Without motion, life would cease to exist. You can look all around you and find something that has motion. For example, staring out of your window and the leaves on a tree are blowing back and forth. This is due to the effect of the wind. When we throw a baseball or drop a glass of milk and crashes to the ground. The physics of motion have pretty general rules that we all learned from elementary to make sense of the world. Motion has a lot that factors into the actually act. One is weight or mass between the objects. Weight and mass are two completely different terms and have different meanings. Weight is defined as the force of gravity on an object. So when we step on a scale to weigh ourselves, we are measuring the force of gravity against our body. Weight of an object equals the mass of an object time's acceleration of gravity. Mass of an object is the property that makes up the actual object. It's the matter we amass to create our body as a whole. So it's simply the space we take up in space. The difference between these two definitions is because they measure to completely different things.
So now we know what's the difference between mass and weight, we should see what actually sets objects in motion. One force that sets objects in motion would be gravity. We all experience gravity daily even when we wake up and sit up in bed. We have to go against gravity to lift up and sit upright. Gravity is considered one of the foundations of physics. It is always in action, when we walk, when we run, when we jump, etc. It's around us all day everyday. To help put gravity in perspective we have Newton's Laws. Newton's Law is the guidelines for objects in motion. .
Newton's first law states that an object will continue at rest or in motion in a straight line at a constant velocity unless acted upon by an external force. So if I dropped an apple from atop of a tree it should fall towards the earth at a constant speed with a direct path.
