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Newton’s First Law Of Motion - Practice Questions & MCQ

Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET

Quick Facts

  • Newton’s First law of motion is considered one of the most asked concept.

  • 4 Questions around this concept.

Solve by difficulty

A block is kept on a frictionless inclined surface with an angle of inclination \alpha. The incline is given an acceleration to keep the block stationary. then a is equal to

Concepts Covered - 1

Newton’s First law of motion

Newton’s 1st law of motion states that if the (vector) sum of all the forces acting on a particle is zero, then and only then the particle remains unaccelerated, i.e., remains at rest or moves with constant velocity.

  • If Fnet=0 ⇒ anet=0 ⇒ forces in all directions are zero,i.e, \sum \vec{F_{x}}= 0,\sum \vec F_{y}= 0, \sum \vec F_{z}= 0

  • Newton’s first law is also called the law of inertia.

  • Newton’s laws are valid in an inertial frame of reference but are not valid in a non-inertial frame of reference.

                          Frame of reference

  • A frame of reference is one in which the observer makes his observation.

  • Types of frame of reference:

  1. Inertial frame of reference- A-frame which is at rest or moving with uniform velocity along with a

                                   straight line.

                                Example- 1. Car moving with velocity v=constant

                                                 2. Lift at rest.

                          2.  A non-inertial frame of reference- frame which is accelerated and does not have a constant velocity.

                               Example- 1. The frame traveling in a straight line but speeding up or slowing down.

                                               2. The frame traveling along a curved path.

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Newton’s First law of motion

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