Motion and Machines Crossword Puzzle

QUESTIONS LIST: speed : rate of change of distance over time, motion : the change in an object's position, reference : a fixed point to determine whether an object has changed position, momentum : the mass and velocity of an object, inertia : the resistance to a change in motion, newton's first law, force : a push or pull on an object, kinetic energy : energy in motion (2 words), gravity : the pull of one object on another, acceleration : change in velocity during a period of time, distance : by measuring an object's position at different times you can determine this, potential energy : stored energy (2 words), velocity : distance an object moves over a given amount of time in a certain direction