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# Physics

Articles related to class 9, 10, 11, 12 and B.Sc.

## Some helpful Tips for Thermodynamics

Thermodynamics is a scoring chapter in JEE physics. Here are some Some helpful Tips for Thermodynamics to solve the problem correctly and quickly Tip 1. Always make sure you Heat(Q) ,Internal Energy(U) & Work(W) with correct sign in equation ?U=Q-W W is positive when work done by the system(Increase in Volume) W is negative when work …

## How to effectively solve the Momentum and Collisions problems

Things to remember
1) Law of conservation of Momentum. The total momentum for the isolated remains constant
2) Elastic collision: In this collison, Momentum and Kinetic energy of the system remains conserved
3) Inelastic collision: In this collision ,Momentum is conserved only

## How to Solve Newton’s Second Law Problems

Scope of the Problem:

How to attack at the Problem
1) Draw one free body diagram for each object in problem

Read the following two post to get the feel about free body diagram

## Atwood machine

The Atwood machine (or Atwood’s machine) was invented in 1784 by Rev. George Atwood as a laboratory experiment to verify the mechanical laws of motion with constant acceleration. Atwood’s machine is a common classroom demonstration used to illustrate principles of classical mechanics.
The ideal Atwood Machine consists of two objects of mass m1 and m2, connected by an inextensible massless string over an ideal massless pulley.

## Mechanics of Turning a car on the curve

Since the car is turning on a curve, The car will be accelerating as direction of the car changes even the velocity is constant. This acceleration is centripetal acceleration And centripetal force will be providing it,
There are three cases with turning
1) Unbanked curve.
2) Banked curve with no friction
3) Banked curve with friction

## Energy facts

1)The word energy comes from the Greek word energeia.
2)Most types of energy are either a form of kinetic energy or potential energy.
3)Common examples include heat energy, elastic potential energy, chemical energy, sound energy, nuclear energy, geothermal energy , gravitational potential energy and electric Potential energy
4) Kinetic energy refers to the energy an object has because of its movement. A Truck in motion has kinetic energy, as does a basketball when you pass or shoot it.

## Kinematics Good conceptual problems

Question: If you are riding on a train that speeds past other train moving in the same direction on adjacent train.It appears the other train is moving backward. Why?

Solution:
Your reference frame is that of the train you are riding. If you are traveling with a relatively constant velocity (not over

## Use of concept of electric potential

We already know about electric field and electric potential. We also know that electrostatic field is completely characterized by vector function E(r). The electric field depicts the force exerted on other electrically charged objects by the electrically charged particle the field is surrounding. Now a question arises why do we need introduction of electric potential when we already have electric field for the description of electric force between charges.