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What is energy? What types of energy do you know?

What is energy? What types of energy do you know?

Energy is the scalar physical quantity that is a single measure the various forms of motion and transition measure the motion of matter from one form to another. Mechanics distinguishes between potential energy and kinetic energy. Potential energy is energy of interaction of bodies or their parts to each other or with external field. Kinetic is energy of motion. Their sum is called the total energy.

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What is a simple definition of machine? Give a few examples of very simple machines.

A simple machine is a mechanical device that changes the direction or magnitude of a force. In general they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force.

A lever is a simple machine that consists of a rigid object and a fulcrum (or pivot). A wheel is a circular device that is attached to a rigid bar in its center. An inclined plane is a plane surface set at an angle to another surface.

A wedge is a double-inclined plane (both sides are inclined) that moves to exert a force along the lengths of the sides.

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What is a machine tool? Describe its functions.

A machine tool is a powered mechanical device, typically used to fabricate metal components of machines by machining, which is the selective removal of metal. The term machine tool is usually reserved for tools that used a power source other than human movement, but they can be powered by people if appropriately set up. The functions of machine tool are processing of wood, metal and manufacturing of various parts and devices.

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What is the principal purpose of bearings? What types of them do you know?

The purpose of a bearing is to reduce friction, most often on a rotating shaft. It may be made of many different materials including sintered bronze, which holds oil to reduce friction, and various metals which are cast in place to make a soft slippery surface for really heavy shafts. A bearing can also use balls or rods between two hardened metal surfaces, the balls or rollers convert what would be a sliding contact to a rolling point contact.

Ball bearings, plain bearings are probably the most common type of bearing. They are found in everything from inline skates to hard drives. There are also rolling-element bearings, jewel bearings, fluid bearings, magnetic bearings and other.

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What is an electric current? What types of electric current do you know?

Electric current is a flow of electric charge through a medium. This charge is typically carried by moving electrons in a conductor such as wire. It can also be carried by ions in an electrolyte, or by both ions and electrons in plasma.

The SI unit for measuring the rate of flow of electric charge is the ampere, which is charge flowing through some surface at the rate of one coulomb per second. Electric current is measured using an ammeter. There are two types of electric current - direct current and alternating current.

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What do you know about wind energy?

Wind energy is the kinetic energy of the air in motion. A wind turbine is a device that converts kinetic energy from the wind into mechanical energy . If the mechanical energy is used to produce electricity, the device may be called a wind generator or wind charger. If the mechanical energy is used to drive machinery, such as for grinding grain or pumping water, the device is called a windmill or wind pump. Developed for over a millennium, today's wind turbines are manufactured in a range of vertical and horizontal axis types. The smallest turbines are used for applications such as battery charging or auxiliary power on sailing boats; while large grid-connected arrays of turbines are becoming an increasingly large source of commercial electric power.

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What is junk food?

Junk food is an informal term applied to some foods that are perceived to have little or no nutritional value. Products with nutritional value also have unhealthy ingredients when regularly eaten or to those considered unhealthy to consume at all. Junk foods are typically ready-to-eat convenience foods containing high levels of saturated fats, salt, or sugar, and little or no fruit, vegetables, or dietary fiber. Junk foods are considered to have little or no health benefits. Common junk foods include salted snack foods like chips, candy, gum, most sweet desserts, fried fast food and carbonated beverages, alcoholic beverages.

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What is energy? What types of energy do you know?

Energy is the scalar physical quantity that is a single measure the various forms of motion and transition measure the motion of matter from one form to another. Mechanics distinguishes between potential energy and kinetic energy. Potential energy is energy of interaction of bodies or their parts to each other or with external field. Kinetic is energy of motion. Their sum is called the total energy.

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