DIFFERENCE BETWEEN TORQUE AND MOMENT EXPLAINED !!

The terms torque and moment originated with the study conducted by Archimedes on levers. Torque (most commonly used) or moment (used by engineers) is a concept of turning force. This turning force is applied when we push a door or try to open a nut using spanner. Both the door and the spanner turn about a point called the pivot or fulcrum. The force that is applied is at some distance from this fulcrum. The turning effect of the force applied depends upon this distance from the pivot or fulcrum.

Moment = Force* Perpendicular distance from the pivot

From this equation, it is clear that if we want to complete the task using less force, we have to increase the distance from the pivot.

In contrast, when a car driver turns a steering wheel, he exerts two equal and opposite forces on the steering. These forces form a couple and the turning effect of this couple is the sum of the moment of the two forces. The moment of a couple is called Torque.

Torque= Force*Perpendicular distance between the two perpendicular forces

In common parlance, Torque and moment are used interchangeably. Torque, or the moment of a force is its ability to rotate an object about an axis. While force is applied in torque as well, force is a push or a pull but in torque this force is in the form of a twist.

For the students of mechanical engineering, the two terms are different and not interchangeable. In general moment is the term used when referring to the ability of a force to turn an object about its axis. Torque is a special application of moment. When there are two equal and opposite forces, they form a couple, and the moment that results is called a torque. Here the applied force vectors are zero.

Summary:

1.“Moment” is a concept of engineering and physics that refers to the tendency of a force to move an object while torque is the tendency of a force to rotate an object in a pivot.
2.Moment is the perpendicular distance between the point of rotation and the force’s line of action while torque is a measure of the turning force of an object.
3.Torque is used to measure coupling while moment is not.
4.Both torque and moment have the Newton meter as the SI unit; torque is presented as Nm/revolution while moment is presented as Nm.
5.Moment is a static force while torque is a movement force.
6.Moment is used when there is no rotation while torque is used when there is rotation and a pivot.
7.Moment has the symbol “M” while torque has the Greek letter “tau” as its symbol.

STEEL WHEELS ARE USED IN TRUCKS AND BUSES RATHER THAN ALLOY WHEELS.WHY ???

Steel wheels are commonly used in trucks and buses rather than alloy wheels.Although alloy wheels are light in weight but steel wheels are preferred.

This Video will give you a clear explanation of reason behind this.

DIFFERENCE BETWEEN REFRIGERATION AND AIR CONDITIONING EXPLAINED !!

Air conditioners and refrigerators are devices used to keep a space at a colder temperature than its surroundings. The main difference between refrigeration and air conditioning is that refrigeration, in general, refers to any process where thermal energy is taken away from a place and transferred to a place with a higher temperature. Air conditioning is a type of refrigeration where thermal energy is taken away from the air (typically in a room or a vehicle) in order to keep the air cooler. 

What is Refrigeration:

Refrigeration refers to processes that take thermal energy away from a place and gives off that energy to a place with a higher temperature. Naturally, thermal energy flows from a place with a higher temperature to a place with a lower temperature. Therefore, refrigeration runs against the natural heat flow and so it requires work to be done. Refrigerator is a name that we use for devices that are used to keep food at low temperatures. 

What is Air Conditioning:

Air conditioning is a type of refrigeration where thermal energy is taken away from the air in a large space such as a room or a vehicle. Air conditioners are fitted into rooms so that they cool the air inside them. Air conditioners also reduce humidity in rooms, because the water vapour in the room can condense around the colder parts of the air conditioner. The condensed water can be then drained off.

Difference Between Refrigeration and Air Conditioning:

Process

>Refrigeration is a process where thermal energy is transferred from a place with lower temperature to a place with  higher temperature using energy, against he natural flow of heat.

>Air conditioning is a type of refrigeration which is used to cool large volumes inhabited by people.

Functions

>Refrigeration is concerned only with regulating the temperature of a volume of air.

>Air conditioning is concerned with not only maintaining the temperature of a volume of air, but also maintaining he humidity and purity.