PHY110 Chapter 5.pdf - NEWTONu2019S LAW OF MOTION ZAIDATUL...

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NEWTON’S LAW OF MOTION ZAIDATUL SALWA MAHMUD FACULTY OF APPLIED SCIENCES UNIVERSITI TEKNOLOGI MARA CAWANGAN PERAK KAMPUS TAPAH 05-4067388/[email protected]
Learning Outcome At the end of this chapter, you should be able to: State the definition of Newton’s Law of Motion. Explain the applications of Newton’s Law of Motion. Analyse the gravity, normal force and friction. ZSMAHMUD/UiTMCawanganPerak/PHY110 2
Contents 5.1 NEWTON’S LAW 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 LAWS 5.4 FRICTION ZSMAHMUD/UiTMCawanganPerak/PHY110 3
5.1.1 Newton’s 1 st law of motion. ZSMAHMUD/UiTMCawanganPerak/PHY110 4 𝐹 𝑛𝑒𝑡𝑡 = 𝐹 = 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 force.” 5.1 Newton’s Laws 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/UiTMCawanganPerak/PHY110 5 The first law gives the idea of inertia. 5.1 Newton’s Laws of Motion cont Source:
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. 6 Inertia and Mass When a cardboard is jerked quickly, the coin will fall into the glass. Example Situation involving Inertia Jerking a card ZSMAHMUD/UiTMCawanganPerak/PHY110 5.1 Newton’s Laws of Motion cont
7 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. Example Situation involving Inertia Pulling a book ZSMAHMUD/UiTMCawanganPerak/PHY110 5.1 Newton’s Laws of Motion cont
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/UiTMCawanganPerak/PHY110 8 ?𝑎?? ∝ 𝑖?𝑒??𝑖𝑎 5.1 Newton’s Laws of Motion cont
9 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/UiTMCawanganPerak/PHY110 5.1 Newton’s Laws of Motion cont
5.1.2 Newton’s second law of motion ZSMAHMUD/UiTMCawanganPerak/PHY110 10 Definition : “is the relation between acceleration and force. Acceleration is proportional to force while inversely proportional to mass.” m F a net a m F net x x a m F y y a m F 5.1 Newton’s Laws of Motion cont
5.1.3 Newton’s third law of motion ZSMAHMUD/UiTMCawanganPerak/PHY110 11

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