Physics Notes Essays - Physical Sciences, Natural Sciences

Physics Notes: An object at rest will remain at rest, and an object in motion will continue in motion at constant velocity in a straight line unless acted upon by an outside force. The change in motion of an object is proportional to the ratio of the net force to the object's mass. For every action there is an opposite but equal reaction. Instead, Einstein reasoned that all motion was relative and that only the speed of light was constant. Einstein's special theory of relativity, published in 1905, explained that nothing could travel faster than light, and that, if an object approached the speed of light, time would slow, the object's mass would increase infinitely, and its length would shorten. In 1730, French scientist Charles du Fay described the existence of positive and negative charges. In1750,Benjamin Franklin concluded that electricity was caused by the flow of an electrical fluid. In 1780, Charles Coulomb showed that electrical forces decreased as the square of the distance between two electrical charges. In 1800 Alessandro Volta created the voltaic pile, which produced electric current. He correctly described the principles of attraction and repulsion between magnetic poles and how the earth was like a magnet.In 1750, John Michell showed that the force of repulsion between like magnetic poles decreased with the square of the distance between them. Benjamin Thompson (Count Rumford) showed that heat was not a fluid, as people had previously hypothesized Thermodynamicsthe movement of heat Old ideas are challenged and tested, which leads to new ideas. The number of discoveries increases as the number of scientists involved increases.The number of scientists working in physics has increased since ancient times. Available technology can drive physics discoveries or develop from them. Governments can be important in coordinating projects like expensive particle accelerators. Physics is an ongoing process.