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Section 2: Kinetic Energy & Potential Energy
Lockheed Martin completes final test flight of its hyper-velocity kinetic weapon
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400 meter in diameter and 19,000 mi/hr (4000 Megatons) (video on files)
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Video:
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Kinetic Energy = Energy of a moving object
KE = 1/2mv2 Sample Problem: Find the KE of a moving car with the following parameters
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Conceptual Question: To increase the KE, is it better to increase the mass or speed and why?
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Work Kinetic Energy Theorem
A fellow pushes a 1000kg car with 20N for 5 meters. Find the cars kinetic energy?
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Gravitational Potential Energy (PEg)
PEg = mgh Demo: Bucket of bricks at different heights .
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Technology Applications
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Elastic Potential Energy (PEe)
PEe = 1/2kx2 Find the Following: A sling shot has a spring constant of 2 N/m. Find the energy stored in the band if it is pulled back to 1 meter. Find the energy in the band if it is pulled back to two meters. 3) Find KE of the rock when it is shot after being pulled back to 2 meters. Demo: Block on elastic band for different lengths.
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Mixed Problem Find the kinetic energy of a 1000kg car that is traveling 30m/s? 2) If the same car is to coast up a hill, how far can it vertically make it? 3) How far must a sling shot be pulled back to have the same energy as the car in problem number one of it has a spring constant of 90N/m?
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Reflection Problem: A 10kg cart is pushed with a force of 20N for 5 meters. Use this information to find the missing potential energies , kinetic energies, heights and speeds for the following trip.
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Warm-up: A car is traveling at a certain speed and it take 25 meters to stop the car with a constant force of 10N. Find the energy to stop the car.
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Warm-up: A 1000kg rocket car is pushed with a force of 2000N for 200 meters. Find the following
Work done on rocket: Type of energy the work turned into: 3) Kinetic energy of rocket: 4) Velocity of rocket:
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Energy Quiz (5pts each) Find the kinetic energy of rocket that has a 30N force applied to it for 20 meters. What is the kinetic energy of a 1000kg meteor traveling at 9000m/s? How much energy is required to lift a 300kg object 15 meters. Find the elastic potential energy of a rubber band that has an elastic constant of 30N/m that is pulled back 2m.
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Quiz: A student pulls down
Quiz: A student pulls down .2m on a rubber band and records a force of 29N. Find the following: 1) Spring Constant: k=F/x 2) Energy stored in rubber band. 3) If released, what type of energy will it turn into? 4) Find how high the rubber band will go.
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