Movement of the vehicles


Motion and engine are the two vital concepts in physics. Most of the topics are linked with these two mechanisms that are motion and engine. Anything we see surrounding us is either in motion and something related to heat. We can see a train moving. It is the combination of motion and engine. The engine produces the heat which makes the train move. An engine basically functions when heat is generated. The heat generated ignites the engine and hence the movement of the object takes place. Heat, motion go hand in hand for the process and mechanism.


We all know about motion. In simpler words, the motion can be recognised as the movement of the object from one point to another. The movement can be in two or more dimensions. A motion called relative motion is present which has one or more dimensions.

The concept of reference frames was first introduced to talk about relative motion in one or more dimensions. When we predict that an object has a certain velocity, then this velocity is with respect to some frame which is known as the reference frame. In day to day life, when we measure the velocity of an object, the reference frame is considered to be the ground or the earth.

For instance, if one person is travelling in a train and the train is moving at a speed of 100 km/hr, then the person’s speed according to another passenger sitting on that train is zero. According to him, the person is not moving. But if someone observes the person outside the train, standing on the ground, according to him, the person is moving with 100 km/hr as he is on the train and the train is moving with 100 km/hr. Here, the motion observed by the observer depends on the location (frame) of the observer. This type of motion is known as relative motion.


Heat is a form of energy that can be transferred from one body to another easily. Heat Engine is one of the most vital concepts in physics. A system that converts heat into work by taking heat from the reservoir ( hot body) to carry out some work is called a heat engine. There is also a discharge of some heat to the sink (cold body).


There are basically two types of heat engines

  • External combustion engine: In this type of engine the fuel gets burned outside the engine or at a far distance from the engine by which it can produce force and motion. Example for this type of engine is Steam engine
  • Internal combustion engine: In this type of engine the fuels are burned inside the chamber. Example for this type of engine is the Car engine.


  • Engines in thermal power station
  • Steam locomotive
  • Refrigerators
  • Heat pumps
  • Old type trains

Motion and engine are the main concepts through the physics forms its base for other interlinked topics. Main engines, industries, locomotives, factories, thermal power station have a wide variety of applications in this field.