# PHYSICS DEFINITION AND CLASSICAL PHYSICS

Jun 17th, 2015
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1. Physics - Science that deals with the structure of matter and the interactions between the fundamental constituents of the observable universe. 2. Classical physics is often described as the study of physics on the macroscopic level, meaning questions are generally investigated without the aid of highly technological equipment

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Section 1 - MechanicsThe effect of a force on an objects velocity is dependent on its massThe resistance to a change in velocity is called inertiaMomentumThe momentum of an object is defined as its mass x velocityThe units of momentum are Kgms-1Newtons laws of motionNewtons first law Every object continues at rest with uniform velocity unlessacted upon by a resultant force.So an object moving through space will travel at a constant velocity without slowingdown since there are no other forces such as friction and air resistance acting upon it.Newtons second law The rate of change of momentum on an object is proportionalto the resultant force acting upon it.Rate of change of momentum for an object initially at rest is given by the change inmomentum over time:F= mvTSince V = acceleration, F=maTNewtons third law When two object interact, they exert equal and opposite forcesupon each otherImpulseWhere forces only act briefly, an impulse is exerted by the force.Impulse = Force x time. Its units are therefore NsSince Newtons second law states that force = change in momentum/time, we can saythat impulse must equal change in momentum.Impulse = mv - muConservation of momentumFor a system of interacting objects, provided that no external force is acting, the totalmomentum before any collisions is equal to the total momentum after any collisions.In an explosion, momentum is conserved. However since the momentum before anexplosio

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