Kinetic Energy( It Moves!)

In yesterdays class we learned more about energy and its different forms. We learned that

• Kinetic Energy (Ek) is the energy of motion
• Potential Energy (Ep) it the energy of rest
• Change in energy = Final Kinetic Energy - Initial Kinetic Energy (if on a level surface)
• Work = change in kinetic energy
• Ek = 1/2mv^2
• kinetic energy is a scalar quantitiy
• its SI unit is Joules(J)

ex. 1 If an 8.0 kg mass moves at 35m/s what is its kinetic energy?

Ek = 1/2(8.0kg)(35m/s)^2  Ek = 4900J

We also learned more about collisions.

• An Elastic Collision is when there is no loss of energy.(rarely happens)
• An Inelastic Collision is when there is some energy lost 
• An Completely Inelastic Collision is when two objects stick together