Friction is caused by the bumps on the surface of one object colliding with the bumps of another object's surface. All surfaces have bumps, created by their molecular structure. These bumps may only be visible on objects with seemingly smooth surfaces through the use of a microscope.
There are two types of friction: static and kinetic. Static friction occurs when objects are not moving. The resistance encountered when trying to push a heavy object across a surface is an example of static friction. Kinetic friction occurs as two objects rub against each other. Kinetic friction produces energy in the form of heat.Learn More
A Venturi pump uses the kinetic energy in a fast-moving fluid to move another liquid or semi-liquid substance. These pumps are abundant in sewage treatment plants because they reliably move large volumes of thick, heterogeneous material without clogging or locking. Venturi pumps are also useful in quarries, refineries and other industries that generate thick liquid waste.Full Answer >
Solids maintain a definite shape and volume because their atoms are tightly bound to each other. Solids can be crystalline or amorphous. In crystalline solids, such as ice and metal, atoms are arranged in a regular geometric lattice. In amorphous solids, such as wax and many plastics, the arrangement is irregular.Full Answer >
Force and motion are related because exerting force on an object causes a change in motion. An example would be kicking a ball to propel it forward. Two examples of natural forces are gravity and magnetism.Full Answer >
Isaac Newton's theory of gravity states that every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. The law is represented as: F=G (m1m2)/R.Full Answer >