Science
Forces & Motion
Conceptual
11–12 yrs
Relative Motion
相对运动
Description
Explain relative motion — how the apparent speed and direction of an object depends on the observer's own motion — using everyday examples such as trains and cars passing
Mastery Evidence
- Explains why a train moving at the same speed in the same direction as another appears stationary to passengers on that train
- Calculates relative speed when two objects move towards or away from each other
- Explains why the frame of reference matters when describing motion
Assessment Prompt
If your child was on a train and another train passed going the same direction but faster, could they explain why it looks slow even if it's actually travelling at high speed?
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