PracticeQuestionsYears 1–7
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Forces and motion

Year 7 bridging · Year 7 bridging · Y5 F — Gravity, air resistance, water resistance and friction

Draft — awaiting teacher review

Builds on: Gravity, friction and air resistance (Year 5)

I

Concept Anchor

Balanced forces cause no change in motion. Unbalanced forces cause an object to speed up, slow down or change direction. The resultant force is the overall force.

Worked example

A box is pushed right with 30 N while friction acts left with 12 N.

  1. 1.Forces act in opposite directions, so subtract.
  2. 2.30−12=1830 - 12 = 18.
  3. 3.Resultant: 1818 N to the right.
  4. 4.The box speeds up to the right.
II

Guided Check

A skydiver falls at a steady speed. Compare air resistance and weight.

    III

    Independent Diagnostic Practice

    Q1Year 7 bridgingY5 F — Friction·Fluency·●○○Draft — awaiting teacher review

    What is the unit of force?

    Q2Year 7 bridgingKS3 Forces — Resultant force·Reasoning·●●○Draft — awaiting teacher review

    A boat is pushed forward with 500 N; water resistance is 500 N. What happens?

    Q3Year 7 bridgingY5 F — Gravity and mass·Problem Solving·●●●Draft — awaiting teacher review

    An astronaut goes from Earth to the Moon. What changes?