Hobbies And Interests
Distance
Distance is one of the most important physical measurements. It allows mankind to give a scale to the size of the planet, the distance to the sun and the radius of atoms. Distance can be measured in many different ways, but the most common is through the use of a ruler. This is a device with markers indicating incrementing length. The international standard unit of length is the meter.
Time
Time is another quantity which is of fundamental importance in physics. Time began at the beginning of the universe in a process known as the "Big Bang." Physical measurements of time vary from the very long such as the age of the universe to the very fast, such as the speed of electrons flowing through metals. In everyday life, time is measured using clocks and stop watches. More accurate measures of time rely on the radioactive decay of certain elements, and these are known as atomic clocks. The international standard unit of time is the second.
Force
There are four forces of nature, and these shape the universe, the world, and the everyday environment. The four forces are gravity, electromagnetic, weak, and the strong. The magnitude of a force can be calculated from Newton's second law, which states:
Force = mass x acceleration
Force is typically measured indirectly by measuring the mass and acceleration independently. The international standard unit of force is the Newton.
Energy
Energy is one of the most fundamental concepts in physics, and it is a conserved quantity (it cannot be created or destroyed). There are many different types of energy, such as gravitational energy, electrical energy, and kinetic energy. Different types of energy are measured in different ways. For example, kinetic energy is associated with movement. Kinetic energy can be calculated using the formula:
Kinetic Energy = 0.5 x mass x velocity^2
The international standard unit of energy is the Joule.