PHY110 Chapter 5.pptx - PHY110 CHAPTER 5 NEWTONu2019S LAW...

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PHY110 CHAPTER 5 NEWTON’S LAW OF MOTION PHY110 CHAPTER 5 NEWTON’S LAW OF MOTION 1 ZSMAHMUD/UiTMPAHANG/PHY110
Contents 5.1 LAWS OF MOTION 5.1.1 Newton’s 1 st law of motion 5.1.2 Newton’s 2 nd law of motion 5.2.3 Newton’s 3 rd law of motion 5.2 GRAVITY & NORMAL FORCE 5.3 APPLICATIONS OF NEWTON’S LAW 5.4 FRICTION ZSMAHMUD/UiTMPAHANG/PHY110 2
5.1 Law of Motion 5.1.1 Newton’s 1 st law of motion Law of Inertia ZSMAHMUD/UiTMPAHANG/PHY110 3 ? ???? = ? = 0 Definition : States that “an object at rest will remain at rest, or continues to move with uniform velocity in a straight line unless it is acted upon by an external forces.”
5.1.1 Newton’s first law of motion Inertia Defined as the tendency of an object to resist any change in its state of rest or motion. A scalar quantity ZSMAHMUD/UiTMPAHANG/PHY110 4 The first law gives the idea of inertia. 5.1 Law of Motion – cont…
Explanation: The inertia of the coin resists the change of its initial state, which is stationary. As a result, the coin does not move with the cardboard and falls into the glass because of gravity. 5 Inertia and Mass When a cardboard is jerked quickly, the coin will fall into the glass. Situation involving Inertia 1 – Jerking a card [NHB]
6 Explanation: Inertia tries to oppose the change to the stationary situation, that is, when a book is pulled out, the book on the top do not follow suit. Inertia and Mass When a book is pulled out, the book on the top will fall downwards. Situation involving Inertia 2 – Pulling a book [NHB]
Mass , m Is defined as a measure of a body’s inertia. Is a scalar quantity S.I. unit: kilogram (kg) Mass of a body increases, inertia will increase. ZSMAHMUD/UiTMPAHANG/PHY110 7 ????∝??????? 5.1 Law of Motion – cont…
8 Relationship between Inertia and Mass Larger mass – greater inertia Explanation: Object with more mass offers a greater resistance to change from its state of motion. Object with larger mass has larger inertia to resist the attempt to change the state of motion. Bucket filled with sand is more difficult to be moved . It’s also more difficult to be stopped from swinging. [NHB]
ZSMAHMUD/UiTMPAHANG/PHY110 9 Weight, Is defined as the force exerted on a body under gravitational field.

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