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ModPhy1/Unit1/Special Relativity/Inertial Frame/

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  1. Isolated Object

Law of Inertia

The Law of Inertia, also known as Newton’s First Law, asserts that an isolated object at rest will remain at rest, and an object released in motion will continue moving in a straight line at a constant speed. In essence it says massive objects do not suddenly change their state of motion without cause. They do not accelerate unless acted on by some unbalanced force. If there is no force, there is no acceleration.
 

Questions:

Q1.    Obeying the Law.
In which of the following cases does an automobile obey the law of inertia?  (A) The accelerator peddle is pushed to the floor. (B) The brake peddle is pushed down. (C) The steering wheel is turned to the side. (D) The car spins and slides across a slick ice-covered lake. (E) None of these.
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Q2.      Which of the following cases illustrates the Law of Inertia? (A) An object moving in an inertial frame. (B) An object in free fall. (C) An object rounding a curve at constant speed. (D) An object at rest. (E) More than one of these.
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  1. Isolated Object – An object completely free of all forces.

ModPhy1/Unit1/Special Relativity/Inertial Frame/