Work Based BA PTE Year 2 Science in the Primary Years
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Work Based BA PTE Year 2
Science in the Primary Years
Unit 5 Session 1Forces 1
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Learning objective:
•To deepen personal understanding about the nature of forces
National CurriculumSee unit notes
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Brainstorm:
What do you understand by the word ‘force’?
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A force is:A force is:
• a push
or• a pull
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How can a large cardboard box and a small student assist in the teaching of forces?
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What forces are acting on the student?
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gravity
Why does she not move down through the floor if gravity is pulling her down?
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Gravity
Contact force
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Gravity
Contact force
Push!
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Gravity
Contact force
Push!
Friction
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Some key ideas
A force is measured in:
ons s
Newtons!
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Forces have effects in different directions
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Forces can be added
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gravity
Contact force
Push
Forces can balance
Push
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A force is a vectorA force is a vector
It has:• size
and • direction
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Spend 5 minutes on each of the 2 activities on the handout:
1. Feeling and measuring forces (in pairs)2. Heave Ho! Adding forces together (in a group of 6ish)
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Contact forces and non-contact forces
• Read Summary of Scientific Ideas on Forces
Unit notes pp 3-11
There are only a few different types of forces:• gravitational• electric• magnetic (related to electric)• strong nuclear• weak nuclear
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Every movement that starts or stops requires a force.
Three common forces are:• gravity (weight)
• contact force (reaction force)• friction
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Circus of 4 activities – see handouts
• Contact Force 1• Contact Force 2• Friction 1• The cause of friction
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Weight (gravity)
Contact force
Forces can balance
Summary of key points
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What does this show?
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The contact force with a surface is caused byspringy atoms
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push
friction
Friction
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Resistance due to distortion of bristles
A rather sad comb!
What causes friction?
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Analogous to two surfaces in contact
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Why don’t the Australians drop off?
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What causes gravity?
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‘The core is like a big magnet.’
‘Is it because the world is spinning?’
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Mass attracts mass
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Sorry…no excuse
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‘Pencils produce gravity but not enough to attract anything.’
‘If you push the two books out in a space craft, in a few days they would gradually pull together…where there’s no friction.’
‘It’s a force that pulls things to the centre of the earth.’ ‘It makes things fall’
‘It causes the tide to come in.’
‘I think it’s a force that grows in outer space and it picks up rubble and pulls it together.’
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Concept cartoon 11.6
Discuss skateboard example
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Required Reading:• Johnsey et al. (2002) Chapter 9 • Sharp et al. (2002) pp.91-92
Also:
Explore/read the Handout – plenty of useful information!