# Work and Kinetic Energy Lectures for University Physics

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Relation between Kinetic energy and the TOTAL work done on an object: the work-energy theorem The next idea couples kinematics (changes in velocity of an object) and Netwon’s second law of motion (total force on an object leading to an acceleration) to the total work done on an object. The work done by the net (total) force on an object is

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Work and Kinetic Energy Lectures for University Physics ...
Relation between Kinetic energy and the TOTAL work done on an object: the work-energy theorem The next idea couples kinematics (changes in velocity of an object) and Netwon’s second law of motion (total force on an object leading to an acceleration) to the total work done on an object. The work done by the net (total) force on an object is
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Kinetic Energy and Work-Kinetic Energy Theorem
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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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Chapter 7 – Kinetic energy, potential energy, work
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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
Work and Energy - Boston University Physics
Work and Energy 2 W = F·d ... Change in KE is the area under the net force vs. position graph. This should be contrasted with the use of the net force vs. time graph, where change in momentum is the area under the net force vs. time graph. Work-KE Theorem. 10. Two disks . Two disks are initially at rest. The mass of disk B is two times
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WORK AND KINETIC ENERGY - physicsx.pr.erau.edu
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PHY 231 HW8 Kinetic energy and work View Basic/Answers ...
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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 ...
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Physics Practice Problems: Work and Energy Page 1 of 5 Please ignore air resistance, treat all surfaces as frictionless unless otherwise specified or implied. Work and work-energy theorem: 1. A 2kg crate rests on the floor.
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physics: work and energy How to use “Ei + net Wnc = Ef ” and “Ei=Ef” (conservation of mechanical energy) to solve problems 1. Identify and label the initial and final points of the interval you are considering. 2. Identify all the forces on the object.
Physics Work and Energy Worksheet Solutions
A spring-loaded toy dart gun is used to shoot a dart straight up in the air, and the dart reaches a maximum height of 24 m. The same dart is shot straight up a second time from the same gun, but this time the spring is compressed only half as far as before ﬁring. How far up does the dart go this time, neglecting friction and assuming an ideal ...
Physics Worksheet Work and Energy - greeleyschools.org
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Physics 1100: Work & Energy Solutions - kpu.ca
How much work is done ... Assume no friction. The mass of the block is 10.0 kg. Since the problem involves a change in height and speed, we make use of the generalized Work­Energy Theorem, WNC = E = P ... surface where it passes over a 2.00­m rough patch.
Ch 8 – Energy & Work - Learn Conceptual Physics
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Physics 113 - Class Worksheet Ch 5 - Work and Energy
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Physics Work and Energy Bar Graph Worksheet
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Rotational kinetic energy - University of Nevada, Reno
Rotational Kinetic Energy 20. Repeat this experiment for three different masses (m w) of about 50gm, 70gm and 170 gm; remember to measure H 1 for each trial.Record the values for H 1 and m in Data Table II. 21. Use a meter stick to measure radius (R) of the disk; record the value in Data Table I.
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Work Energy Review . As shown in the diagram below, a child applies a ... As a ball falls freely (without friction) toward the ground, its total mechanical energy A. decreases B. increases C. remains the same . A pendulum is pulled to the side and released from rest.
PHYSICS HOMEWORK #41 ENERGY CONSERVATION WORK ... - smcisd.net
14. Suppose that you have a mass of 62.0 kg and that you walk to the top of a stairway which is h = 12.0 meters high and L= 15.0 meters deep. a. How much work will you have to do in walking to the top of the stairway? Ans. To get to the top of the stairs, W = F d=mgh = 62.0 kg . . 12 m =7291.2 J b.
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Lesson 2 Work, Energy and Power The Physics Classroom: MOP ...
Work-Energy Bar Charts Read from Lesson 2 of the Work, Energy and Power chapter at The Physics Classroom: ... of physical situations is a work-energy bar chart. A work-energy bar chart represents the amount of energy present in a system by means of a vertical bar. The length of a bar is representative of the amount
Name: Date: Physics I H Mr. Tiesler Work, Power & Energy ...
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Physics Worksheet Lesson 15 Work and Energy - erhsnyc.org
6. Calculate the power expended when a 500 N barbell is lifted 2.2 m in 2 s. 7. An escalator is used to move 20 passengers every minute from the first floor of a department store to the second. The second floor is located 5-meters above the first floor. The average passenger's mass is 60 kg. Determine the power requirement of the escalator in ...
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Work on a Sliding Block Description: A box is pushed up a frictionless incline. Find the work done by gravity, the pushing force, and the normal force. A block of weight sits on a frictionless inclined plane, which makes an angle with respect to the horizontal, as shown. A
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Energy - Kinetic Energy - BrainPOP
d. Speed and density. 7. Which of the following has the most kinetic energy? a. A car traveling at 80 kph b. A tractor-trailer traveling at 80 kph c. A cheetah running at 80 kph d. A motorcycle traveling at 80 kph 8. When is kinetic energy transferred from object to object? a. When those objects pass one another b. When the first object ...
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

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