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Power, Work and Energy Physics January 2 and 3

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Objectives Define and Describe work, power and energy Evaluate how work, power and energy apply to the real world Solve for work, power and energy

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What is work? Topic Work Facts The application of a force and the movement of something by that force (distance) Work = force x distance W = Fd – F = force (N) – d = distance (m) – W = work (J)

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Now think about the math of work Topic What do you need to find work? What will the units for work be when solving? What would you do if given the mass and distance to find work? Facts Force (N) Distance (m) Joules (J) First use the mass to find for (F = w = mg). Then use the F and d to solve for work

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What about Power? Topic Power Facts The rate at which work is done Units are watts (W) Power = work time Power = W/t – W = work (J) – t = time (s) – Power (W)

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Consider the math with Power Topic To solve for power, what do you need? How do you find work if it is not provided? Facts Work and time Multiply force and distance

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What is Energy? Topic Energy Facts The “something” that enables an object to do work Measured in Joules (J) We will focus on mechanical energy

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What is Mechanical Energy? Topic Mechanical energy Facts 1.Potential energy – The energy due to the position 2.Kinetic energy – the movement of something

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Potential Energy Topic Potential energy Facts Energy stored and held in readiness – Something at rest – Something high off the ground Symbol is PE Units are Joules (J) PE = mgh – m = mass (kg) – g = gravity (10 m/s 2 ) – h = height/distance (m) – PE= potential energy (J)

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Kinetic Energy Topic Kinetic energy Facts Energy of motion Symbol is KE Units are Joules (J) KE = ½ m(v 2 ) – m = mass (kg) – v = velocity (m/s) – KE = kinetic energy (J)

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Work-Energy Theorem Topic What is the relationship between work and energy? Facts Whenever work is done, energy changes Work = change in Energy

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Conservation of Energy Topic When is energy conserved? Facts ENERGY IS ALWAYS CONSERVED! Energy is transferred from PE to KE and vice versa

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Closing Topic What is energy and how does it relate to work and power. Be sure to use the following terms in your explanation KE PE Work Power Facts

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