The force that opposes relative motion is called friction. The total momentum of an isolated system is conserved. A non-inertial frame of reference is a frame of reference in which Newton’s laws of motion do not hold. All bodies do not have the same inertia. Impacts produced by objects depend on their mass and velocity. Is Matter Around Us Pure Class 9 Notes - Chapter 2 We do know that matter is made up of particles which are arranged in a certain way. 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Vector quantity, has direction and magnitude. A non-inertial reference frame is a frame of reference that is undergoing acceleration with respect to an inertial frame. Understanding Uniform Circular Motion Class 11 12 by youtube.com. The force required for circular motion is called centripetal force.The speed of a body performing uniform circular motion is given by the formula, v = 2πr/t where r is the radius of the circular track, t is the time required for completing one round of the circular track.