Science
Space Systems & Earth's History
Conceptual
12–13 yrs
Universal Gravitation
万有引力
Description
Describe gravity as a universal attractive force between all masses, explain that orbital motion arises because gravity provides the centripetal force keeping objects in orbit, and compare gravitational field strengths on different planets
Mastery Evidence
- States that gravity is a universal attractive force acting between all objects with mass
- Explains that orbital motion occurs because gravity continuously deflects the path of the orbiting object
- Compares gravitational field strength on different planets and explains how this affects weight
Assessment Prompt
If your child was asked why the Moon doesn't fly off into space but also doesn't crash into Earth, could they explain that gravity is constantly pulling it into a curved path — like swinging a ball on a string?
