Work, Energy & Power

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Work, Energy & Power AP Physics B. There are many different TYPES of Energy. Energy is expressed in JOULES (J) 4.19 J = 1 calorie Energy can be expressed more specifically by using the term WORK(W) Work = The Scalar Dot Product between Force and Displacement.

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previous page, all five joules of input work were transformed to five joules of output work. An engineer would say the machine was 100 percent efficient, because all the input work became output work and none was lost. How friction affects real machines In real machines, the work output is always less than the work input.
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Work, Energy & Power Work, Energy & Power
Work, Energy & Power AP Physics B. There are many different TYPES of Energy. Energy is expressed in JOULES (J) 4.19 J = 1 calorie Energy can be expressed more specifically by using the term WORK(W) Work = The Scalar Dot Product between Force and Displacement.
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Work, Energy and Power In this section of the Transport unit, we will look at the energy changes that take place when a force acts upon an object. Energy can’t be created or destroyed, it can only be changed from one type into another type. We call this rule conservation of energy. Work Work and energy are the same thing. When a force moves
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Calculate the work done by a 47 N force pushing a 0.025 kg pencil 0.25 m against a force of 23 N. 3. Calculate the work done by a 2.4 N force pushing a 400 g sandwich across a table 0.75 m wide.
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4. A 25-gram paper cup falls from rest off the edge of a tabletop 0.90 meter above the floor. If the cup has 0.20 joule of kinetic energy when it hits the floor, what is the total amount of energy converted into internal (thermal) energy during the cup’s fall? (1) 0.02 J (2) 0.22 J (3) 2.2 J (4) 220 J 5.
Work, Energy & Power - bowlesphysics.com Work, Energy & Power - bowlesphysics.com
Work, Energy & Power AP Physics B. There are many different TYPES of Energy. Energy is expressed in JOULES (J) 4.19 J = 1 calorie Energy can be expressed more specifically by using the term WORK(W) Work = The Scalar Dot Product between Force and Displacement. So that means if you apply a force on an object and it covers a displacement you have ...
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4. An ideal gas expands isothermally, performing 4.40 x 103 J of work in the process. a) What is the change in internal energy of the gas? b) How much heat is absorbed during this expansion? 5. An ideal gas has its pressure cut in half slowly, while being kept in a container with rigid walls. In the process, 265 kJ of heat left the gas.
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AP Physics 1 Work Energy and Power Practice Test Name_____ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. If there is no air resistance, when they hit the ground
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22.) A spring with k=53 N/m hangs vertically next to a ruler. The end of the spring is next to the 15 cm mark on the ruler. If a 2.5 kg mass is now attached to the end of the spring, where will the end of the spring line up with the ruler marks? 23.) A novice skier, starting from rest, slides down a frictionless 35.0º incline whose vertical
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Physics Notes Class 11 CHAPTER 6 WORK, ENERGY AND POWER Work When a force acts on an object and the object actually moves in the direction of force, then the work is said to be done by the force. Work done by the force is equal to the product of the force and the displacement of the object
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Page: Unit: Work, Energy & Momentum Conservation of Energy Page: Unit: Work, Energy & Momentum Conservation of Energy
2. A 70. kg pole vaulter converts the kinetic energy of running at ground level into the potential energy needed to clear the crossbar at a height of 4.0 m above the ground. What is the minimum velocity that the pole vaulter must have when taking off from the ground in order to clear the bar? Answer: s 8.9m
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Work-Energy Theorem The kinetic energy is dened as K = 1 2 mv2 The work done by the net force on the system equals the change in kinetic energy of the system Wnet = Kf Ki = K This is known as the work-energy theorem Units of K and W are the same (joules) Note: when v is a constant, K = 0 and Wnet = 0, e.g. Uniform circular motion 3
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Thermochemistry: Chemical Energy Energy = Work + Heat Thermochemistry: Chemical Energy Energy = Work + Heat
6 Example 20 •How much work is done (in kilojoules), and in which direction, as a result of the following reaction? w = -0.25kJ Expansion, system loses -0.25kJ Example 21 •The following reaction has ΔE = –186 kJ/mol. •Is the sign of PΔV positive or negative? •What is the sign and approximate magnitude of ΔH? Contraction, PΔV is negative, w is positive
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II. Work-Kinetic Energy Theorem K K f K i W (7.4) Change in the kinetic energy of the particle = Net work done on the particle III. Work done by a constant force - Gravitational force: W F d mgdcos (7.5) Rising object: W= mgd cos180º = -mgd F g transfers mgd energy from the object’s kinetic energy.
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How much work does that force do over a distance of 6.0m? Determine if work is done in the following scenarios: A teacher applies a force to a wall and becomes exhausted. A book falls off a table and free falls to the ground. A waiter carries a tray full of meals above his head by one arm straight across the room at constant speed.
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we"can"calculate"the"mass"of"food"required:" (3600 kcal)(0.35) 1260 kcal. (3600 kcal)(0.60) 2160 kcal; and (3600 kcal)(0.05) 180 kcal; fat carbohydrate protein = = = = = = E E E " Now,"from"Table"7.1"we"can"convert the"energy"required"into"the"mass"required" for"each"component of"their"diet:" 135.5 g. 9.3 kcal 1 g 2160 kcal 9.3 kcal 1 g 526.8 g ...
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2.29 A vertical spring stores 0.962 J in spring potential energy when a 3.0-kg mass is suspended from it. (a) By what multiplicative factor does the spring potential energy change if the mass attached to the spring is doubled? (b) Verify your answer to part (a) by calculating the spring potential energy when a 6.0-kg mass is attached to the spring.
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Work-Energy Theorem The kinetic energy is dened as K = 1 2 mv2 The work done by the net force on the system equals the change in kinetic energy of the system Wnet = Kf Ki = K This is known as the work-energy theorem Units of K and W are the same (joules) Note: when v is a constant, K = 0 and Wnet = 0, e.g. Uniform circular motion 3
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Energy, Work, and Simple Machines CHAPTER Practice Problems 10.1 Energy and Work pages 257–265 page 261 1. Refer to Example Problem 1 to solve the ... m 25 N 226 Solutions Manual Physics: Principles and Problems ... (0.180 kg)(9.80 m/s2)(2.5 m)! 4.4 J 20. Mass A forklift raises a box 1.2 m and
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3. Describe how a lever can increase the force without changing the amount of work being done. 4. Explain why pulleys are in the lever family. 5. Compare the mechanical advantage of a long thin wedge with a short, wide wedge.
Chapter 6 –Work and Energy Chapter 6 –Work and Energy
Problem 6-30 (textbook): A 1.60-m tall person lifts a 2.10-kg book from the ground so it is 2.20 m above the ground. What is the potential energy of the book relative to (a)the ground (b)and the top of the person’s head? (c)How is the work done by the person related to the answers in parts (a) and (b)?
Chapter 6 – Work and Energy Chapter 6 – Work and Energy
Kinetic Energy, and the Work Energy Principle Problem 6-36 (textbook): In the high jump, Fran’s kinetic energy is transformed into gravitational potential energy without the aid of a pole.
What is the Relationship between Work and Energy? What is the Relationship between Work and Energy?
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Kinetic Energy and Work Kinetic Energy and Work
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1 – Work and Energy Example 1 Example 3 – Forces at an angle ... Whenever we use a machine to do work some of the energy we put into the machine is always lost, mainly due to friction. ... however newer vehicles are all built with large crumple zones. Why? A beanbag and a high bounce ball of equal masses are
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5 Example: big fish eats little fish A big fish, M = 5 kg swimming at 1 m/s eats a little fish, m = 1 kg that is at rest. What is the speed of the big fish just after eating the little fish? • The two fishes form a system and their momentum before the “interaction” is the same as their momentum after the “interaction”.
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Equation 1 is a statement of the work-energy theorem and is the foundation of much of our science. As such, questions of its validity are certainly worth your consideration. ... In order for the work-energy theorem to have meaning, work (F·d) and kinetic energy (mv2/2) should have the same units. Show that they do.
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Work and Energy 1. If the velocity of a moving object is doubled, the object's kinetic energy is (1)unchanged (3)doubled (2)halved (4)quadrupled 2. Which cart shown below has the greatest kinetic energy? (1) (3) (2) (4) 3. As a block is accelerated from rest along a horizontal surface, its gravitational potential energy (1)decreases (3)remains ...
Work and Energy - UCCS Home Work and Energy - UCCS Home
Work and Energy PES 1150 Prelab Questions ** Disclaimer: This pre-lab is not to be copied, in whole or in part, unless a proper reference is made as to the source. (It is strongly recommended that you use this document only to generate ideas, or as a reference to explain complex physics necessary for completion of your work.) Copying
Conservation of Mechanical Energy; Work Conservation of Mechanical Energy; Work
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Work and energy are: values Measured in Work and energy are: values Measured in
Left) Quicksilver, a mutant from the comic X-men, is said to have a top speed of 4091 m/s. What is his kinetic energy? Right) In the spiderman comic, Gwen Stacy was pushed from the top of the George Washington Bridge by evil Green Goblin. What is Gwen's Kinetic Energy just before hitting the water 184 m below if her mass is 55 kg. Where: m = v =
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The amount of work obtained from a machine is always less than the amount of work put into it. This is because some of the work is lost due to friction. The efficiency of a machine can be calculated using the following formula percent efficiency = work output / work input x 100 1. A man expends 100 J of work to move a box up an inclined plane.
work & energy - ODU - Old Dominion University work & energy - ODU - Old Dominion University
work done by several forces (examples 7.3 / 7.4 ) The sled is pulled a distance of 20.0 m by a tractor along level frozen ground. The weight of the sled & its load is 14,700 N. The tractor exerts a constant force of 5000 N at an angle of 36.9° above the horizontal. A constant 3500 N friction force opposes the motion. Find the work done on
Topic 5: Work and Energy - ed.fnal.gov Topic 5: Work and Energy - ed.fnal.gov
Topic 5: Energy Lab – Work Input and Output Energy Purpose: To compare the work input when a car is pulled up an incline to the output energy that is put into the car-earth system. Thus, calculate the energies and efficiencies of the setup. Theory: An inclined plane is one of the six simple machines and input work and output energy
Work and Kinetic Energy Lab - thephysicsaviary.com Work and Kinetic Energy Lab - thephysicsaviary.com
Name: Date: Section 2: Factors that Determine the Kinetic Energy of an object The kinetic energy of an object depends on the _____ of the object and the

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