Can some1 help me with my physics?

Question

We need to talk about the law of conversation of energy and how it applies to 3 different types of physics

um the question says

We discussed energy in many different aspects of the world. I need to use examples from class but i dont no what to do lol

we talked in class about circuits(lightbulbs,engines,generators,transformers,and some other stuff)

we talked about motion
(acceleration,velocity and what not)

we talked about friction

and some other stuff

Answer 1

I don't know much about energy conversation so let me offer my little knowledge about energy conversion.

a) let's say we have a block of mass m that slides down an inclined (makes an angle A with a horizontal) and is being subjected to a friction force f that has a coefficient of kinetic friction u.

Energy equation
The potential energy Pe on top of the inclined is converted to kinetic energy Ke and work done against friction at the block reaches the bottom of th e incline.

Pe=Ke+Wf or
mgh=(1/2)mV^2 + umgS where

h - height of the starting point
S- total length of the inclined
V- speed of the block when h=0 (at the bottom)

b) Example using electricity
1 Mechanical energy is converted to electrical energy,
2Electrical energy passing trough a lamp's filaments convented to heat
3. As the filament heats up the heat is converted to light
4. One can use that light and photoelectric cell to convert light to electricity.