Top 41 Machine Dynamics Interview Questions You Must Prepare 08.Jun.2023

The lighter objects is moving faster than heavier.

It is an effort which sets the objects in motion.

It is defined as its capacity to do work.

The frictional force between two surfaces when one roles over the other is called rolling friction. A wheel or a ball is slightly flattened when its rests over a surface. A surface also is slightly dented. Because of this deformation a resistance force arises when the wheel or ball rolls on a surface. This is called rolling friction. Rolling friction is much smaller than sliding friction.

It is region where at every point, the magnitutde and the direction of the force is known.

For example: the gravitational force due to the earth acting on a mass of 1kg can be specified at all the points on the surface of earth both in magnitude and direction. We then say that there is a gravitational “ force field ”

Displacement is the vector that specifies the change in position of a point or a particle in reference to a previous position. When the previous point is the origin, this is better referred to as a position.

It confirms the law of conversion of energy.

With the help of these forces we can explain he observations made on atoms and nucleons. These observations can be explained on two types of forces called strong and weak forces. Strong force acts between protons and neutrons in a nucleus. It acts only over a very short range of about 10 -15 m. A weak force acts between any two elementary particles like electron and neutron.

When a solid body is moved over the surface of another solid body, an opposing force acts in between the two surface ( parallel to them ) and it tends to destroy the relative motion in between them. This opposing force is called force of friction. The magnitude of the force of friction depends upon the nature of the two surfaces in contact.

It is defined as the external agency that changes or tends to change the state of rest or uniform motion of a body in a straight line.

Because there is no friction in empty space.

A change in its internal kinetic energy, potential energy.

Rolling of a wheel on surface is possible because of the friction between the two. Due to this reason the types have treads which increase friction and avoid slipping.

The property of a material body by virtue of which the body at rest tends to remain at rest and an object in motion tends to remain in motion is called interia.

Bodies have two kinds of intertia :

  1.  Interia at rest
  2.  Intertia of motion 

  1.  Gravitational force
  2.  Electrostatic force
  3.  Magnetic force
  4.  Atomic force
  5.  Nuclear force

A quantitative measure of the property of interia of an object is its mass. Greater the mass of the body, larger is the effort needed to set it in motion. Also greater the mass of a body, the larger is the effort needed to stop it if it is in motion already.

There are two types of charges; positive and negative. The electrostatic force between two opposite charges is attractive while between two similar charges it is repulsive. This force is effective over large distances.

They are different physical structures of a solid substance,

Example: diamond and graphite both are, allotropes of carbon.

When two or more bodies interact with one another, their total momentum remains constant, provided no external forces are acting.

Heat, Light, Sound, Magnetic, Electric, Kinetic, Potential etc,, are the main forms of energy.

There is a gravitational force of attraction between any two objects. All objects fall towards the earth because of gravitational force of earth, F= mg, where m is mass of the body. The direction of this force is towards the centre of the earth. This force is effective over large distances.

When a body rotates about a fixed axis the motion is said to be rotatory.

The study of motion, which describes a relation between force and its effect, is called dynamics.

It is the method used to study the structure of crystals.

The force between two magnets is called magnetic force. The electric and magnetic forces are two facts of the general electromagnetic force facts.