Learning objective

Knowledge

  • To describe the relationship between lever length and effort.

Working scientifically

  • To draw an accurate line graph.

Success criteria

Knowledge

  • I can name the three things needed for

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National curriculum

Science

Forces

Pupils

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Before the lesson

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Lesson plan

Recap and recall

Arrange the class into pairs and display slide 1 of the Presentation: Spot the simple machine. Ask the pairs to spot and classify the simple machines (levers, pulleys and gears).

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Adaptive teaching

Pupils needing extra support

Could plot the model data found on slide 2 of the Presentation: Catapult line graph; could use the Knowledge organiser to help identify examples of simple machines in the Recap and recall and answer the questions about levers from the Attention grabber. 

Pupils working at greater depth

Should extrapolate the line on their graph to predict how far the marshmallow would travel with a lever of 14–16 centimetres; should estimate the missing data on the graph for levers with lengths of 1, 3, 5, 7, 9 and 11 centimetres; could choose an extension activity from the Resource: Stretch and challenge: Unbalanced forces.

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Assessing progress and understanding

Pupils with secure understanding indicated by: naming the three things needed for

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Knowledge outcomes

  • I can name the three things needed for a lever: effort, load and pivot.
  • I can list the uses of levers, including cutting, opening and lifting or moving.
  • I can explain that the farther the effort from the pivot (the longer the lever), the less effort is needed to lift the load.

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Vocabulary definitions

  • line graph

    A graph to show data that can have any value, using data points and a line of best fit.

  • line of best fit

    Used to show the link between the variable being changed and the variable being measured.

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