Work, Kinetic Energy, Potential Energy & Springs ~ Conservation of Energy
Some definitions:
Work and Kinetic Energy video
In 1996, Paul Tracy, while riding in his Indie Car that had a mass of 711 kg, was able to achieve a world record velocity of km/h. What was his kinetic energy at that time? P 290 – Q 2, 3, 4
Potential Energy video 2 nd Potential Energy video
Spring Energy video 2 nd Spring Energy video 3 rd Spring Energy video 4 th Spring Energy video 5 th Spring Energy video
InitialFinal √x xx x√ xx A question will dictate which energies are involved. We must consider ALL types of energies in a problem, so that nothing is forgotten. This little table helps to remind you of all the energies as a check-list. The long equation above is greatly simplified in the next step thanks to this table.
A 3.0 kg watermelon is dropped from a building that is 48.0 m tall. Neglecting air-resistance, what is the speed of the watermelon just as it strikes the ground? Does the mass of the melon matter? InitialFinal x√ √x xx xx
A 2.0 kg block is sliding on a level, frictionless surface when it encounters a spring bumper. The spring has a spring coefficient of 62 N/m and is compressed 4.80 cm. How fast was the block moving? InitialFinal √x xx x√ xx
Page342. Questions: 29, 32, 36, 52, 54
Spring Energy Discoveries in physics Drop Feather and Hammer Energy Review 2 nd Potential Energy video