Problems with Vectors at an Angle
Why angles matter in physics Many physical quantities depend not only on the size of a force, but also on its direction. A force can be resolved into components, produce a turning...
04 Energy and Fields
Perpetual Motion Engines
This is the best video I have come across so far that is used to introduce the idea of perpetual motion engines and why it violates the principle of conservation of energy.
Work Done Simulation
This GeoGebra app allows users to change the magnitude and direction of the force acting on an object, as well as the initial velocity. The change in kinetic energy is calculated...
Work-Energy Theorem - key concepts
Answer to question: Work done by external forces (excluding gravitational force) is negative. Since [latex]E_k=\dfrac{GMm}{2r}[/latex] for satellites in orbit (where G is the...