Balanced and Unbalanced Forces - 3rd Grade Science

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Question

A toy train is rolling on a smooth surface. I am investigating how unbalanced forces affect an object's motion, so I push a heavy car into the train and then repeat it again but with a lighter car. What effect on the train's motion will I most likely notice?

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Answer

In this scenario, there is an example of unbalanced forces. When an unbalanced force is applied to an object, there can be a change in motion. When the heavier toy car moves into the path or side of the train, it will cause the little vehicle to change speeds, directions, or even stop. This change in motion is due to a stronger force acting upon the toy train. The lighter car may have an impact on the train's movement, but it will not be as great.

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