TYPES OF MOTION

TYPES OF MOTION

 

1. TRANSLATORY MOTION

Translatory motion or translational motion occurs when all points in a body move the same distance in the same amount of time.

Whenever a body is shifted or moved from one point to another point, then the body said to be experienced translational motion. As in this case, all points of a moving body move uniformly in the same line or direction.

The translatory motion does not always require that the object move in a straight
line.

Example:

·     A train moving in its track,

·     A man walking on the road,

·     Birds flying in the sky.

 

RECTILINEAR/LINEAR MOTION:

When the motion is in a straight line, it is called linear motion. Rectilinear motion is
a type of translatory motion.

Example:

·      A car moving on a straight road.

·      A train moving on a straight track                                                    

·      A stone falling from a height.

·      March of an Army. 

·      Elevator moving up and down.

 

                                      

 CURVILINEAR MOTION:

When the motion is on a curved path, it is called curvilinear motion. This scenario is viable if an object moves in a curved path without changing its orientation.

                                     

 

Example:

·      A car moving on a bend.

·     A stone thrown in the air at an angle.

·     Curved Path of a swing

 

2. CIRCULAR MOTION:

When the motion is on a circular path, it is called circular motion.

EXAMPLE:

The motion of the earth in its orbit.

The object maintains a fixed distance from a fixed point.

 

3. ROTATIONAL MOTION:

When an object moved around an axis, it is called rotation, e.g. rotation of the earth
on its axis. The center of mass will remain at its place and the whole body moves about the center of mass. Like a top spinning on its axis.

Examples: Rotating blades of a fan, a child sitting on a merry-go-round, the tips of the hands of a clock.

4. PERIODIC MOTION:

When the motion is repeated after a fixed interval, it is called periodic motion. Periodic motions are abundant in nature.

Examples:

·     Change of season 

·     Day & Night formation 

·     Heart Beat 

·     The motion of the bob of the simple pendulum

·     Motion of a planet around the sun

·     Motion of the tip of the minute and hour hands of a clock

·     Motion of a boy sitting in a swing 

·     Motion of the needle of a sewing machine operating at constant speed

·     Sunrise.

·     Sunset

·     Rotation & Revolution of earth

·  Beating of drum

·    Pendulum clock

 

Periodic motions can be classified into two main categories.

1. Natural periodic motions:

·     which occur in nature without any external force;

2. Artificial or man-made    periodic motions.

·     These motions are forced periodic motions such as diesel engines.

 

5. NON-PERIODIC MOTION:

Non-periodic changes are the changes that do not repeat themselves after a fixed interval of time. 

Example: 

·     Tornado, Volcanic eruption, Tsunami, Forest Fires (most of the natural disasters).

·     Swaying of the branches of a tree

·     Motion of a bouncing ball under the action of gravity and friction

·     The running of a batsman between the wickets

·     Motion of the pestle in a mortar when operated manually.

·     Movement of our hand while writing

·     Movement of legs while dancing and walking

·     Waving hand Are non-periodic motion

 

6. OSCILLATING MOTION 

 

Swinging from side to side, like a pendulum in a clock.

Oscillatory motions are a type of periodic motion.

 A pendulum is a good example for an oscillatory motion. In the simple pendulum, the bob oscillates to and fro over the middle equilibrium point. 

 

FACTORS THAT AFFECT TIME PERIOD

The period of such a device can be made longer by increasing its length, as measured from the point of suspension to the middle of the bob.

A change in the mass of the bob, however, does not affect the period, provided the length is not thereby affected. 

The period, on the other hand, is influenced by the position of the pendulum in relation to Earth. Because the strength of Earth’s gravitational field is not uniform everywhere, a given pendulum swings faster, and thus has a shorter period, at low altitudes and at Earth’s poles than it has longer period at high altitudes.

 

7. RANDOM MOTION 

It is known as irregular motion, which means any motion that has no fixed pattern. Bees fly in an irregular motion.

Sometimes an object can display combinations of different types of motion.

For example,

1. A moving car which moves straight on the road. It displays rectilinear motion but at the same time the wheels of the car are moving in circles displaying circular motion. So the wheels of a moving car execute both rectilinear and circular motions.

2. In a sewing machine, the tip of the needle is in rectilinear motion as well as in periodic motion. 

3. Birds gliding in the sky have both translational and non-periodic motion.

4. Rotation of the Earth on its axis is a combination of rotational and periodic motion.