ch4 continued - A recitation: HSS 2 01 36 riday 3 pm TA...

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Unformatted text preview: A recitation: HSS 2 01 36 riday 3 pm TA recitation: HSS 2.01.36 Friday 3-4pm Chapter 4 The Laws of Motion ontinued continued 1 Conceptual Question 2 If gold were sold by weight, would ou rather buy it in Denver or in you rather buy it in Denver or in Death Valley? it were sold by mass in which of If it were sold by mass, in which of the two locations would you prefer buy it? to buy it? 2 Gravitational Force Newtons Law of Universal Gravitation : Every particle in the Universe attracts every other particle ith a force that is irectly proportional the product of 2 2 1 g r m m G F with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them 6 67 X 10 1 m g G=6.67 X 10-11 N m 2 /kg 2 3 Exercise 4.3 To one significant digit, find the force exerted by the Moon on a 70-kg man on Earth. The Moon has mass of 7 36 X 10 2 g and is 3 84 X 10 a mass of 7.36 X 10 22 kg and is 3.84 X 10 8 m from Earth. If the distance between the Earth and the Moon was suddenly reduced by , how would that force change? 4 Newtons Third Law Hammer exerts a force on the nail, , accelerating it into the wall. Nail exerts a force on the hammer, slowing it down and stopping it. pp g 5 Newtons Third Law If object 1 and object 2 interact, the force exerted by object 1 on object 2 is equal in agnitude ut pposite in direction the magnitude but opposite in direction to the force exerted by object 2 on object 1. 2 21 F F Equivalent to saying a single isolated force cannot exist 12 21 6 Action and Reaction Forces F 12 may be called the action force and F 21 the reaction force Actually, either force can be the action or the reaction force The action and action forces act reaction forces act on different objects 7 Some Action-Reaction Pairs 8 Forces Acting on an Object Newtons Law use the forces acting on an object are cting on the TV g and n F acting on the TV are acting on other ' ' g and n F objects 9 Quick Quiz 4.3 A small sports car collides head-on with a massive truck. The greater impact force ( in magnitude) acts on ) the car (a) the car (b) the truck (c) neither, the force is the same on both. Which vehicle undergoes the greater magnitude acceleration? ) the car (a) the car (b) the truck (c) the accelerations are the same. 10 Newtons Laws of Motion in a Nutshell First Law Law of inertia bject has no net force acting on it object has no net force acting on it Second Law bject has a net force acting on it a F m object has a net force acting on it Third Law 21 12 F F single isolated forces cant exist 11 Applications of Newtons Laws Types of problems Ropes State of motion Objects in equilibrium Springs Pulleys evel surfaces Accelerating objects Level surfaces Inclined planes Falling / Raising objects orces...
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ch4 continued - A recitation: HSS 2 01 36 riday 3 pm TA...

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