Thank you. I new there were smart people in this forum.
Nothing wrong with asking questions.
It's just some people will assume you're trolling if they expect anyone who stops by to know the answer to what is being asked.
One of the great realizations of physics (largely brought together by Newton) was that energy was interchangeable and quantifiable. That you can convert gravitational potential energy, kinetic energy, heat, electricity, and countless other things between forms and end up with a quite predictable amount of energy on the other end. That you could determine energy from force times distance. That you could get force from mass times acceleration. A series of simple equations allowed for an immense wealth of calculations toward understanding our universe.
One of the unavoidable laws of the universe is entropy, often stated that the universe tends toward disorder (but physics has a very specific definition of "disorder"). All reactions/conversions must increase entropy - and in practice, this generally means "some of the energy turns into heat", which increases entropy. So every time you convert, you lose. And if you want to turn the heat back into electricity, you still have to have a net overall increase in entropy, which in practice limits you to Carnot's law - all heat engines have a maximum possible efficiency based on the difference in temperature between the hot and cold side of the heat engine. This, by the way, is the main reason why electric motors can approach 100% efficiency but internal combustion engines are generally under 50% efficient, and commonly well less.
So we try to avoid converting energy whenever we can, and just use it directly!
There are, however, times when you may
want to convert energy. A good example is hybrid cars. Internal combustion engines vary widely in efficiency. Their maximum efficiency is when run at high torque, low RPM. Outside of that and their efficiency plunges off a cliff. So for a hybrid car, they downsize the engine (meaning that it spends most of its time operating closer to its maximum torque) - but then so that it's not underpowered, they pair it with an electric motor to boost it in hill climbing, acceleration, etc. The battery for this motor is in part charged by regenerative braking, but also by a generator (the motor itself, being spun by the engine). Generating power puts more torque load on the engine, and is particularly done when the engine is otherwise in low torque conditions. In short, a hybrid keeps its engine in high torque, low RPM conditions for much more of the time, and thus operating much more efficiently - and this added efficiency readily overcomes the extra losses incurred by changing the form of energy from motion to electricity and back to motion.
Whenever you think about the topic of energy generation and use, always think about what you're converting, how much you lose, and what the effects will be. For example, let's say that someone says "I want to put pads on the road such that, as cars drive over them, it pushes them down, turning a generator." Is that a good idea? Well, let's ask ourselves, where is the energy really coming from? Because remember, it never just appears. The answer is, of course, it's actually coming from the cars. How? Because each time the car pushes the pad down a bit, it's now a bit lower than it was before. Height is a form of potential energy. To restore its height (for example, as it moves into the next pad), it is effectively driving uphill, and thus working their engines harder. So you're just taking energy from the cars and making them burn more gas**. Probably not what the person who proposed it wanted!
*** ... Unless, of course, you're pushing the engines on average into a higher torque regime which, while they will burn more total energy, the increase in efficiency means more energy is being recovered by the pads than the cars are burning extra in gasoline! How is that possible? The efficiency of a combustion engine is the ratio of how much of the energy of the fuel is converted into motion vs. to heat. So if you're boosting the efficiency by making the cars work harder, that just means that just means that you're getting more of the energy as useful work rather than heat, and that's where the extra energy you're capturing is coming from.