FinalExamStudyGuide_Part2 - Final Exam Study Guide Part 2 1...

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Final Exam Study Guide. Part 2 Final Exam Study Guide. Part 2 1. Mechanics 1. Mechanics 1). Basic units of the System International (SI) the System International (SI) Time - the standard unit of time is the - the standard unit of time is the second (s) (s) 1 minute = 60 s , 1hour = 60 min = 3600 s 1 minute = 60 s , 1hour = 60 min = 3600 s Distance Distance - the standard unit of distance is the - the standard unit of distance is the meter (m) meter (m) Mass – the standard unit of mass is the kilogram (kg) 2). What is a vector quantity? Examples: velocity, force, acceleration 3). The Newton’s First Law 4). The Newton’s Second Law Newton’s Second Law can be expressed in a very compact way: F = m•a 5). What is a free fall acceleration, and how the weight of an object is related to its mass. 6). The Newton’s Third Law 7) Net force is a vector sum of all forces that are exerted upon an object 8) Forma of Mechanical Energy: Kinetic Energy (KE) and Potential Energy (PE) Kinetic Energy = ½ mass × (speed) 2 2 1 2 K E m v = Potential energy (PE) is the energy that arises because of an object’s position. Example: Gravitational potential energy = weight × height or PE=mgh . 9) Total Mechanical Energy = KE + PE 10 ) Theorem of Conservation of Mechanical Energy: In the absence of external forces, the total mechanical energy of a system is conserved. 2. Gravity and projectiles 1
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1) The Newton’s Law of Universal Gravitation 2) A projectile is a body that moves under the influence of gravity 2. Electricity Electrical charge is one of the basic properties of matter. Electric charge is of a quantum nature, and there is an elementary charge that is denoted as “e” An electron carries negative elementary charge (-e) and a proton carries a positive elementary charge (+e). Rule 1: Like charges repel Rule 2: Unlike charges attract each other. The SI unit of charge is 1 coulomb (C). The Coulomb Law The force exerted by one charge onto another is determined by Coulomb Law. : 1 2 2 1 2 q q F d w here q and q denot e t he c h arg es ( m easured in c oulom b ), and d is t he separat ion dis t an c e ( m easured in m et ers ) bet w een t hese c h arg es Coulomb Law shows the inverse-square dependence (or inverse square law) over the distance . 3. Magnetism All magnets have two poles: the North Pole and a south pole. Magnets produce a magnetic force field. Like poles repel each other; opposite poles attract each other. Magnetic poles always exist in pairs. 2 1 2 2 11 2 2 d 6 67 10 m m F G w here G . N m / k g - × = = ×
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Magnetism and Electricity are connected!
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