In this chapter, we will introduce a new concept--energy--that is one of the most important unifying concepts in all physical science. It's importance stems from the principle of conservation of energy.
The Quantum Foam
Brian Greene, The Fabric of the Universe
This rapidly moving surfer has kinetic energy, or energy of motion, because the wave, in accelerating him to his present speed, has done work on him. This chapter discusses the relationship between work and kinetic energy.
Work = The product of the component of the Force in the direction of the displacement
Work (Joules) = Force (N) x Distance (m)
more forces acting
on the sled?
Mars Explorer
Since the first humans climbed out of the trees, humans have utiliized the transfer of energy concept as a means to make sense of their world or other worlds.
What is the final speed of the downhill skier if his mass = 58 kg, his initial velocity = 3.6 m/s,
the frictional force = 71N on the skiis and the distance traveled down the slope s = 57m?
Mechanical Universe
click below
Energy Methods instead of the
motion equations
Animated Problem 101
