Aim: How do we relate work and energy?

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Presentation transcript:

Aim: How do we relate work and energy? Do Now: Quiz HW: Problem Set

Demos Pulling Christian around the room. Christian lifting up his desk Christian holding his desk Christians desk sitting there without Christian Work done No Work

Work Work: Energy transferred by a force. Energy: Ability to do work Unit: Joule (J) W = FIIdCosθ=ΔET Nate pulls Christian 20 meters with a rope at a 30o angle and in doing so applies a force of 10 Newtons. How much work does he do?

Force on an incline W = FIId (200 N x 10 m) = 2000J 50 N x 10mCos(180o) = -500J -500 J is the work done against friction. Notice the angle is 180o between the FF and distance travelled! 500 J of Bobs 2000 J of energy is put into fighting friction. Lets say Bob pushes a crate up a 40o incline with a force of 200 N for 10 meters. The force of friction is 50 N. How much work is done against friction?

Gravitational Potential Energy (PEG) Gravitational Potential Energy: An object has the ability to do work when raised to a certain height with gravity. How does our PEG on this floor compare to Mr. Trombetta’s PEG? We have more since we are higher up! PEG = mgh

Kinetic Energy Kinetic Energy: An object in motion has the ability to do work (Energy in motion). If I ask you to put a lot of energy into a throw. What is going to be the result? More speed = More energy Lets say I drop a basketball and a golf ball from the ceiling. Which will have more energy? The larger one, it has more mass KE = (1/2)mv2

Energy of a 3.6 kg bowling ball Using a timer, determine how long it takes the ball to fall and then determine the balls height and final speed. What is KE max and PEG max? About 3 sec….