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### 9 class motion

• 1.
• 2.  An object is said to be in motion if it changes its position with respect to time and surroundings .  There are 2 types of motion :  Uniform motion  Non – uniform motion
• 3.  An object is said to be in uniform motion if it covers equal distances in equal intervals of time .
• 4.  An object is said to be in a non – uniform motion if it covers equal distances in unequal intervals of time or it covers unequal distances in equal intervals of time .
• 5.  There are certain quantities upon which motion depends , these includes :  Distance  Displacement  Velocity / speed  Time  Accelaration
• 6.  Distance is the total length of the path covered by an object during motion . The SI unit of distance is ‘m’ .  Displacement is the shortest distance between initial and final position.
• 7.  Speed of a body is defined as the distance covered by a body divided by the time taken to cover the distance .  Velocity is defined as the displacement covered by the body divided by the time taken to cover the displacement
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