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KS2 Science Forces Gravity: What goes up must come…. By Mrs Chapman, 2009 Mrs ChapmanMrs Chapman Greet Primary SchoolGreet Primary School, Birmingham.

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Presentation on theme: "KS2 Science Forces Gravity: What goes up must come…. By Mrs Chapman, 2009 Mrs ChapmanMrs Chapman Greet Primary SchoolGreet Primary School, Birmingham."— Presentation transcript:

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2 KS2 Science Forces Gravity: What goes up must come…. By Mrs Chapman, 2009 Mrs ChapmanMrs Chapman Greet Primary SchoolGreet Primary School, Birmingham Greet Primary School DOWN

3 Introduction Gravity – what is it?Gravity – what is it?Gravity – what is it?Gravity – what is it? Who discovered it?Who discovered it?Who discovered it?Who discovered it? How do we measure it?How do we measure it?How do we measure it?How do we measure it? Links for further studyLinks for further studyLinks for further studyLinks for further study QuizQuizQuiz Gravity – what is it?Gravity – what is it?Gravity – what is it?Gravity – what is it? Who discovered it?Who discovered it?Who discovered it?Who discovered it? How do we measure it?How do we measure it?How do we measure it?How do we measure it? Links for further studyLinks for further studyLinks for further studyLinks for further study QuizQuizQuiz

4 Gravity – what is it? is an attractional force between objects with mass. pullingGravity acts on the Earth by pulling objects towards its centre. Gravitational force is different on other planets because the gravitational force is dependent on the mass of the object. So, an object with heavier mass has a stronger gravitational pull = has a heavier weight. is an attractional force between objects with mass. pullingGravity acts on the Earth by pulling objects towards its centre. Gravitational force is different on other planets because the gravitational force is dependent on the mass of the object. So, an object with heavier mass has a stronger gravitational pull = has a heavier weight.

5 Gravity – what is it? Which arrow is pointing the wrong way?

6 Gravity – what is it? No, try again.

7 Gravity – what is it? Yes, it’s this one

8 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. 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.

9 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.

10 How do we measure it? We measure all forces in Newtons. The effect of gravity gives us our weight - so our weight should always be in Newtons. It is mass which is measured in kilograms. We measure all forces in Newtons. The effect of gravity gives us our weight - so our weight should always be in Newtons. It is mass which is measured in kilograms. Newtonmeter (also called Forcemeter, Spring balance, and Pullmeter)

11 Links for further study Which falls faster? learningzone video clip http://www.bbc.co.uk/learningzone/clips/1868.bb.wmv Travelling to Juipter.. Effects of gravity (learningzone video) http://www.bbc.co.uk/learningzone/clips/1599.nb.wmv Simple Flash animation by skoool..: (aimed at KS3) has voiceover (also a simulation and good quiz) http://lgfl.skoool.co.uk/viewdetails_ks3.aspx?id=376 Good explanations, some images, aimed at KS2: http://www.icteachers.co.uk/children/sats/gravity.htm A child-friendly site explaining gravity, uses pictures http://www.zephyrus.co.uk/gravity.html Some background on Sir Isaac Newton http://www.zephyrus.co.uk/isaacnewton.html

12 Quiz 1.Is gravity a push or a pull? Pull 2.Where is the gravitational pull strongest – the Earth or moon? The Earth 3.If we went to the moon, what measurement would change about us? Our weight – we would be lighter 4.Who discovered gravity? Sir Isaac Newton

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