England · Forces and motion · Unit FM-U6

Moments and fluids

A proposed unit with 3 lectures, independent practice and a unit assessment.

Unit scope

Filters show lectures with relevant core content. Mixed lectures retain clearly labelled Higher/separate extensions; those extensions are not required on other routes. Difficulty is a design rating, not a GCSE grade.

Lectures

FM-U6 · Moments and fluids

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FM-16 · FM-U6 · Planned

Moments, levers and gears

  • ScopeSeparate Physics
  • Difficulty3 / 4 · proposed
  • Time30–35 min · estimated
  • StatusPlanned

Learning objectives

Calculate moments and balanced loads; explain levers and gears as transmitting turning effects.

8463 §§4.5.4 / No Trilogy counterpart

DfE single-science pp.35–37 / Combined pp.30–32. Evidence checked 30 September–1 October 2026. Skills: WS1.2,1.4; MS3b,3c,5a.

Needs firstFM-02,FM-03

Explanation

A moment depends on perpendicular distance from the pivot to the force’s line of action. Balanced clockwise and anticlockwise totals give rotational equilibrium. Levers and gears transmit turning effects; they cannot multiply energy.

Concepts, equations and units: M=Fd_perpendicular; N m; clockwise total=anticlockwise total at rotational equilibrium.

Prediction, demonstration and game exercise

Predict, observe, explain

Balance a beam, vary perpendicular distance and compare two gear trains; make clear no energy multiplication.

Planned learner game exercise

Position weights on a crane arm; select a lever/gear arrangement to meet a torque requirement.

Independent practice

Three moment/balance problems and one gears explanation; no advanced torque-speed equation required.

Original practice example · Separate Physics

A 20 N force acts 0.30 m perpendicular from a pivot. Find its moment.

Show working and model answer

Working / reasoning

M = Fd = 20 × 0.30.

Answer

6.0 N m.

Exit check and success criteria

Two correct balances, perpendicular lever arm identified and gear transmission explained.

During practice, compare the prediction with evidence and give an error-specific prompt. The exit item uses a fresh context or fresh values, answered independently.

Misconceptions, practical links and mastery

Check these misconceptions

Use distance along a sloping handle; moment measured in J because dimensions match work; gears create energy.

Practical preparation

Optional moments investigation, AT1,2.

Virtual preparation and revision only. Required hands-on activities and school records remain separate.

Proposed mastery

0: not yet evidenced. 1: supported. 2: independent exit criteria met. 3: successful changed-context transfer. Advance at 2; revisit with fresh retrieval. These are not GCSE grades.

Full lecture page →

FM-17 · FM-U6 · Planned

Fluid and atmospheric pressure

  • ScopeSeparate Physics
  • Difficulty3 / 4 · proposed
  • Time30–35 min · estimated
  • StatusPlanned

Learning objectives

Calculate normal-force pressure; explain atmospheric-pressure change with altitude.

8463 §§4.5.5.1.1,4.5.5.2 / No Trilogy counterpart

DfE single-science pp.35–37 / Combined pp.30–32. Evidence checked 30 September–1 October 2026. Skills: WS1.2,4.5; MS3b,3c,5c.

Needs firstFM-02; PM-01,PM-05 before this branch

Explanation

Fluid pressure produces forces normal to surfaces. Atmospheric pressure comes from air-particle collisions and decreases with altitude as there is less air above and lower density. Area conversions need squared units.

Concepts, equations and units: p=F/A; Pa=N/m²; F normal in N; A in m²; atmosphere particle model.

Prediction, demonstration and game exercise

Predict, observe, explain

Compare contact areas and pressure gauges in a gas/liquid; ascend a model atmosphere with density labels.

Planned learner game exercise

Choose support-foot areas for a load; match altitude measurements to a particle explanation.

Independent practice

Three area-conversion pressure problems and a four-step altitude explanation.

Original practice example · Separate Physics

A normal force of 100 N acts over 0.020 m². Find pressure.

Show working and model answer

Working / reasoning

p = F/A = 100/0.020.

Answer

5000 Pa.

Exit check and success criteria

Two correct calculations and lower pressure linked to fewer particles/less air above.

During practice, compare the prediction with evidence and give an error-specific prompt. The exit item uses a fresh context or fresh values, answered independently.

Misconceptions, practical links and mastery

Check these misconceptions

Pressure acts only downwards; air has no mass; convert cm² as if it were cm.

Practical preparation

Optional pressure demonstrations, AT1,2; no pressure-vessel handling in game instructions.

Virtual preparation and revision only. Required hands-on activities and school records remain separate.

Proposed mastery

0: not yet evidenced. 1: supported. 2: independent exit criteria met. 3: successful changed-context transfer. Advance at 2; revisit with fresh retrieval. These are not GCSE grades.

Full lecture page →

FM-18 · FM-U6 · Planned

Liquid depth, upthrust, floating and sinking

  • ScopeSeparate Physics Higher
  • Difficulty4 / 4 · proposed
  • Time35–40 min · estimated
  • StatusPlanned

Learning objectives

Calculate liquid pressure changes; explain upthrust and buoyancy using pressure differences.

8463 §§4.5.5.1.2 / No Trilogy counterpart

DfE single-science pp.35–37 / Combined pp.30–32. Evidence checked 30 September–1 October 2026. Skills: WS1.2,3.6; MS3b,3c,4a.

Needs firstFM-17,PM-01

Explanation

Greater liquid depth means a taller liquid column above a point. A submerged body therefore has greater pressure beneath than above, producing upthrust. Floating equilibrium requires upthrust to balance weight; it does not remove gravity.

Concepts, equations and units: p=hρg for pressure due to liquid column; Pa, m, kg/m³, N/kg; upthrust N; total pressure may include atmosphere.

Prediction, demonstration and game exercise

Predict, observe, explain

Place pressure sensors at several depths and on upper/lower faces of a block.

Planned learner game exercise

Choose a vessel and cargo density to float; reconcile upward/downward forces and depth data.

Independent practice

Two pressure-difference calculations and annotated floating/sinking explanations.

Original practice example · Separate Physics Higher

Find water-column pressure 2.0 m deep using ρ = 1000 kg/m³ and g = 10 N/kg, excluding atmosphere.

Show working and model answer

Working / reasoning

p = hρg = 2.0 × 1000 × 10.

Answer

20,000 Pa due to the water column.

Exit check and success criteria

Both values correct and upward resultant linked to greater pressure below; floating force balance correct.

During practice, compare the prediction with evidence and give an error-specific prompt. The exit item uses a fresh context or fresh values, answered independently.

Misconceptions, practical links and mastery

Check these misconceptions

Use total pressure as liquid-only contribution; floating requires no weight; larger density always means larger upthrust independent of displaced volume.

Practical preparation

Optional flotation/pressure-column demonstration.

Virtual preparation and revision only. Required hands-on activities and school records remain separate.

Proposed mastery

0: not yet evidenced. 1: supported. 2: independent exit criteria met. 3: successful changed-context transfer. Advance at 2; revisit with fresh retrieval. These are not GCSE grades.

Full lecture page →

Area capstone

Sources and full programme

Sources checked 30 September–1 October 2026. Specifications govern content; textbooks supplement it. England has no single prescribed Physics course book. The full planning document includes sourced comparisons of Collins separate Physics and Trilogy books, Hodder/Hachette Physics and Oxford Physics listings, with access/approval limitations.

Download the complete Markdown programme and coverage matrix

A subsection map is proposed coverage. Clause-level educator review, item moderation, model validation and hands-on provision remain release gates. No all-board alignment or exam-board endorsement is claimed.