# CHAPTER 4.pptx - PHY 130 CHAPTER 4 DYNAMICS NEWTONu2019S...

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PHY 130CHAPTER 4DYNAMICS: NEWTON’S LAW OF MOTION
DYNAMICS4.1 DEFINITION OF FORCE4.2 TYPES OF FORCES4.3 NEWTON’S LAW OF MOTION AND ITS APPLICATION4.4 STATIC EQUILIBRIUM UNDER CONCURRENT FORCE
LESSON OUTCOMES
4.1 DEFINITION OF FORCE
Unit of force - Newton (N) or Force = mass × acceleration
4.3 NEWTON’S LAW OF MOTION AND ITS APPLICATIONAn object will remainsat rest or at constantvelocity along astraight line until aforce act on it.The first law gives theidea ofinertia.Newton’s 1stlaw“the rate of change of linearmomentum of a moving bodyis proportional to the resultantforce and is in the samedirection as the force actingon it”Newton’s 2ndlawFor every action there isan equal and oppositereaction. The force actedon each body are equalin magnitude and inopposite direction.Newton’s 3rdlawInertia isdefined asthe tendency of an object to resist any change in its state of rest or motion amFnetbaabFF0netF
Inertia and MassInertiais a tendency for an object to continue its motion in the absence of a force.Mass is a quantitative measure of inertia. Mass is a property of an object. Weight is the force exerted on that object by gravity (gravitational force).Larger mass will give larger inertiaSI unit of inertia and mass is kilogram (kg)74.3 NEWTON’S LAW OF MOTION AND ITS APPLICATIONWhen a cardboard is jerked quickly, the coin will fall into the glass.
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