Physics 103 Chapter 3 Newton's Laws of Motion 1-11 جامعة طيبة حاسبات ينبع скачать в хорошем качестве

Physics 103 Chapter 3 Newton's Laws of Motion 1-11 جامعة طيبة حاسبات ينبع

Chapter 3 Newton's Laws of Motion • Force Units of Chapter 3 • Newton’s First Law of Motion • Mass • Newton’s Second Law of Motion • Newton’s Third Law of Motion • Weight – the Force of Gravity; and the Normal Force Newton’s First Law Newton’s First Law: An object at rest or an object in motion at constant speed will remain at rest or at constant speed in the absence of a resultant force. A glass is placed on a board and the board is jerked quickly to the right. The glass tends to remain at rest while the board is removed. Newton’s First Law (Cont.) Newton’s First Law: An object at rest or an object in motion at constant speed will remain at rest or at constant speed in the absence of a resultant force. Assume glass and board move together at constant speed. If the board stops suddenly, the glass tends to maintain its constant speed. Understanding the First Law Discuss what the driver experiences when a car accelerates from rest and then applies the brakes. (a) The driver is forced to move forward. An object at rest tends to remain at rest. (b) Driver must resist the forward motion as brakes are applied. A moving object tends to remain in motion. 4-3 Mass Mass is the measure of inertia of an object. In the SI system, mass is measured in kilograms. Inertia  The tendency of a body to maintain its state of rest or motion. Mass is not weight: Mass is a property of an object. Weight is the force exerted on that object by gravity. If you go to the moon, whose gravitational acceleration is about 1/6 g, you will weigh much less. Your mass, however, will be the same. 4-4 Newton’s Second Law of Motion • 1 st Law: If no net force acts, object remains at rest or in uniform motion in straight line. • What if a net force acts? Do Experiments. • Find, if the net force F  0  The velocity v changes (in magnitude or direction or both). • A change in the velocity v (Δv)  There is an acceleration a = (Δv/Δt) OR A net force acting on a body produces an acceleration! F  a • From experiments: The net force F on a body and the acceleration a of that body are related. • HOW? Answer by EXPERIMENTS! – The outcome of thousands of experiments over hundreds of years: a  F/m (proportionality) • We choose the units of force so that this is not just a proportionality but an equation: a  F/m OR: (total!)→ F = ma • Second Law: Whenever a resultant force acts on an object, it produces an acceleration: an acceleration that is directly proportional to the force and inversely proportional to the mass. a proportional to F/m Acceleration and Force With Zero Friction Forces Pushing the cart with twice the force produces twice the acceleration. Three times the force triples the acceleration. Acceleration and Mass Again With Zero Friction F F a/2 Pushing two carts with same force F produces one-half the acceleration. The acceleration varies inversely with the amount of material (the mass). Physics 1 tutorials Physics 103 problems Physics 1 exam preparation Physics 103 experiments Fundamental physics concepts Examples in Physics 1 Physics 103 practice question physics103 #physics #physics1 #تسريبات #تجميعات #physics 103 #جامعة #جامعة_طيبة #فيزياء #السعودية #education #science #universityphysics #newton #exam #quiz #class