Introduction to the concept of trajectory A trajectory is a path followed by an object with mass in curvilinear motion (curved path)  as a function of time. Mathematically, It is defined by the equation in x-y coordinates. A famous example would be projectile motion like the ball thrown at an angle or a bullet fired

You must have ride Roller coaster or ferris wheel in the amusement park. Its up and down and moving in the circle must have thrilled and fascinated you Today I would like to give a brief details about those machine and how you feel different in those rides. So this article is about the Physics of Amusement Park’s.

ADVANTAGES
The generation of A.C. is cheaper than that of D.C.
A.C. machines are simple , robust and do mot require much attention for their repairs and maintainance during their use.
Wide range of voltages are obtained by the use of transformer.

In this article, we would learn about charge density and its formulas and would also solve some problems related to this concept. We encounter electric charge density while calculating electric field from various continuous charge distributions like linear, surface and volume. We also need the concept of charge density while studying current electricity. What is Charge Density?