Reflection: Work needs force and displacement. The force should be parallel with respect to displacement. There’s three conditions of work. First there must be a force acting on the object. Then, the object has to move a certain distance called the displacement. Lastly, there must be a component of the force in the direction of the motion.
Power is the rate doing work. This is measured in joules per second (J/s) or watts (W).
Concepts: The concepts that I learn in these lessons are whenever you do something, you are applying work and power. There is always a work and power in every movement that we do. To find the formula of work, you need to multiply force to displacement (W= Fd). Then to find the force, you need to divide work to displacement (F=W/d). Lastly, to find the displacement, you need to divide work to force (d=W/F). You can easily remember all of these by using the “magic triangle”. Nextly to find the formula of power, you need to divide work to time (P=W/t).
Application in life: If I am pushing a cart from rest, I am applying work. This is because I apply force to the cart, so that the cart can move, but if I didn’t apply force to the cart, the cart stays at rest. There’s no motion. Then in power, if my brother and I are running and racing to each other until at the finish line, we are applying power. This is because we are applying strength to reach the finish line. We are releasing speed, so that we know who is faster.
brandonbl0gz 