# Define:- 1) linear motion 2)Circular motion 3)periodic motion 4)Oscillatory Motion 5)Rotational motion

1-Linear motion- It is a motion of a particle along a straight line.it is also called rectilinear motion.
2-Circular motion: In this motion point particle moves in a circular orbit
3-Rotational motion: An object is said to possess rotational motion if it whirls around a fixed axis that passes through it.
4-Oscillatory motion - It is that motion in which a body moves to and fro or back and forth repeatedly about a fixed point (called mean position) in a definite interval of time. E.g., the motion of the pendulum of wall clock is oscillatory motion.
5-Periodic motion-It is a type of motion which repeats itself after every fixed interval of time.

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Linear motion-

Linear motion (also called rectilinear motion) is motion along a straight line, and can therefore be described mathematically using only one spatial dimension. The linear motion can be of two types: uniform linear motion with constant velocity or zero acceleration; non uniform linear motion with variable velocity or non-zero acceleration. The motion of a particle (a point-like object) along a line can be described by its position , which varies with (time). An example of linear motion is an athlete running 100m along a straight track.

Linear motion is the most basic of all motion. According to Newton's first law of motion, objects that do not experience any net force will continue to move in a straight line with a constant velocity until they are subjected to a net force. Under everyday circumstances, external forces such as gravity and friction can cause an object to change the direction of its motion, so that its motion cannot be described as linear.

Circular motion-Circular motion can be described as movement of an object in a circular manner maintaining a uniform angle. The result of circular movement is uniform centripetal force. An object moving in a circular motion around another object it is said to be orbiting the latter.

periodic motion-Periodic motion is any motion that repeats itself. Examples of periodic motion include a bouncing ball, vibrating spring, circular motion, and a pendulum. Bouncing ball

Oscillatory motion-Oscillation is the repetitive variation, typically in time, of some measure about a central value or between two or more different states. Familiar examples include a swinging pendulum and alternating current power. The term vibration is sometimes used more narrowly to mean a mechanical oscillation but is sometimes used as a synonym of "oscillation". Oscillations occur not only in mechanical systems but also in dynamic systems in virtually every area of science: for example the beating human heart.

rotational motion-Rotational motion is motion that is performed around a fixed axis. This is also known as circular motion. Rotational motion is usually performed at a constant speed. Equal and opposite forces must be exerted to get rotational motion. When an object wobbles, then one can assume that the axis was a moving one. It is impossible for an object to rotate around two fixed axises at the same time. The hands of a clock moves in what is known as rotational motion.

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