Motion
Motion can be defined as a continuous change in the position of an object. Motion is caused by force. To move something, you need to apply a push or a pull, which is a force. Without a force, the object will be motionless, or keep moving without speeding up. In order to detect motion you have to compare it to something that is not moving or a reference point. There are a lot of factors involved in the movement of an object. There are fewer factors if an object moves at the same speed in a straight line. Most movement involves changing the speed of the movement and changing directions. Some simple examples of motion are a car moving down a street, a bird flying, and a person walking down the street. The Earth and other planets also undergo motion because they are revolving around the sun. Let's say that you were standing on a sidewalk waiting for your taxi to pick you up. As you are standing there, a truck zooms past you at a speed of 80 mph! To you, the truck seems like it is moving at 80 mph but to another truck riding right next to it at the same speed it isn't moving at all. Motion is relative and is always described in relation to a reference point.
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