Science : Motion

**Summary**

·
Motion is a change of position, which** **can be described in terms of the distance moved or the
displacement.

·
The motion of an object could be** **uniform or non-uniform depending on its velocity.

·
The speed of an object is the distance** **covered per unit time and velocity is the displacement per unit
time.

·
The acceleration of an object is the** **change in velocity per unit time.

·
Uniform and non-uniform motion of** **object can be shown through graphs.

The motion of an object at uniform acceleration can
be described with the help of three equations, namely

*v = u + at *

*s = ut + ½ a t ^{2}*

* v ^{2}=
u^{2} + 2as *

where u is initial velocity of the object, v is its
final velocity, s is the distance travelled in time t, a is the acceleration.

For a freely falling body the acceleration a is
replaced by g.

An object under uniform circular motion experiences
centripetal force.

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9th Science : Motion : Summary of Motion |

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