Work Power and Energy
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Work is defined as a force acting on an object and moving it through a displacement. It is calculated as work = force x displacement. The SI unit of work is the joule. Work can be positive when force and displacement are in the same direction, zero when they are perpendicular, and negative when opposite. Power is the rate of doing work and is calculated as power = work/time, with the unit watt equal to joule/second. Energy is the ability to do work and has the unit joule.
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Kinetic energy is the energy of motion and is calculated as K = 1/2 mv^2, where m is mass and v is velocity. Doubling speed quadruples kinetic energy, and tripling speed multiplies it by nine. The SI unit for kinetic, potential, and all other types of energy is the Joule. Potential energy depends on mass, gravitational field strength, and height. The total energy before and after an energy transformation will be equal according to the law of conservation of energy. Work is calculated as the force times distance and is measured in Joules. Forces acting perpendicular to or causing zero displacement do no work.
Mechanical energy
Kinetic energy is the energy of motion and is calculated as K = 1/2 mv^2, where m is mass and v is velocity. Doubling speed quadruples kinetic energy, and tripling speed multiplies it by nine. The SI unit for kinetic, potential, and all other types of energy is the Joule. Potential energy depends on mass, gravitational field strength, and height. The total energy before and after an energy transformation will be equal according to the law of conservation of energy. Work is the product of force and displacement and can be positive, negative, or zero depending on the direction of force relative to motion.
Work
1) Work is defined as a force causing an object to undergo displacement. Work is calculated as the product of the force (F) and displacement (d) in the same direction.
2) If the force is not parallel to the displacement, only the component of the force parallel to displacement does work. Work is then calculated as F1 times d, where F1 is the parallel component of force.
3) Work can be positive, negative or zero. Positive work occurs when force and displacement are in the same direction. Negative work occurs when they are in opposite directions. Zero work occurs when force is perpendicular to displacement.
Work
1) Work is defined as a force causing an object to undergo displacement. Work is calculated as the product of the force (F) and displacement (d) in the same direction.
2) If the force is not parallel to the displacement, only the component of the force parallel to displacement does work. Work is then calculated as F1 times d, where F1 is the parallel component of force.
3) Work can be positive, negative or zero. Positive work occurs when force and displacement are in the same direction. Negative work occurs when they are in opposite directions. Zero work occurs when force is perpendicular to displacement.
P11.-WORK.ppt
Here are the answers:
1. Work = Force x Distance
= 50N x 10m
= 500 Joules
2. Work = Force x Distance
= Weight x Height
= 45 kg x 9.8 m/s^2 x 1.2m
= 546.4 Joules
3. Total Force = Tom's Force + Jerry's Force = 50N + 70N = 120N
Work = Total Force x Distance
= 120N x 4m
= 480 Joules
Work & Energy
Explain work, energy and power. The Law of Conservation of Energy is utilized as well as conservative and non conservative systems.
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Work, energy and power
Work is done when a force causes an object to move in the direction of the force. Work is measured in joules, which is equal to applying a force of 1 newton over a distance of 1 meter. Power is the rate at which work is done and is measured in watts. The work-energy theorem states that work done on an object transforms into a change in the object's kinetic energy. Various types of energy, such as gravitational potential energy, kinetic energy, and heat can be transformed into one another but the total amount of energy remains constant due to the law of conservation of energy.
class 11 physics work energy and power study material free pdf download
class 11 physics work energy and power study material free pdf downloadVivekanand Anglo Vedic Academy
Welcome to the fascinating world of Work, Energy, and Power! In the realm of physics, these concepts form the cornerstone of understanding how objects interact with each other and how energy is transformed within systems. From the motion of everyday objects to the dynamics of celestial bodies, the principles of work, energy, and power are ubiquitous, shaping the very fabric of the universe.
For more information, visit-www.vavaclasses.comSlide share tst inno
Work is defined as the product of the force applied and the displacement of an object in the direction of the force. Energy is the ability to do work and is measured in joules. There are many types of energy including mechanical, chemical, thermal, and nuclear. Energy can be converted from one form to another. For example, gravitational potential energy can be converted to kinetic energy as an object falls. Mechanical energy, the focus of the document, includes work, which is force times displacement, and power, defined as the rate at which work is done or energy is transferred.
Work and energy part a
The document discusses work, energy, and the work-energy principle as an alternative way to analyze motion compared to using forces and Newton's laws. It defines key terms like work, kinetic energy, and systems. The work-energy principle states that the net work done on an object equals its change in kinetic energy (Wnet = ΔKE). This allows reexpressing Newton's second law in terms of energy rather than forces. Examples show how to calculate work, kinetic energy, and use the work-energy principle to solve motion problems.
Do Work!
This document provides an overview of key concepts related to work, energy, and power including:
- The definitions and relationships between work, kinetic energy, gravitational potential energy, and elastic potential energy.
- Conservative and non-conservative forces.
- How to calculate work done by non-conservative forces.
- The work-energy theorem and the law of conservation of energy.
- The definition of power as the rate of doing work.
6-a-work-energy-power.ppt
1. The document discusses different topics related to work, energy and power including dot product, definitions of work and energy, forms of energy, kinetic energy, work-energy theorem, and potential energy.
2. Key concepts covered are the mathematical definitions of work as the product of force and displacement, and of kinetic energy as one-half mass times velocity squared.
3. The work-energy theorem states that the work done on an object equals its change in kinetic energy, or the work equals the final kinetic energy minus the initial kinetic energy.
A work, energy and power
Work is defined as the force applied over a distance. Only forces parallel to the direction of motion do work. Work can be calculated for constant and variable forces. The work-energy theorem states that work done on an object changes its kinetic energy. Power is the rate at which work is done and is calculated as work divided by time. Instantaneous power uses calculus to calculate the power at an instant in time as the rate of change of work with respect to time.
workenergypowerbyakshat-151106163627-lva1-app6892.pdf
1) The document discusses different forms of energy including kinetic energy, potential energy, and gravitational potential energy.
2) Kinetic energy is the energy an object possesses due to its motion, and depends on the object's mass and velocity.
3) Potential energy is energy stored within a system due to an object's position or shape, such as energy stored when stretching a spring.
Kinetic theory
Work, energy, and power are defined. Work is force times distance. Kinetic energy is equal to one-half mass times velocity squared. Power is the rate of doing work, defined as work per unit time. Several examples of calculating work are provided for different scenarios like lifting an object, lowering an object, and work done by springs. The concept that work is based on the force component in the direction of motion is emphasized.
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Work and energy. Practical Problems on Work and Energy
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class 11 physics work energy and power study material free pdf download
class 11 physics work energy and power study material free pdf download
workenergypowerbyakshat-151106163627-lva1-app6892.pdf
workenergypowerbyakshat-151106163627-lva1-app6892.pdf
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Work Power and Energy
- 2. WORK Definition Mathematical Form Unit Cases of Work
- 3. Q. What is work? A. Work is said to be done when a force acts on a body and moves it through a certain displacement. WORK d Work done by the Force F mm F
- 4. Mathematical Form: WORK d Work done by the Force F mm F
- 5. If force is applied on a body and it moves the body through a displacement ‘d ’, then the work 'W' is defined by the relation W = F. d We have already studied scalars and vectors. Q. What is the nature of work? A. Work is a scalar quantity. WORK
- 6. Unit of work: The SI unit of work is joule (J). One Joule When a force of one Newton moves a body through a distance of one meter in the direction of force, then the work done is equal to one joule. WORK
- 7. Positive Work CASES OF WORK When force and displacement are in the same direction Then = 0° W = F d cos 0° = F d x 1 = F d
- 8. Example Work done by the Force m m F CASES OF WORK d
- 9. Zero Work When force is perpendicular to the displacement Then = 90° W = F S cos 90° = F x 0 = 0 In this case work done is zero. CASES OF WORK
- 11. When force and displacement are in the opposite direction Then = 180° W = F d cos 180° = F d x (-1) cos 180° = -1 W = - F d CASES OF WORK Negative Work
- 12. Condition for Negative work d W CASES OF WORK
- 13. Q. Give an example of positive work? A. Pushing something horizontally is an example of positive work. Q. Give an example of negative work? A. Lifting something vertically upwards is an example of negative work. WORK
- 14. Why work is Zero ?
- 15. POWER
- 16. • Power is measured by the amount of Work done in One Second. • If Work W is done in ‘t’ seconds, then Power Thus, • Smaller the time in which Work is done, the greater is the Power. • Power is a Scalar Quantity. • Unit of Power is Watt. • Watt is equal to Joule/second. • Watt is equal to Kgm2/s3 . • Dimension of power is M1 L2 T-3. P=W/ T
- 17. Energy
- 18. • Energy is the Capacity of a body to do Work. • Energy represents the total amount of Work that a Body can do. • Unit of Energy is Joule. • Joule = Kgm2/s2.
- 19. Numerical The two springs for reversing the motion of a heald shaft each have to be stretched 15cm to put them in position with the heald shaft down. If the stiffness of each spring is 1.5N/cm find the work done in putting the springs in position. Stiffness∞ force
- 20. Solution : Total force required to stretch each spring = 1.5×15 = 22.5N Total force = 22.5×2 = 45N Work done = f.d =45×15 Ncm =675Ncm
- 21. Solution: W = 675÷100 Nm W = 6.75Nm W = 6.75 J
- 22. Numerical on Power A ringframe traveller, moving in a circle of 5cm in diameter at 9000rev/min, offers a resistance to movement of 0.15N. If the frame has 240 spindles, calculate the power expended in moving the travellers.
- 23. Solution: Distance moved by traveller in one revolution = 5¶ = 5(3.14) = 15.70cm Distance moved per second = 15.70×9000÷60 = 23.55m
- 24. Solution: W = f.d Work done per second on each traveller = 23.55×0.15N W = 3.53J Total work done = 3.53 on each of 240 spindles per second Power expended = 847.2W
- 26. You don't always get what you wish for, you get what you work for.
- 27. THANK YOU