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IWB

Web access

Construction materials

Digital camera

3 ropes (2 of which are securely fastened into the ground)

Resources

Drill key vocabulary of the different forces. Where else do you see these forces at work in daily life?

Children to experiment with building materials such as lego, mechano, art straws, balsa wood, natural materials from the school grounds etc.

As a group identify the different forces discussed in action – what are the consequences of these forces?

Storyboard in a digital photo sequence to display on wall for reference to during subsequent science work.

Web-based demo

www.constructionawards.org.uk

KS2 Activity 6 – the force a load exerts on a bridge IWB demo

Using the following website:

www.pbs.org/wgbh/buildingbig/lab/forces.html

Demonstrate the forces of: compression (squeezing), tension (stretching), bending, shearing (sliding), torsion (twisting)

Show a clip of ‘What the Victorians did for us’ which demonstrates the forces of a suspension bridge using people.

You could then go on to replicate this clip as a gym demonstration if you carry out a risk assessment first: The 2 pillar children hold onto a rope at either end which is well-secured into the ground. Another rope is used to span the distance between them. Another child is then used as a load on the bridge by sitting on the rope spanning between the two pillar children. The ‘pillar’ children should be able to experience the compressive force

pushing them down.

Contrast with what happens if the pillars are not connected to the anchored ropes (they’ll start to collapse in on each other).

*Health and safety consideration* make sure the load is light and ensure that the ropes either end are firmly secured to the ground.

What forces need to be considered in bridge design?

Plenary /

Assessment

Elli Based

Activity

Whole class teaching

Connecting Activity

Focus Question

ELLI

Curiosity

Meaning Making

Changing

Resilience

Strategic Awareness

Creativity

Learning Relationships

SUBJECT: Science / D.T.

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