|"I'm hiding, Mommy. You don't see me."|
"A body in motion at a constant velocity will remain in motion in a straight line unless acted upon by an outside force."
"If a body experiences an acceleration ( or deceleration) or a change in direction of motion, it must have an outside force acting on it. Outside forces are sometimes called net forces or unbalanced forces."
"The Second Law of Motion states that if an unbalanced force acts on a body, that body will experience acceleration ( or deceleration)."
All that business about Newton's laws was scanged from this NASA page, because yay science!