Motion and Time are among the most popular concepts in Physics. The concept of motion and rest only applies to objects that have mass. Motion and time are two interdependent quantities that are written out as mathematical numbers in detail. The SI unit of speed and velocity is metres per second. These concepts are very useful in day to day applications. Some of the sub-topics taught in this chapter are mentioned below.
Motion is a fundamental concept used in physics. It is determined as a change in the position of an object to its surroundings in a given interval of time. This concept only applies to objects having mass. The motion of the object can be described in terms of distance, displacement, speed, velocity, time and acceleration.
Furthermore, different types of motion depend on the force acting on the body. Some of the types are translational, rotational, linear, periodic and others.
What is the Reference point?
A reference point is an important concept in understanding the motion of the object. A reference point can be defined as the stationary point that determines the motion of the object. Consider a man inside a moving train. We can see the man travelling in the direction of the train if we look at him from outside the train. As a result, the man appears to be moving to the outside observer. But what if we look at him through the eyes of the man seated just in front of him? Then he sees the man at rest- like himself. Hence, in Physics motion concepts, the reference point is very important.