Circular motion and gravitation
What students will learn
Explain curved motion using real radial forces and connect gravitational fields with circular orbits.
Before this topic
- Newton’s laws and force diagrams
- Vector components and constant-speed motion
Read and connect
Read: Gravitational Force →
Connect inverse-square gravity, local field strength, real weight, and apparent weight.
Read: Circular Motion →
Distinguish radial from tangential acceleration and derive a circular-orbit period relation.
Supporting reading: Motion of Orbiting Satellites →
Return later to compare satellite energy and angular momentum in circular and elliptical orbits.
Before this connection: Potential energy and energy conservation; Angular momentum and angular impulse; Conservation of angular momentum.
Check understanding
Use the complete prompt to make student reasoning visible, then consult the separate worked reasoning and criteria. A reading completion tick records reading history.
Explain the near-surface gravity approximation →
Sketch the field against center distance and state the spatial limit of an approximately constant field.
Derive and graph an orbit relation →
Eliminate speed to obtain the period-radius relation and identify the slope with units.
The derivation assumes a gravity-only circular orbit around one central body.
Standards and earlier reading lists
These topic placements organize reading. Edition-qualified Standards mappings and the existing complete unit task sets retain their reviewed scope.