Lesson 4, Topic 2
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Types of Motion

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• Translational Motion: This is the movement of an object from one point to another along a straight line e.g. A car travelling from Ikeja to Badagry.
• Random Motion: This is the movement of an object or a body in an undefined or irregular direction from one point to another e.g.  Movement of a gas molecule or movement of a butterfly.
• Oscillatory Motion: This is the motion of a body to and fro about a fixed point. E.g. A swinging pendulum, balance wheel of a watch, a moving church bell, etc.
• Rotational Motion: This is the motion of an object which travels in an ellipse/circle and rotates about an axis e.g. Rotation of the earth about its axis, rotation of the blades of a fan, rolling wheel.

• Relative Motion: This is the motion of a moving object in relation to a static object or another moving object e.g. A moving car and a tree, A car overtaking another car.

Example

Two cars X and Y travelling in opposite directions along the same highway at uniform velocities 200kmh-1 and 50kmh-1 respectively pass each other at a certain point. The velocity of X relative to Y at the time they pass each other is?

When they pass each other at a certain point their velocity will be

R = 200kmh-1 – (- 50kmh-1

R = 200kmh-1 + 50kmh-1  = 250kmh-1

If both cars are travelling in the same direction

Their relative velocity will be 200kmh-1 – 50kmh-1 = 150kmh-1

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