Newton's Law

                                           Newton Law

Isaac Newton (1642-1727)

     You can carry forward a table by pulling or pushing it to make this object move. If it you stop pulling or pushing, the table will stop to. This shows that in order to make an object move, force is needed. When paper is pulled slowly, the marble will move together with paper. If the paper is stopped, the marble still move in paper. This is because the moving marble will maintain its motion. In contrast, when paper is pulled quickly, the marble remain silent.