Laws Of Motion Numerical | Numericals on Laws of Motion Class 9 ICSE | PART 2 | @sirtarunrupani

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Laws Of Motion Numerical | Numericals on Laws of Motion Class 9 ICSE | PART 2 | @sirtarunrupani
Google Sir ICSE - Sir Tarun Rupani

Laws of Motion
(i) Contact and non-contact forces; cgs & SI units.
Examples of contact forces (frictional force, normal reaction force, tension force as applied through strings and force exerted during collision) and non-contact forces (gravitational, electric and magnetic).
General properties of non-contact forces. cgs and SI units of force and their relation with Gravitational units.
(ii) Newton’s First Law of Motion (qualitative discussion) introduction of the idea of inertia, mass and force.
Newton's first law; statement and qualitative discussion; definitions of inertia and force from first law, examples of inertia as illustration of first law. (Inertial mass not included).
(iii)Newton’s Second Law of Motion (including F=ma); weight and mass.
Detailed study of the second law. Linear momentum, p = mv; change in momentum ∆p
Simple numerical problems combining
F = ∆p /∆t = ma and equations of motion.
Units of force - only cgs and SI.
(iv) Newton’s Third Law of Motion (qualitative discussion only); simple examples.
Statement with qualitative discussion; examples of action - reaction pairs, (FBA and FAB); action and reaction always act on different bodies.
(v) Gravitation
Universal Law of Gravitation. (Statement and equation) and its importance. Gravity, acceleration due to gravity, free fall. Weight and mass, Weight as force of gravity comparison of mass and weight; gravitational units of force, (Simple numerical problems), (problems on variation of gravity excluded)

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