (greater mass than Earth) we weigh more. Weight is measured in Newtons, (as all forces) and mass is mweasured in Kilos. Our position and orbit in the solar system is determined by gravitatonal pulls – the Sun has a huge mass (11x ours).
• Teacher notes: Talk about man on the moon – did he walk normally? (No) It was the gravity that made him so light. Why didn’t the space rocket ‘fly’ off too? (It’s mass was much greater than a man!) Going to the moon is one sure way to lose weight! You might want to go further and talk about walking on Jupiter (has a much greater mass) and gravitational pull is stronger, so walking would be impossible. We would be much heavier on Jupiter! We might look very different if our planet’s mass was much greater – we would have had to evolve to cope with a much stronger gravitational pull.. maybe we’d be short and squat!
• Teacher notes: Talk about man on the moon – did he walk normally? (No) It was the gravity that made him so light. Why didn’t the space rocket ‘fly’ off too? (It’s mass was much greater than a man!) Going to the moon is one sure way to lose weight! You might want to go further and talk about walking on Jupiter (has a much greater mass) and gravitational pull is stronger, so walking would be impossible. We would be much heavier on Jupiter! We might look very different if our planet’s mass was much greater – we would have had to evolve to cope with a much stronger gravitational pull.. maybe we’d be short and squat!
• Teacher notes: Talk about man on the moon – did he walk normally? (No) It was the gravity that made him so light. Why didn’t the space rocket ‘fly’ off too? (It’s mass was much greater than a man!) Going to the moon is one sure way to lose weight! You might want to go further and talk about walking on Jupiter (has a much greater mass) and gravitational pull is stronger, so walking would be impossible. We would be much heavier on Jupiter! We might look very different if our planet’s mass was much greater – we would have had to evolve to cope with a much stronger gravitational pull.. maybe we’d be short and squat!
• Teacher notes: Talk about man on the moon – did he walk normally? (No) It was the gravity that made him so light. Why didn’t the space rocket ‘fly’ off too? (It’s mass was much greater than a man!) Going to the moon is one sure way to lose weight! You might want to go further and talk about walking on Jupiter (has a much greater mass) and gravitational pull is stronger, so walking would be impossible. We would be much heavier on Jupiter! We might look very different if our planet’s mass was much greater – we would have had to evolve to cope with a much stronger gravitational pull.. maybe we’d be short and squat!
• Teacher Notes Although Newton and major scientists aren’t what we have to teach – it’s general knowledge. However, it’s also good to teach as another scientist (Einstein) did turn up in the 2006 SATs. Obviously, gravity wasn’t ‘discovered’ but it was Newton that formulated ideas and named it so. The apple story is not formally recorded and may be apocryphal, but it aids the memory nonetheless (and is fun).
• Teacher Notes Although Newton and major scientists aren’t what we have to teach – it’s general knowledge. However, it’s also good to teach as another scientist (Einstein) did turn up in the 2006 SATs. Obviously, gravity wasn’t ‘discovered’ but it was Newton that formulated ideas and named it so. The apple story is not formally recorded and may be apocryphal, but it aids the memory nonetheless (and is fun).

### Transcript

• 1. KS2 Science Forces Gravity: What goes up must come…. DOWNDOWN
• 2. What do you think will happen in this tug-of-war?
• 3. Gravity – what is it? • is an attractional force between objects. • Gravity acts on the Earth by pullingpulling objects towards its centre • Bigger objects have more gravity so since the Earth is bigger than everything on the Earth, everything is pulled towards the Earth!
• 4. Gravity – what is it? Which arrow is pointingWhich arrow is pointing thethe wrongwrong way?way?
• 5. Gravity – what is it? No, try again.No, try again.
• 6. Gravity – what is it? Yes, it’s this one
• 7. Who discovered it? • It was Sir Isaac Newton that ‘worked-out’ gravity. • 1643 – 1727 • He was the greatest English mathematician of his generation. His work on optics and gravitation make him one of the greatest scientists the world has known.
• 8. Who discovered it? The story goes that he was sitting under an apple tree and an apple fell onto his head. He went to to explore why it fell down and came up with a theory and mathematical equation.. He named it GRAVITY.
• 9. But what about gravity on different planets? http://www.bbc.co.uk/learningzone/clips/gravity-earth-jupiter- and-pluto/1599.html http://www.exploratorium.edu/ronh/weight/
• 10. But what about gravity on different planets? http://www.bbc.co.uk/learningzone/clips/gravity-earth-jupiter- and-pluto/1599.html http://www.exploratorium.edu/ronh/weight/