Module 3: Waves and Thermodynamics

Average Power

What is average power?

In this post, we conduct investigations over a range of mechanical processes to analyse qualitatively and quantitatively the concept of average power P = \Delta E \Delta t, P = F||s = Fvcos(\theta) , as a part of the Prelim Physics course under the module Dynamics and sub-part Forces, Acceleration and Energy. We take a look at uniformly accelerated rectilinear motion, objects raised against the force of gravity, and the work done against air resistance, rolling resistance and friction. Average power is the average amount of work done or energy converted per unit of time.


The following three videos introduce you to the concepts of average power and related formulas. In the first video, you are introduced to the theory behind power, and in the second two, you are guided through power questions and how to use the formulas to solve them.


Part 1: Power


Part 2: Introduction to Power


Part 3: Average power exerted by a speeding car up an inclined plane