Linear MotionA series of free High School Physics Video Lessons from Brightstorm online Physics series.
Relativity in Motion The motion of any object is only meaningful when given relative to something else. Relativity in motion assures us that the laws of physics don't vary depending on how much inertia an object has. This is important because everything has some amount of inertia. Standing on the surface of the earth, we feel that we are not in motion, but because the earth is moving, so are we. If we measure the speed of a ball thrown atop a train, we can either measure the speed of the ball with respect to the train’s motion or with respect to the motion of the earth.
Displacement Displacement is the change in a position vector. It is not the same as distance, which is a scalar measurement. The net vector of multiple displacement vectors if found according to the rules of vector addition.
Average Speed Speed refers to the rate at which an object travels. Unlike velocity, speed is a scalar quantity so direction does not matter. Average speed is calculated by dividing distance by time (e.g. miles/hour).
Speed - Instantaneous Speed Speed refers to the rate at which an object travels. Unlike velocity, speed is a scalar quantity so direction does not matter. Instantaneous speed is the speed of an object in motion at a specific point in time. This is determined similarly to average speed, but we narrow the period of time so that it approaches zero. If an object has a standard speed over a period of time, its average and instantaneous speeds may be the same.
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