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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恢復自動保存: ?