The formulation of questions which address a specific concern or problem more readily lend themselves to scientific investigation. Today class, we will define work as the movement of an object through a distance, define gravity and identify work caused by gravity. We will also measure the distance an object is moved by a force. Therefore, work is the amount of force applied multiplied by the distance an object is moved. We call the unit of measurement for work a Newton-Meter.
Gravity is the force of one object pulling on another object.
Isaac Newton began to take interest in gravity when he saw an apple fall from a tree. He concluded that the force that causes apples to fall must also be the pull on all bodies in the earth's sphere toward the earth's center. Newton also studied force. Force is anything that causes a change in motion. Newton realized that the force applied must be greater than the resistance of an object to cause movement.