Who studies laws of matter and motion?

Frequency for UV waves? Water is light in colour and transparent if you drop it on an object the object becomes dark Why? What kind of matter is electricity? What are the 50 words of vector and their magnitude and direction? What does it mean to decelerate? Heat from burning fuel warms the walls of the firebox section of the furnice in? What are the characteristics of infrared rays? What is the object to be lifted by the lever called? What are the different methods in adding vectors? Why is there less energy available you go up energy pyramid? What sound does a typewriter make? What changes occurred as a result of Albert Einstein's work? Do reactions create energy? What force pulls you up? Which alternitive energy source is exhaustable? A force that causes a change in an objects motion? What does a meterphor mean? What waves are used in MRI machine? What are other ways to improve time and motion in making-up bed? Are impulse and momentum the same thing?

Who studies laws of matter and motion?