# Motion in two and three dimension

Motion in two dimension: Motion in a plane is described as two dimensional motion.
Example: An ant moving on the top surface of a desk is example of two dimensional motion. Projectile and circular motion are examples of two dimensional motion.

Motion in three dimension: Motion in space which incorporates all the X, Y and Z axis is called three dimensional motion.
Example: Movement of gyroscope is an example of three dimensional motion.

# TYPES OF MOTION

## EXAMPLE

### Rectilinear, Circular and Periodic motion

• Rectilinear Motion: Motion of the object in straight line path is called rectilinear motion. For example: Motion of train on track, motion of ants in a straight path, motion of freely falling stone from top of the building towards the ground.
• Circular Motion: Motion of object in a circular path is called circular motion. For example: Children playing ringa ringa roses or moving in a circle, motion of Earth around the Sun.
• Periodic Motion: Motion of an object which repeats itself after a certain period of time is called periodic motion. For example: Motion of Earth around the sun is periodic as well as circular as it repeats it motion after time of 365 days. Motion of simple pendulum is periodic. Motion of minute and second hand in a watch is periodic.

## EXAMPLE

### Examples of different types of motion

 1 Rectilinear a) March past by the soldiers in straight line.  b)Motion of falling objects from certain height 2 Circular a) Motion of satellites around planets. b) Motion of car turning to a curved track 3 Rotational a) Motion of giant wheel b) Motion of wheels of moving vehicle 4 Periodic a) Motion of simple pendulum b) Motion of Earth on its own axis.