Fizzix : Work, Kinetic Energy, Gravitational Potential Energy

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Presentation transcript:

Fizzix 7.1-7.3: Work, Kinetic Energy, Gravitational Potential Energy Jenna Restieri and Amy Wyle

7.1: Work whenever work is done, energy is transferred W=FdCosθ W: work d: displacement of system θ: angle between force vector F and displacement vector d when θ=180, Cosθ=1, W=Fd W is measured in Newton-Meters (joules)

Scientific Definition... The “work” done on a system by a constant force is the product of the component of the force in the direction of motion times the distance through which force acts.

LAB!!! Pick up a pencil. Turn around in your chair. Measure d, F, and θ. Calculate the work done on your pencil using the given formulas.

NO WORK DONE!

7.2: Kinetic Energy and the Work-Energy Theorem net work - work done by external force (Fnet) Wnet= Fnet d cos θ Wnet= m a d Wnet= m ( ) d Wnet= ½ mv^2-½ mv1^2 KE=½ mv^2

Kinetic Energy Kinetic Energy is a form of energy associated with the motion of a particle, single body, or system of objects moving together

7.3: Gravitational Potential Energy everyday work is different from scientific work climbing stairs or lifting objects is both everyday and scientific work done against the gravitational force when the force does positive work, it increases the gravitational potential energy

Potential vs. Kinetic Energy if a mass is released, gravitational Force will do an amount of work “mgh,” increasing kinetic energy by that same amount PEg → KE PEg = mgh applies to any path with change of height “h” any change in vertical position “h” of mass “m” is accompanied by PEg of mgh lets us avoid calculating work done by/against gravitational force

More 7.3 work done in lifting an object of mass “m” through height “h” when lifted straight up at a constant speed… F=mg W=Fd=mgh

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