Balanced force: A ball on a finger, Pressing on a wall, The rocks not moving, An empty scale, These rocks, The men pushing, A boy sitting on a chair, Unbalanced force: The man falling from the chair, A ball moving., Driving a car., Breaking a brick, This tug of war., The hulk breaking wall., A waterfall.,

Balanced vs Unbalanced force

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切換範本

恢復自動保存: ?