Physics
High School (11–12)
Mechanics › Work, Energy and PowerMechanics › Momentum and CollisionsChapter 5Work, Energy and Power
A roller coaster climbs slowly, and then it races down. A bat hits a ball, and the ball flies away. A motor lifts a load in one minute, and a bigger motor does it in ten seconds. In each case, energy goes from one place or form to another. In this chapter we learn what work is, how it changes the motion of a body, how energy is stored and kept, how fast work is done, and what happens in a collision. Python adds up the work, draws the energy graphs and solves the collisions.
Part of Physics · High School (11–12) (chapter 5)
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Work and Kinetic Energy
You carry a heavy bag along a level road. Are you doing work? In physics, the answer may surprise you. In this course we define work with the scalar product of two vectors, we find that work changes the kinetic energy of a body, and we learn to find the work of a force that changes along the path, as the force of a spring does.
Potential Energy and Conservation of Energy
A stone held high, and a spring that is pressed, can both do work when we let them go. In this course we find which forces store energy and which do not, we write the potential energy of gravity and of a spring, and we use the conservation of energy to solve problems with slopes, pendulums, roller coasters and rough floors.