MCAT Physical
A comprehensive introduction to the fundamental concepts of physics as tested on the MCAT, including mechanics, thermodynamics, electricity, and more.
Work, Energy, and Power
Making Things Happen: Energy and Power
Physics isn't just about moving—it's about making things move! Work, energy, and power describe how you make things happen.
Work
Work is done when a force moves something. It's calculated as:
\( W = Fd \cos\theta \)
where \( \theta \) is the angle between the force and the direction of movement.
Energy
- Kinetic Energy: Energy of motion (\( KE = \frac{1}{2}mv^2 \))
- Potential Energy: Stored energy due to position (\( PE = mgh \))
Power
Power is how quickly work is done:
\( P = \frac{W}{t} \)
Why It Matters
Every time you climb stairs, pedal a bike, or charge your phone, you're dealing with work, energy, and power!
Examples
Lifting a box onto a shelf requires work against gravity.
A light bulb uses electrical power to produce light and heat.
In a Nutshell
Work transfers energy, and power measures how fast energy is transferred.