Electricity, gravity and magnetism are all examples of non contact forces. A force is anything that can cause a physical change in an object.Continue Reading
Forces are always defined as either contact or noncontact. Contact forces need to have at least two different objects touching each other to work. They must be able to work together to create physical change. Friction is one of the most common contact forces and can be seen in everything from automobile tires to the way sparks come out of butane lighters. For a force to be considered contact, it must touch something else that makes the force happen.
A noncontact force occurs when the force acts from a distance. An example of a small noncontact force is a refrigerator magnet. This type of magnet is attracted from a distance but will not be able to work from long distances. A larger noncontact force is gravity. Gravity functions from a very long distance but can still have a pull on things that are within the earth due to the strong reactions that it causes. No matter the distance, a force that can cause physical change without physically touching something is a noncontact force.Learn more about Physics
The specific gravity of mercury is 13.6. Specific gravity is also called relative density and is the ratio of the density of one substance to that of a standard substance such as water. Density is an object's mass per unit volume.Full Answer >
Assuming the stone starts from rest and air resistance is negligible, the depth of the mine shaft can be found by solving the equation x = 1/2 at^2, where "x" is distance, "a" is acceleration due to gravity, and "t" is time. The answer is 176.4 meters or 588 feet.Full Answer >
Mass and weight are closely related because mass affects the weight of an object experiencing the effects of gravity. Weight is the measure of the force of gravity on an object's mass, while mass is the measure of how much matter there is in an object.Full Answer >
Einstein's Theory of Relativity is his interpretation on how matter and energy are related, as well as the properties of the fabric of spacetime with respect to gravity. The General Theory of Relativity mainly covers the behavior of the fabric of spacetime around matter, because all matter has mass and therefore gravitational pull. The Special Theory of Relativity addresses the speed of light.Full Answer >