# MOTION AND IT’S DERIVATIVES

Motion and movement refers to the change of position in space. Movement indicates a change in position.

CONTENT

DEFINITION OF MOTION

TYPES OF MOTION

CAUSE AND EFFECT OF MOTION

EQUATION OF MOTION

### DEFINITION OF MOTION

Movement, in physics, changes in the position or direction of the body over time. Movement along a straight line or curve is called translation. The movement that changes the direction of the body is called rotation. In both cases, all points in the body have the same speed(directional speed)and the same acceleration (rate of change in time of speed). The most general movement combines translation and rotation.

#### TYPES OF MOTION

Concepts of motion are distinguished between it’s four types

a) Random  b) Translational  c) Rotational d) Oscillatory

a) Random motion

Random is defined as the motion of an object with no specific path but undergoes sudden change in its course. Example of random motion is flying of kite.

b) Translational motion

Translational is the type in which all points of a moving body move uniformly in the same line or direction. Examples are waves. c) Rotational motion

In Rotational the object moves around a circular path, in a fixed orbit. Example is the movement of the earth round its orbit.

d) Oscillatory motion

In Oscillatory there is a to and fro movement of an object from its mean position. Example is the Oscillation of simple pendulum. Oscillatory movement of a Simple pendulum

#### IT’S CAUSE AND EFFECT

Movement is caused by force. His power makes any stationary object move because of its role and makes it change its position. Once the movement occurs, it will continue to move at the same speed and in the same direction, unless another external force acts on it.

When this happens, the speed (speed) of the movement rises, the direction changes or the movement can slow down and stop completely. In general, we can say that to move something, we need to apply a push or pull, which by definition is a force.

Force is used to start the movement, but applying a force in the opposite direction at the same time can cause the movement to stop.

#### EQUATION OF MOTION

1. V = u + at
2. S = ut + 1/2at2
3. V2 = U2 + 2as

Where u = initial velocity in mls or m5-1

v = final velocity in mls or m5-1

t = time in sec

s = distance in m

a = uniform acceleration/deceleration in mls2

Note: When an object moves or accelerates from r – st, its initial velocity, u = 0

• When a body’s velocity is constant or not changing, it acceleration a = 0
• When a body comes to rest or stops, its find velocity, v = 0

Example:- A body accelerates uniformly from rest at the rate of 3mls for 8sec, col. The distance covered by the body during acceleration. Well 1992.

a = 3mls, u = 0 because starting from rest, t = 83, s =?

The most appropriate formula to we formula 2

S = ut + 1/2at2

S = 0 x 8 + ½ x 3×82

S = 0 + ½ x 3 x 64

= 96m

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