Balanced : Constant speed , 0 Net force , not moving, Space shuttle floating in space , Pushing  on wall not moving , An owl sitting on a tree , Falling off a cliff at a constant speed , Car going 70 mph at a constant speed , Unbalanced : Space shuttle taking off , Speeding up, Slowing down , Net force 50, Pushing grocery cart , Owl slowing down to land , Changing directions , Kicking a football ,

Balanced Unbalanced Forces

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恢復自動保存: ?