# Laws of Motion & Friction

Jun 17th, 2015
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Newton’s First Law of Motion: A body acted on by no net force moves with constant velocity (which may be zero) and zero acceleration. Inertial Frames of Reference: A frame of reference in which Newton’s first law is valid is called an inertial frame of reference.

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Course in Physics by Theta EducationLaws of Motion & Friction :Review of Basic ConceptsNewtons First Law of Motion:A body acted on by no net force moves with constant velocity (which may be zero) and zero acceleration.Inertial Frames of Reference: A frame of reference in which Newtons first law is valid is called an inertial frame ofreference.Newtons first law of motion is not applicable to all frames of reference. It is often called the law of inertia and thereference frames in which it holds good are called inertial frames. Such frames are either fixed with respect todistant stars or are moving at a uniform velocity with respect to them. Thus, non-accelerating frames are calledinertial frames.A frame of reference moving with a constant velocity with respect to an inertial frame is also an inertial frame.A non-inertial is defined as one which is accelerating with respect to an inertial frame. A rotating frame is also anaccelerating frame. Inertial frames are non-rotating and non-accelerating frames.Theta Education : SINGAPORE IIT-ian ACADEMY Powered by IITians Contact +65 96264765Course in Physics by Theta EducationNewtons Second Law of Motion:The rate of change of linear momentum of a body is directly proportional to the applied force and the changetakes place in the direction in which the force acts.Linear momentum is defined as the product of the mass and the velocity of a body. p = m v= = =>

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