Newton's+Second+Law+of+Motion

="Objects will move farther and faster when they are pushed harder."= [|http://www.grc.nasa.gov/WWW/K-12/UEET/StudentSite/dynamicsofflight.html#lawofmotion]

explanation at @http://teachertech.rice.edu/Participants/louviere/Newton/law2.html media type="custom" key="10654998"

media type="custom" key="10655074"