# Classical Mechanics [IFS (Forests Services) Physics (Mains)]: Questions 1 - 5 of 7

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## Question number: 1

» Classical Mechanics » Particle Dynamics » Conservation of Linear and Angular Momentum

Appeared in Year: 2011

### Write in Short

A particle of rest mass ‘M’ moving at a velocity ‘u’ collides with a stationary particle of rest mass ‘m’. If the particle stick together, show that the speed of the composite ball is equal to,

Where (Paper-1) (Section –A)

## Question number: 2

» Classical Mechanics » System of Particles » Generalised Coordinates and Momenta

Appeared in Year: 2012

### Describe in Detail

Using D’ Alembert’s principle, show that the following relation can be obtained for a system of particles under generalized coordinates,

What is the significance of ? (Paper-1) (section – A)

### Explanation

- The mathematical statement of D’ Alembert’s principle is given as,

- Transform D’ Alembert’s principle into expressions containing independent generalized coordinates only.

- Equation (2), gives an infinitesimal virtual displacement at particular instant . W

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## Question number: 3

» Classical Mechanics » System of Particles » Cyclic Coordinates

Appeared in Year: 2012

### Write in Short

Express Lagrange’s equation of motion for the cyclic coordinate and show that the result leads to the general conservation theorem for the generalized momentum coordinates. (Paper - 1) (Section – A)

## Question number: 4

» Classical Mechanics » System of Particles » Generalised Coordinates and Momenta

Appeared in Year: 2012

### Describe in Detail

Starting with Newton’s second law of motion, establish D’ Alembert’s principle and discuss its significance? (Paper-1) (Section –A)

### Explanation

Let consider a system described by generalized coordinates . And this system undergoes a certain displacement in configuration space. If for this displacement it does not take any time and it is consistent with the constraints on the system. This kind of displacement is called virtual.

In virtual displacement there

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## Question number: 5

» Classical Mechanics » Particle Dynamics » Rotating Frames

Appeared in Year: 2013

### Write in Short

A satellite revolves in a circular orbit around the Earth at a certain height above it. Calculate the time period of revolution of the satellite, if the radius of the Earth is significantly higher than the height at which the satellite revolves. (Section A)