# Physics : Basic Motion

Previous Topic : Fundamental Measurement

# Motion

a] Motion : is the visible movement of an object from one place to another which is caused by an applied force.
There are two words associated with Motion which are DYNAMICS and KINEMATICS.

(1)

## Dynamics

Dynamics : is the study of an object in motion and the forces applied to it.
That is, it is the study of an object moving and the force that put the object into motion

(2)

## Kinematics

Kinematics : is the study of only an object in motion.
That is, it is the study of an object, only when it is in motion. I.e not talking about the force applied.top↑

## Types Of Motion

We have five types of motion, Random motion, Translational or linear motion, oscillatory or vibratory motion, Rotational motion and circular motion, those are the five motion that we have,

Now let analyse it one by one,

### Random Motion

a] Random motion : from the word random, Random motion is the movement of an object with no specific direction or it is a zig-zag motion. E.g

(1) The movement of an insect,
(2) the movement of gas molecules or the movement of pollen particles and also,
(3) the movement of woman in the market.top↑

### Translational Or Linear Motion

b] Translational or linear motion : what does linear mean in physics? It mean moving in a straight line,
So linear motion is the movement of an object in a straight line as a result of force applied. Linear motion is also called displacement motion.

E.g (1) A moving car.
(2) A person pushing trolley in a supermarket from one point to another along a straight line.
(3) A boy going to school.
(4) A woman pushing her baby’s pram (baby trolley) from one point to another along a straight line.

### Oscillatory Or Vibratory Motion

c] Oscillatory or Vibratory motion : it is the movement of a body about a fixed point repeating itself in an equal intervals of time along the same path.top↑

E.g(1) The to and fro movement of a swinging pendulum bob.
(2) The to and fro movement of the wings of a flying bird.
(3) The motion of a plucked guiter spring or violin.
(4) The to and fro movement of a vertical motion of a suspended helical spring.
(5) The to and fro of a loaded test tube.

NOTE : in physics to and fro means TO and FROM not TO and FLOW.

### Rotational Motion

d] Rotational motion : from the word rotate : it is the movement of an object or body that moves in a circle or ellipse and rotates about an axis.

E.g (1) The rotation of a fan blades about a fixed point.top↑

### Circular Motion

e] Circular motion : from the word circle, it is the movement of a body or an object in a circle at a constant speed.

E.g (1) The motion of the moon and the sun round the earth.

Let stop here today, I would have treated motion under gravity and law of motion with this topic but there are some topics that you as to be understand before analyzing law of motion and motion under gravity, topics like speed, velocity and acceleration and also what a force is. our next class will be on FORCES. top↑

Please if you don’t understand, feel free to inform me via the comment box, and I will be happy to take the session again, your comment notifications is like a bank alert to me.
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