Mechanics Questions

The branch of Physics that studies motion when a body/object is subjected to forces or displacements and the subsequent effects of the bodies on their environment is known as Mechanics. It also deals with relationships among matter, motion, and force. This is the basic concept that leads to the study of gravitation, electricity, and magnetism.

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Mechanics are classified into:

• Classical mechanics
• Quantum mechanics
• Statistical mechanics

Classical Mechanics

This branch of mechanics deals with how an object moves under the action of forces. It also helps us understand what happens to a thing at rest when forces act. Classical Mechanics deals with the study of macroscopic objects. It is classified into:

• Kinematics
• Statics
• Dynamics

Kinematics is the branch of mechanics. It deals with the motion a body or system of bodies can undergo without considering the forces involved. It is used to analyse the spatial position of bodies, the rate at which the particles move, and the rate at which their velocity changes.

Statics is the branch that deals with forces acting on a body that is at rest.

Dynamics is the branch that studies the effect of forces and torques on the motion of bodies having mass.

Quantum Mechanics

Quantum mechanics deals with the behaviour of matter and light on the atomic and subatomic scale. It studies the properties of molecules and atoms along with their constituents. It involves the study of microscopic objects.

Statistical Mechanics

Statistical mechanics combines the principles of statistics with both classical and quantum Physics. This branch of mechanics deals with the static objects on which the force is applied. Let’s say there is an ‘N’ number of system of particles in thermal equilibrium at absolute temperature T, the energy E is associated with each particle. The energy for ‘N’ particles will be:

N (E) = g (E) f (E)

Where,

N (E) = total energy of all the particles in a system.

g (E) = Number of state of energy (E) or the statistical weight regarding the energy

f (E) the distribution function

It helps in analysing the macroscopic parameters like temperature and pressure.

Important Mechanics Questions with Answers

1. Fluid mechanics is a part of which branch of mechanics.

Fluid mechanics is a part of classical mechanics.

2. What is mechanics?

Mechanics is a branch of physics that deals with the bodies under motion due to forces or bodies at rest.

3. How is mechanics classified?

Mechanics is classified into:

• Classical mechanics
• Quantum mechanics
• Statistical mechanics

4. State true or false: Classical Mechanics deals with the study of microscopic objects.

1. TRUE
2. FALSE

Answer: b) FALSE

Explanation: Classical mechanics deals with the study of macroscopic objects.

5. The part of mechanics that defines motion without concerning its causes is called _____

1. Statics
2. Dynamics
3. Kinematics
4. None of the options

Answer: c) Kinematics.

Explanation: Kinematics is the branch of mechanics that deals with the object’s motion without considering the cause of the motion.

6. Fill in the blanks _____ is used to define movements of the wavefunction of a single particle.

1. Nuclear physics
2. Matrix mechanics
3. Continuum mechanics
4. Schrödinger wave mechanics

Answer: d) Schrödinger wave mechanics

7. Which is not the parameter of motion?

1. Velocity
2. Atomic structure
3. Time
4. Speed

Answer: b) Atomic structure

Explanation: Atomic structure is not part of the motion.

8. The branch of statistical mechanics which treats and extends classical thermodynamics is known as _____

1. Statistical Equilibrium
2. Statistical Thermodynamics
3. Statistical temperature
4. Option (a) and (b)

Answer: d) Option (a) and (b)

9. Which branch deals with heat and the direction of heat flow?

1. Equilibrium
2. Conservation of energy
3. Dynamics
4. Thermodynamics

Answer: d) Thermodynamics

10. Which are the fundamental dimensions used in mechanics?

1. Time
2. Mass
3. Length
4. All the above options

Answer: d) All the above options.

Explanation: Time, Mass, and Length are the fundamental dimensions of mechanics.

Practice Questions

1. Define and explain classical mechanics.
2. Define and explain quantum mechanics.
3. Define and explain statistical mechanics.
4. What is the formula to calculate the total energy of all the particles in a system in statistical mechanics?
5. What are the branches of classical mechanics?