Dr. Robbins addressed the question of whether heavier objects fall faster then light-weight ones. The class did an exercise examining phases of Venus as seen from various positions of Earth. This was the data that convinced Galileo that Venus orbited the sun. Isaac Newton 1642-1727 Newton completes the Copernican Revolution by adding mathematics to Kepler's laws of planetary motion and Galileo's experiments on gravity. Mass is the measure of amount of matter in an object.
Weight is the force Earth's gravity exerts on an object.
A body continues at rest or in uniform motion in a straight line unless acted upon by some force. A body's change of motion is proportional to the force acting on it and is in the direction of the force. When one body exerts a force on a second body, the second body must exert an equal and opposite force back on the first body. Contact Mary Kay Hemenway, Ph.