What's the best topic to do a research paper about it?

Off the top of my head…How about how Newton and others figured all of those things out? Or how these “tools” are useful in the real world?

@Christian95 I hope you are more careful with spelling and grammar in your paper than you were in your question.

The right topic is the one that most interests you and on which you can find good and diverse sources of information.

Remember that research papers require special ways of presenting your information.

Paraphrasing or rewording what your sources already say is cheating and shows laziness and dishonesty.

Write the paper as well as you can in your own words.

I’ve always liked block pulleys. They are easy to use in experiments and fun to work with.
That is just my preference.

How effecient is solar energy?

How fast does cum ejaculate from the penis?
Do some experiments too.

@RAWRxRandy Someone I knew once wrote upon this.

I suggest investigating the effects of forces upon a body at rest. Namely your body. Easiest thing you’ll ever do.

Bacon.

How about demonstrations of Newton’s Laws on a pool table? Lots of equations and diagrams.

The obvious choice is going to be siege weaponry.

@The_Idler
Shooting bacon.

Deliberations on Delicious Ballistics, by Chris 95. That would be one badass research paper.

Obviously you can’t do anything too elaborate. Maybe discover and explain the optimal launch angle of a projectile for distance..

Leaving behind light and Mirror (which comes under optics) the rest you have mentioned, comes under a broadly classified topic known as “Mechanics”.Each and every component of mechanics are interrelated.You can’t go for a a research paper on pulley puting aside Newton’s Laws of Motion.Force,acceleration,mass,velocity are all components of mechanics.
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You could choose any of the part and go for it.Elasticity is a good topic.You could describe the different coefficients of elasticity like ,Young’s Modulus,Bulk Modulus etc and their physical significance along with the effects on them due to temperature and pressure variation.If you are considering pulley systems,you could show different types of pulley systems and their resultant effect in reducing effort.Along with pulleys, you could make use of elastic properties of matter if you are considering an elastic cable which is supposed to change shape and size,but that would be a little bit complicated,but it doesn’t mean it’s not doable for you.If you are able to do it,it would make your research a distinguished one at your level.
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Finally mechanical work,power and efficiency.Till now the best possible mechanical efficiency achieved in case of machines is upto a maximum of around 50 to 60%.You could give some suggestions to improve the efficiency.Don’t bother if that would be accepted or not,but you should try to render new ideas.Most of the time we don’t speak because, we think it might get disapproved or rejected and that way new ideas stop flowing across.
If you need some hint regarding improvising efficieny, then
1.Controlling heat loss
2.Controlling sound and hum of moving parts by making moving parts more aerodynamically efficient.
3.Controlling vibrations
are the areas to focus upon.Go ahead and make your mark.If you need anyhelp at any point of time,I’ll be happy to render any sort of support I could.Best wishes.

The most important thing in writing almost anything is to consider the intended audience. Who is the intended audience of this paper? Your teacher: it’s for grades and you want it to be good (so, intended audience is especially important). Applied to your question, this means: What topic would your teacher think is a good one? Ask your teacher for topic suggestions, places to begin your work, sample essays, etc.

Another way to brainstorm ideas for a paper is to look at the resources you have to work with. For example, you listed some subjects that interest you (speed,velocity,force,Newton laws,reflection and refraction of the light,mirrors,energy,simple mechanisms,mechanical power,efficiency,mechanical work,elastic force), now choose one and search for information about it in the resources you’re allowed to use (school text? library? internet?). If you don’t find much information, move on to the next subject and search for it. When you find information on a subject, scan through it and see what jumps out at you. Maybe you’ll have a question about something, or you’ll notice something interesting, like a characteristic or pattern – something that will suggest a topic for your paper. If nothing jumps out at you, move onto the next subject search.

If you want this paper to be good, you should ask your teacher for feedback once you settle on a topic. A mistake this early in the game can ruin everything.