Science Forces & Motion Language 9–11 yrs

Force & Motion Vocabulary

力与运动词汇

Description

Use technical vocabulary for force and motion — balanced forces, unbalanced forces, resultant force, acceleration, deceleration, speed, moment, lever, fulcrum, mechanical advantage — and apply these when explaining and predicting how forces affect the motion and position of objects

Mastery Evidence

✓ Distinguish between balanced and unbalanced forces and describe the effect of each on an object's motion
✓ Use 'resultant force' correctly when describing the net effect of two or more forces acting on an object
✓ Apply 'moment', 'lever', and 'fulcrum' correctly when describing how simple machines work

Assessment Prompt

Can your child explain why a seesaw stays level when two people of different weights sit at different distances — using words like 'balanced forces' or 'moment'?