Lect08
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This document is a lecture summary for a Physics 103 class that covers work, energy, and kinetic energy. It includes: - Reminders about an upcoming midterm exam on chapters 1-4 - Definitions and equations for work, including the work-kinetic energy theorem - Examples of calculating work done by different forces - Definitions and conversions between different types of energy (kinetic, potential, chemical, etc.) - Examples applying concepts like work and kinetic energy to problems involving springs, gravity, and objects with mass being accelerated or dropped.
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A body which has the capacity to do work is said to possess energy.
For example , water in a reservoir is said to possesses energy as it could be used to drive a turbine lower down the valley. There are many forms of energy e.g. electrical, chemical heat, nuclear, mechanical etc.
The SI units are the same as those for work, Joules J.
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Equation 3.6
The SI unit for power is the watt W.
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The document discusses work, energy, and their units in physics. It defines work as force applied over a displacement. Positive work is done when force and displacement are in the same direction, negative when opposite. Kinetic energy is energy from an object's motion and depends on its mass and velocity. Potential energy depends on an object's position and mass. The law of conservation of energy states that energy cannot be created or destroyed, only transformed between forms.
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Work is defined as the product of the force applied and the displacement of the body in the direction of the force. For a constant force, work is equal to the force multiplied by the distance. Work can be positive, negative or zero depending on whether the force acts in the same direction, opposite direction or perpendicular to displacement. Work done by a variable force is calculated as the area under the force-displacement graph between the initial and final positions.
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Work is done when a force causes an object to undergo displacement. Work is calculated as the product of the force (F) and displacement (s) in the direction of the force (W=Fs). Energy is the ability to do work and exists in various forms including mechanical, heat, electrical, sound, light, and chemical. Mechanical energy exists in two forms: kinetic energy, which is the energy of motion calculated as one-half the mass (m) times the velocity (v) squared (K=1/2mv^2); and potential energy, which is the energy due to an object's position or strain and is calculated as the product of mass (m), gravitational acceleration (g), and height (
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This is a Powerpoint presentation based on the physics concept of work, energy, and power. It includes all you want to know about work done, different types of energies, laws of conservation of energy and power.
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This ppt is from XI class CBSE board
Energy
A body which has the capacity to do work is said to possess energy.
For example , water in a reservoir is said to possesses energy as it could be used to drive a turbine lower down the valley. There are many forms of energy e.g. electrical, chemical heat, nuclear, mechanical etc.
The SI units are the same as those for work, Joules J.
In this module only purely mechanical energy will be considered. This may be of two kinds, potential and kinetic.
Power
Power is the rate at which work is done, or the rate at which energy is used transferred.
Equation 3.6
The SI unit for power is the watt W.
A power of 1W means that work is being done at the rate of 1J/s.
Larger units for power are the kilowatt kW (1kW = 1000 W = 103 W) and
the megawatt MW (1 MW = 1000000 W = 106 W).
If work is being done by a machine moving at speed v against a constant force, or resistance, F, then since work doe is force times distance, work done per second is Fv, which is the same as power.
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The presentation discusses the concepts of energy and work. Energy is defined as the ability to do work or produce force over a distance, and comes from Greek meaning "activity." Work requires both a force and displacement in the direction of the force and can be calculated as work = force x distance. Examples of different types of energy - chemical, electrical, nuclear, sound, and mechanical - are provided. The relationship between work and energy is also explained, where work transfers energy and energy is the ability to do work.
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This document provides an overview of work, energy, and power. It defines work as force multiplied by displacement and defines the joule as the unit of work. It describes kinetic energy as the energy of motion and potential energy as stored energy due to position or shape. It states that energy can change forms through transformation but the total amount remains constant according to the law of conservation of energy. Finally, it defines power as the rate of doing work and commercial units like the kilowatt hour.
Work in physics
The document defines work in physics as being done when a force causes an object to move through a displacement. It provides the mathematical formula for work as W = Fd, where W is work, F is the applied force, and d is the displacement. It also states that work is a scalar quantity and defines the SI unit of work as the joule. Examples of positive, negative, and zero work are given based on whether the force and displacement are in the same, opposite, or perpendicular directions.
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Potential energy is energy stored in an object due to its position or state. There are different types of potential energy including gravitational potential energy, which is the energy an object gains when lifted against the force of gravity. Gravitational potential energy is calculated as the product of mass, acceleration due to gravity, and height. Kinetic energy is the energy of motion an object has due to its mass and velocity. As an object gains potential energy, it loses kinetic energy and vice versa.
Work, energy and power
The document discusses concepts related to mechanical energy, including work, kinetic energy, potential energy, and power. It defines energy as the capacity to do work and describes several forms of energy. Work is defined as the dot product of force and displacement. Kinetic energy is defined as 1/2mv^2 and depends on an object's motion. Potential energy exists in gravitational and elastic forms and depends on an object's position or state. The conservation of mechanical energy and work-energy theorem are explained. Power is defined as the rate of energy transfer.
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class 9 chapter 11 work and energy very helpful presentation
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This document summarizes Newton's laws of motion. Newton's first law states that an object at rest stays at rest and an object in motion stays in motion with the same speed and direction unless acted upon by an unbalanced force. Newton's second law relates the net force on an object to its acceleration. Newton's third law states that for every action force there is an equal and opposite reaction force. The document also discusses concepts such as motion, velocity, acceleration, momentum, and conservation of momentum.
Physics Unit 4
Unit 4 discusses work, energy, and power. It explains that energy cannot be created or destroyed, only changed from one form to another. The main forms of energy discussed are mechanical, chemical, electromagnetic, nuclear, heat, and sound. Work is defined as the product of the force component along the direction of displacement and the magnitude of displacement. Kinetic energy is related to an object's motion. The work-kinetic energy theorem states that the net work done on an object equals its change in kinetic energy. Potential energy is based on an object's position. Conservation of energy principles apply when analyzing problems involving work, kinetic energy, and potential energy. Nonconservative forces like friction violate conservation of energy since they convert mechanical energy
JC A Level H2 Physics Dynamics Notes
- A parachutist falling at constant velocity has a drag force equal to their weight due to the net force being zero.
- Newton's second law and free body diagrams are used to analyze forces on objects like cars and boxes on slopes.
- Impulse is used to relate average force and change in momentum to analyze collisions over short periods of time.
2 work energy power to properties of liquids
1) Work is done when a force causes an object to be displaced. It is defined as the product of the force and displacement in the direction of the force. Work is a scalar quantity measured in joules.
2) Energy is the ability to do work and exists in kinetic and potential forms. Kinetic energy is the energy of motion and potential energy is stored energy due to an object's position or state.
3) According to the work-energy theorem, the work done on an object equals its change in kinetic energy. For a variable force, the work is calculated as the area under the force-displacement graph.
2 work energy power to properties of liquids
Work is done when a force causes an object to be displaced. Work is defined as the product of the force and displacement in the direction of the force. Kinetic energy is the energy an object possesses due to its motion. Potential energy is the energy an object possesses due to its position or state. The law of conservation of energy states that energy cannot be created or destroyed, only changed from one form to another. Elastic collisions are collisions where both momentum and kinetic energy are conserved, while inelastic collisions conserve momentum but not kinetic energy.
Every Equation
The document discusses key physics concepts related to motion, forces, energy, and electricity. It defines terms like speed, velocity, acceleration, force, work, power, kinetic energy, potential energy, current, voltage, and resistance. Formulas are provided for calculating these values along with example problems and explanations of physics principles.
Work, energy and power
1) In an elastic collision between two bodies in one dimension, both linear momentum and kinetic energy are conserved.
2) By applying the laws of conservation of momentum and kinetic energy, equations relating the velocities of the bodies before and after collision can be derived.
3) These equations allow calculating the unknown velocities if the masses of the bodies and their velocities before collision are known.
Trabajo grupal
This document discusses energy methods for structural analysis. It introduces key energy theorems like Betti's theorem, Maxwell's theorem, and Castigliano's theorem. It also discusses potential energy and stationary potential energy. Various energy terms are defined, such as external work, strain energy, and their relationships through the principle of conservation of energy. Examples are given of calculating energy for axial forces, shear forces, torsional moments, and different structural elements. Castigliano's first theorem is introduced for determining deflections and slopes using partial derivatives of internal strain energy.
Sc(phys) chapter 7 work, energy and power
1) Work is done when a force causes an object to move in the direction of the force. Different types of energy include kinetic, potential, chemical and thermal.
2) The principle of conservation of energy states that energy cannot be created or destroyed, only converted from one form to another.
3) Kinetic energy is defined as E_k=1/2mv^2 and gravitational potential energy as E_p=mgh. These relationships can be used to solve problems involving work, energy and power.
Work,power and energy
1) Work is done when a force causes an object to move through a distance. It is calculated as work = force x distance.
2) There are different types of energy including kinetic energy from motion, potential energy that is stored, and many others from different sources.
3) The law of conservation of energy states that the total energy in an isolated system remains constant, although it can change forms from one to another, such as potential to kinetic energy.
Power Point Presentation ''Work Power Energy"
1) Work is done when a force causes an object to move through a distance. It is calculated as work = force x distance.
2) There are different types of energy including kinetic energy from motion, potential energy that is stored, and many others.
3) The law of conservation of energy states that the total energy in an isolated system remains constant, although it can change forms from one to another, such as potential to kinetic energy.
Work energy principle pptkjasldjolwjkajsdfjalsdjlasjdlakjsfljasd;falsdklashdf...
This document discusses the work-energy principle and provides examples of different types of energy. It begins by defining the work-energy principle as stating that an increase in kinetic energy of an object is caused by an equal amount of positive work done on the object. Examples of positive, negative, and zero work are then shown. The document further explains kinetic energy and provides examples, as well as explaining potential energy and giving examples. It also discusses the link between work and energy and how work done on an object changes its kinetic energy.
Classical mechanics
Here are the reaction forces described for each example:
a. The ball exerts a force of 500 N [South] on the football player's foot.
b. The table exerts an equal and opposite force of 25 N [up] on the book.
c. The bullet exerts a force of 1,000 N [West] on the gun.
d. The earth exerts a force of 5 N [up] on the apple.
Chapter 6 - Giancoli - Work and Energy
This document provides an overview of work, energy, and potential energy concepts from a physics textbook chapter. It defines key terms like kinetic energy, potential energy, conservative forces, and introduces the work-energy theorem. Examples of calculating work done by gravity and changes in kinetic and potential energy are presented. The history of Joule's experiment demonstrating the equivalence between work, heat, and energy transfer is briefly described.
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Lect08
- 2. Work 07/28/09 Physics 103, Spring 2009, U. Wisconsin Requires non-zero external force (F) and displacement ( x) in the direction ( ) of the force Units are Newton-meter defined as a joule also 1 calorie (energy raises a gm of water 1 degree C) 1 cal = 4.186 J + work is done on the object by the external force, if there is a displacement in the same direction - work is done on an object by an external force, if there is a displacement in the opposite direction. W = F x cos
- 4. Question 1 07/28/09 Physics 103, Spring 2009, U. Wisconsin A woman holds up a bowling ball in a fixed position. The work she does on the ball 1. Depends on the weight of the ball. 2. Cannot be calculated without more information. 3. Is equal to zero. Although the woman is exerting force against gravity to hold the bowling ball up, she has not shifted its position. Therefore, the work done by her on the ball is zero.
- 5. Question 2 07/28/09 Physics 103, Spring 2009, U. Wisconsin A man pushes a very heavy load across a horizontal floor. The work done by gravity on the load 1. Depends on the weight of the load. 2. Depends on the coefficient of kinetic friction between the load and the floor. 3. Is equal to zero. The load is moving horizontally, where as gravitational force is vertical.
- 11. Converting Form of Energy 07/28/09 Physics 103, Spring 2009, U. Wisconsin
- 13. Question 3 07/28/09 Physics 103, Spring 2009, U. Wisconsin When you do positive work on an object, its kinetic energy 1. increases. 2. decreases. 3. remains the same. 4. need more information about the way the work was done Work-energy theorem:
- 15. Question 4 07/28/09 Physics 103, Spring 2009, U. Wisconsin Suppose you want to ride your mountain bike up a steep hill. Two paths lead from the base to the top, one twice as long as the other. Compared to the average force exerted along the short path, F av , the average force you exert along the longer path is 1. undetermined, because it depends on the time taken 2. F av / 2 3. F av 4. 2 F av Gravitational potential energy gained is the same for both cases It is equal to average force exerted times distance Since distance traveled is twice, the F av is one-half correct
- 16. Question 5 07/28/09 Physics 103, Spring 2009, U. Wisconsin Two marbles, one twice as heavy as the other, are dropped to the ground from the roof of a building. Just before hitting the ground, the heavier marble has 1. as much kinetic energy as the lighter one 2. twice as much kinetic energy as the lighter one 3. half as much kinetic energy as the lighter one 4. no kinetic energy Final velocity of the two marbles is the same Kinetic energy is proportional to mass correct
- 18. Question 6 07/28/09 Physics 103, Spring 2009, U. Wisconsin The potential energy of a spring is 1. proportional to the amount the spring is stretched. 2. proportional to the square of the amount the spring is stretched. 3. proportional to the amount the spring is compressed. Stretching
- 19. Conservation of Energy 07/28/09 Physics 103, Spring 2009, U. Wisconsin
Editor's Notes
- 1
- The force that accompanies the “capability” takes various forms (labeling the energy). Energy (capability) can increase or decrease. That is, energy can be decreased by exerting a force that does work, and can be increased if an external force does work.