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Force

Hpc3 notea

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Chapter 3Chapter 3Falling Objects andFalling Objects andProjectile MotionProjectile Motion Gravity influences motionin a particular way. How does a droppedobject behave??Does the objectaccelerate, or is thespeed constant??Do two objectsbehave differently ifthey have:?different masses??different shapes?

Curve Ball Lab - MATH 273

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Math 273 ? Lab 1 ? F 07 Curve Balls and Vectors Does a baseball pitch really curve or is it some sort of optical illusion? Assume the pitcher's mound is at the point (60, 0, 0) and that home plate is at the origin of our coordinate system. Suppose the pitcher throws the ball toward home plate and gives it a spin of s revolutions per second about a vertical axis through the center of the ball. This spin is described by the spin vector s where s points along the axis of revolution with length s. From aerodynamics we learn that this spin causes a difference in air pressure on the sides of the ball and results in a spin acceleration on the ball given by , where c is some empirical constant and is the velocity vector. The total acceleration of the ball is then ,

Electric Guided Notes

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Name ________________ Date ________ Block ___ GAC Physics Topic 5: Electric Currents Ch 17 5.1 Electric potential difference, current and resistance Electric Potential difference and Capacitance 5.1.1 Sec 1, Practice A, SR pg 601 Define electric potential difference. 5.1.2 Determine the change in potential energy when a charge moves between two points at different potentials. 5.1.4 Solve problems involving electric potential difference. 5.1.12 Sec 2, Practice B, SR pg 607 Relate capacitance to the storage of electrical potential energy in the form of separated charges. 5.1.13 Calculate the capacitance of various devices. 5.1.14 Calculate the energy stored in a capacitor. Electric Current and resistance Assessment statement Teacher?s notes 5.1.5

Kinematics Test Review

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Name:__________________________________________ Date: _________________________ Pd: __________ Honors Physics Mr. Roberts 2D Kinematics Test Review Conceptual Questions A bullet fired from a rifle begins to fall As soon as it leaves the barrel After air resistance reduces its speed Not at all if air resistance is ignored One ball is dropped vertically from a window. At the same instant, a second ball is thrown horizontally from the same window. Which ball has the greater speed at ground level? The dropped ball The thrown ball Neither ? they both have the same speed on impact It depends on how hard the ball is thrown

Chapter 18 Notes

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Chapter 18 Electric Forces and Electric Fields 18.1 The Origin of Electricity The electrical nature of matter is inherent in atomic structure. coulombs 18.1 The Origin of Electricity In nature, atoms are normally found with equal numbers of protons and electrons, so they are electrically neutral. By adding or removing electrons from matter it will acquire a net electric charge with magnitude equal to e times the number of electrons added or removed, N. 18.1 The Origin of Electricity Example 1 A Lot of Electrons How many electrons are there in one coulomb of negative charge? 18.2 Charged Objects and the Electric Force It is possible to transfer electric charge from one object to another. The body that loses electrons has an excess of positive charge, while

Gravity Review

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Gravity & Circular Motion Review The radius of the earth is about 6400 km. What would be the earth's gravitational attraction on 75 kg astronaut in an orbit 6400 km above the earth's surface. The mass of Mars is about 6.6 x 1023 kg, and the acceleration due to gravity is 3.7 m/s2. What is the radius of Mars? The earth's radius is 6400 km. A 25 kg mass is taken 201 km above the earth's surface. What is the object's mass at the height? What is the weight of the object at this height? What is the acceleration due to gravity at this height? The radius of a planet is 3400 km. If an object weighs 550 N at the surface of the planet, what is its weight 12 km above the surface? 210 km above the surface?

Newton's Laws

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Newton?s Laws Sir Isaac Newton Newton?s First Law Gravity Force This picture demonstrates Newton?s first law as it shows an object at rest. The reason it is at rest however, is because there are balanced forces at work. The gravity is pulling the rocket down, but that force is counter-acted by the equal force created by the base, and therefore the ground on which the rocket sits. Obviously, there are other forces at work stopping the rocket from tipping over when pushed by things such as wind, such as the red tower.

Work and Power

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Work and Power Scientific Work Energy can be transferred into or out of a system by work Work: a measure of energy transferred into or out of a system by a force (F) acting over a distance(d) Work needs 3 key ingredients: force, displacement, and cause Work is only done when force acts upon an object to cause a displacement of the object Work is only done when components of a force are parallel to the object?s displacement Examples: a teacher applying a force to a wall becomes exhausted NOT WORK no displacement A book falls off a table and free falls to the ground NOT WORK no force to cause displacement a rocket accelerates through space WORK A force causes a displacement

Physics Multiple Choice Practice

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#14 AP MC Quiz Key DYNAMICS/CIRC. MOTION/GRAVITY 1. A hypothetical planet orbits a star with mass one-half the mass of our sun. The planet?s orbital radius is the same as the Earth?s. Approximately how many Earth years does it take for the planet to complete one orbit? A)1 2? B) 1 ?2? C) D) ?2 E) 2. An object shown in the accompanying figure moves in uniform circular motion. Which arrow best depicts the net force acting on the object at the instant shown? A. A B. B C. C D. D E. E 3. The ?reaction? force does not cancel the ?action? force because: A. The action force is greater than the reaction force. B. The action force is less than the reaction force. C. They act on different bodies. D. They are in the same direction.

Physics Old Free Response

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SHS AP QUIZ 8 KEY 1976 B1 The two guide rails for the elevator shown above each exert a constant friction force of 100 newtons on the elevator car when the elevator car is moving upward with an acceleration of 2 meters per second squared. The pulley has negligible friction and mass. Assume g = 10 m/sec2. (a) On the diagram below, draw and label all forces acting on the elevator car. Identify the source of each force. (b) Calculate the tension in the cable lifting the 400-kilogram elevator car during an upward acceleration of 2 m/sec2. (Assume g 10 m/sec2.) (c) Calculate the mass M the counterweight must have to raise the elevator car with an acceleration of 2 m/sec2.

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