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Work is the transfer of energy through motion caused by a force acting over a distance. The amount of work done depends on the force applied and the distance over which it acts. Work can be calculated using the formula Work=force x distance. Conservation of energy states that the total mechanical energy in a system remains constant if no non-conservative forces act. If non-conservative forces are present, they may change the total energy by doing work which transfers energy into other forms like heat. Springs obey Hooke's law, such that the force applied by a spring is proportional to its displacement from its resting length.
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Work energy power 2 reading assignment -revision 2 physics
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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.
Work-and-Energy.pptx
- Energy is the ability to do work and exists in various forms such as potential and kinetic energy. Potential energy is the stored energy of an object due to its position or state.
- Gravitational potential energy is the energy possessed by an object due to its height and is calculated as PE = mgh. Elastic potential energy is the energy stored in stretched or compressed springs and is calculated as PE = 1/2kx^2.
- Examples are provided to demonstrate calculating the gravitational and elastic potential energy of various objects based on their mass, height, spring constant, and displacement from equilibrium.
work_energy_and_power.ppt
The document defines work, energy, and power. It explains that work is the transfer of energy by a force acting on an object, and is calculated as work = force x distance. It also discusses different types of energy including kinetic, potential, and chemical energy. Power is defined as the rate of work done or energy transferred, and is calculated as power = work / time. Examples of calculations involving work, energy, and power are provided.
Work, energy & power physics
This document covers concepts related to work, energy, and power. It begins by defining work as the mechanical transfer of energy due to external forces, and is equal to the product of the force and the displacement in the direction of the force. Various examples are provided to illustrate situations where work is and isn't being done. The relationship between work and energy transfer is explained. Kinetic and potential energy are introduced, and analogies are provided. Methods for calculating work, energy, and power are demonstrated through examples.
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.
2.3 work, energy & power 2017
1) Work is done when a constant force acts upon an object, causing its kinetic energy to change. Work can be calculated as the product of the force and displacement (W=Fs).
2) Kinetic energy is defined as half the mass of an object multiplied by its velocity squared (Ek=1/2mv^2). Potential energy depends on an object's position or state and is defined as mgh for gravitational potential energy.
3) Energy is always conserved in an isolated system. As one form of energy decreases, another form increases such that the total energy remains the same. Machines can convert energy into useful work but some energy is always lost to heat.
Ch 6 Work & Energy
This document provides an overview of key concepts in work, energy, and power. It defines work and explains how to calculate work done by constant and variable forces. It introduces the concepts of kinetic and potential energy, and establishes the work-energy theorem. It distinguishes between conservative and non-conservative forces, and explains how the conservation of mechanical energy applies or does not apply in different situations. It also defines power and provides examples of calculating power.
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2.1 energy
Kinetic and potential energy are the two main classifications of energy. Kinetic energy is the energy of motion and is measured in Joules, while potential energy is stored energy due to an object's position or state. Examples given include the potential energy stored by lifting a mass to a height (PE=mgh), and the kinetic energy of a moving object (KE=1/2mv^2). Energy exists in many forms but is never created or destroyed, only transferred or changed from one form to another.
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1 work
- 1. WORK AND CONSERVATIONWORK AND CONSERVATION OF ENERGYOF ENERGY STYMVERLY GAWAT JENERUS JUAN AND ALWEN AGYAM
- 2. Work is the transfer of energy through motion. In order for work to take place, a force must be exerted through a distance. The amount of work done depends on two things: the amount of force exerted and the distance over which the force is applied. There are two factors to keep in mind when deciding when work is being done: something has to move and the motion must be in the direction of the applied force. Work can be calculated by using the following formula: Work=force x distance WorkWork
- 3. Work is done on the books when they are being lifted, but no work is done on them when they are being held or carried horizontally. WorkWork
- 4. Work can be positive orWork can be positive or negativenegative • Man does positive work lifting box Man does negative work lowering box Gravity does positive work when box lowers Gravity does negative work when box is raised
- 5. Work done by a constant ForceWork done by a constant Force θ ∆Ekin = Wnet • W = F s = |F| |s| cos θ = Fs s |F| : magnitude of force |s| = s : magnitude of displacement Fs = magnitude of force in direction of displacement : Fs = |F| cos θ θ: angle between displacement and force vectors • Kinetic energy : Ekin= 1/2 m v2 • Work-Kinetic Energy Theorem: F s
- 6. Conservation of Mechanical EnergyConservation of Mechanical Energy Total mechanical energy of an object remains constant provided the net work done by non-conservative forces is zero: Etot = Ekin + Epot = constant or Ekin,f+Epot,f = Ekin,0+Epot,0 Otherwise, in the presence of net work done by non-conservative forces (e.g. friction): Wnc = Ekin,f – Ekin,0 + Epot,f-Epot,i
- 7. Example ProblemExample Problem Suppose the initial kinetic and potential energies of a system are 75J and 250J respectively, and that the final kinetic and potential energies of the same system are 300J and -25J respectively. How much work was done on the system by non-conservative forces? 1. 0J 2. 50J 3. -50J 4. 225J 5. -225J correct Work done by non-conservative forces equals the difference between final and initial kinetic energies plus the difference between the final and initial gravitational potential energies. W = (300-75) + ((-25) - 250) = 225 - 275 = -50J. Samar HathoutSamar Hathout
- 9. Conservation of EnergyConservation of Energy Conservative forces: • Gravity, electrical, QCD… Non-conservative forces: • Friction, air resistance… Non-conservative forces still conserve energy! Energy just transfers to thermal energy PEf + KEf = PEi + KEi ∆KE = −∆PE Samar Hathout
- 10. ExampleExample A diver of mass m drops from a board 10.0 m above the water surface, as in the Figure. Find his speed 5.00 m above the water surface. Neglect air resistance. 9.9 m/s
- 11. ExampleExample A skier slides down the frictionless slope as shown. What is the skier’s speed at the bottom? H=40 m L=250 m start finish 28.0 m/s
- 12. ExampleExample Three identical balls are thrown from the top of a building with the same initial speed. Initially, Ball 1 moves horizontally. Ball 2 moves upward. Ball 3 moves downward. Neglecting air resistance, which ball has the fastest speed when it hits the ground? A) Ball 1 B) Ball 2 C) Ball 3 D) All have the same speed.
- 13. Springs (Hooke’s Law)Springs (Hooke’s Law) Proportional to displacement from equilibrium F = −kx
- 14. Potential Energy of SpringPotential Energy of Spring ∆PE=-F∆x ∆x F ∆PE∑ = 1 2 (kx)x PE = 1 2 kx2
- 15. x ExampleExample b) To what height h does the block rise when moving up the incline? A 0.50-kg block rests on a horizontal, frictionless surface as in the figure; it is pressed against a light spring having a spring constant of k = 800 N/m, with an initial compression of 2.0 cm. 3.2 cm
- 16. PowerPower Average power is the average rate at which a net force does work: Pav = Wnet / t SI unit: [P] = J/s = watt (W) Or Pav = Fnet s /t = Fnet vav
- 17. ExampleExample A 1967 Corvette has a weight of 3020 lbs. The 427 cu-in engine was rated at 435 hp at 5400 rpm. a) If the engine used all 435 hp at 100% efficiency during acceleration, what speed would the car attain after 6 seconds? b) What is the average acceleration? (in “g”s) a) 120 mph b) 0.91g
- 18. ExampleExample Consider the Corvette (w=3020 lbs) having constant acceleration of a=0.91g a) What is the power when v=10 mph? b) What is the power output when v=100 mph? a) 73.1 hp b) 732 hp (in real world a is larger at low v)