England · Space physics · Unit SP-U1

Solar system and orbits

A proposed unit with 2 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

SP-U1 · Solar system and orbits

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SP-01 · SP-U1 · Planned

Solar system and cosmic scale

  • ScopeSeparate Physics
  • Difficulty2 / 4 · proposed
  • Time25–30 min · estimated
  • StatusPlanned

Learning objectives

Distinguish star, planet, dwarf planet, moon and artificial satellite; locate solar system within Milky Way.

8463 §§4.8.1.1,4.8.1.3 / No Trilogy counterpart

DfE single-science pp.44–45 · no Combined Space section. Evidence checked 30 September–1 October 2026. Skills: WS1.2,4.4; MS1b,2h,5b.

Needs firstFM-02,AT-09

Explanation

The solar system contains the Sun and bodies bound in its gravitational system, including planets, dwarf planets and satellites. It is a small part of the Milky Way. Navigable game models cannot simultaneously preserve realistic size and distance scales without carefully labelled separate views.

Concepts, equations and units: Sun, eight planets, dwarf planets, natural satellites; scale distances in m and standard form; no orbital-period equation required.

Prediction, demonstration and game exercise

Predict, observe, explain

Show nested scale views and flag all compressed distances/oversized planet depictions.

Planned learner game exercise

Place object/category cards and navigate a scale slider; compare orders of magnitude from supplied data.

Independent practice

Classify six objects and calculate two scale ratios; distinguish scale model from navigable scene.

Original practice example · Separate Physics

Is the Moon a planet, a natural satellite, an artificial satellite or a star?

Show working and model answer

Working / reasoning

It orbits Earth and was not built by humans.

Answer

A natural satellite.

Exit check and success criteria

Five classifications and one ratio correct; hierarchy system→galaxy clear.

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

Solar system equals galaxy; every orbiting object is a planet; rendered distance is physical astronomical distance.

Practical preparation

No RP; observational/model data.

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 →

SP-02 · SP-U1 · Planned

Gravity and stable orbits

  • ScopeSeparate Physics + Separate Physics Higher explanations
  • Difficulty3 / 4 · proposed
  • Time30–35 min · estimated
  • StatusPlanned

Learning objectives

Describe gravity-maintained planetary/satellite orbits; H explain changing velocity at constant speed and radius change for a different stable speed.

8463 §§4.8.1.3 / No Trilogy counterpart

DfE single-science pp.44–45 · no Combined Space section. Evidence checked 30 September–1 October 2026. Skills: WS1.2,3.6; MS5b.

Needs firstSP-01,FM-07,FM-11

Explanation

In the circular-orbit approximation, gravity supplies inward force while instantaneous velocity is tangent to the orbit. Higher explanations separate unchanged speed from changing velocity direction and require radius change for a different stable orbital speed in the same system.

Concepts, equations and units: Gravitational force directed inward; circular orbit approximation; H constant speed/changing direction; no centripetal-force/orbital-speed formula requirement.

Prediction, demonstration and game exercise

Predict, observe, explain

Freeze orbit positions and annotate inward force and tangential velocity; H compare two consistent stable orbits.

Planned learner game exercise

Predict motion if inward force removed; H choose model radius consistent with a supplied changed stable speed.

Independent practice

Annotated orbit explanation; H compare radius/speed cases qualitatively using model evidence.

Original practice example · Separate Physics Higher

A satellite moves at constant speed in a circular orbit. Is its velocity constant?

Show working and model answer

Working / reasoning

Its direction changes continuously even when speed stays fixed.

Answer

No; velocity changes direction, requiring inward acceleration/force.

Exit check and success criteria

Force points toward centre, velocity tangent; H changing direction and stable-radius condition 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

Gravity absent in orbit; inward force points along velocity; any chosen speed remains stable at fixed radius.

Practical preparation

No RP; analytical orbit model required, not Roblox engine default.

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.