Episode 6 — Mechanics - Work, Energy and Power

Problem Solving

Learners will be able to:

• Calculate the power of a pump that raises 30 kilograms of water per second from a depth of 5 meters and discharges at a speed of 12 meters per second. • Determine the work done by friction in the system described above. • Use the formula P = F × v to calculate the average power used to drag a box across a rough surface at a constant speed. • Calculate the total work done on an object using the formula W = ΔE, where E is the change in mechanical energy. • Apply the definition of work to solve problems involving forces and displacements, including those with inclined planes. • Use the work-energy theorem to calculate the work done by gravity on a block sliding down a frictionless inclined plane.