# Physics BLOG for K12, High School-discussions and problem solving

###### Physics Fundamentals – #k12 #physics #GRE #NEET #CBSE #ICSE #ISC

This Physics BLOG is founded with the aim to assist students in mastering the basics or the fundamentals by publishing quality contents.The posts published here have been successful so far to clarify many confusions in young minds.

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#### Elevator physics with pseudo force – now it’s easier

Elevator physics with pseudo force When an elevator is moving with an acceleration, it becomes a non-nertial frame of reference. We find it difficult to apply Newton's laws of motion for a non-nertial frame of reference, when the observer is a part of that reference. Here we will discuss the contribution of the concepts of pseudo force and discuss elevator ...

#### mechanics for high school students: a few posts

Here are a few post links on fundamental mechanics which we have posted in last few weeks. Friction Definition                   Newton's Second law Newton's laws and a few application case studies pseudo force Numerical problems for class 9 / Physics problems class 9 Physics problems on Pseudo Force - inclined plane Elevator physics ...

#### Friction definition

Friction definition Friction / Friction definition: If we either slide or attempt to slide a body over the surface of another body, electromagnetic forces act between the charged particles at the surfaces of the bodies which makes each body to exert a contact force on the other. The magnitudes of the contact forces acting on the 2 bodies are equal ...

#### Newton’s second law and equation of Force

Newton’s second law Newton’s second law states that the rate of change of momentum of a body is equal to the net force applied on it. So it’s evident that the second law of Newton was stated in terms of momentum.Mathematically it can be stated this way: Fnet = (mV-mU)/t. Here, U is the initial velocity of the mass m ...

#### Physics problems with pseudo force and solutions

Physics problems with pseudo force with solutions Physics problems with pseudo force with solutions- so you well understand that these problems are going to related with non inertial frame of reference.Let's solve these interesting numericals. A smooth inclined plane of angle of inclination 30 o is moving with a constant acceleration a as shown in the figure. When a block ...

#### Physics problems for class 9 – numericals with solutions

Physics problems for class 9 (CBSE)–numericals set1 This set of Physics problems for class 9 students of CBSE/ICSE/HS boards cover Newton's Laws of motion, Force, linear motion equations and Gravitation. Hope the students will like this set and try to solve the numerical problems themselves. I am providing the solutions as well, but you should try first yourself. the difficulty ...

#### Newton’s laws and Contact Forces between blocks – your must read

Newton's laws & contact Forces between blocks in Mechanics Newton's laws of motion gives us concepts of force (first law), measurement of force with its equation (second law), and reaction of force (3rd law). Today we will discuss an interesting topic of mechanics. It will cover a few interesting applications of Newton's Laws and analyse different force distribution on blocks ...

#### Pseudo force in Physics-did you know this?

Pseudo force - Is it a real force?  Some forces are real, whereas others are not. Real forces have some physical origin, such as a gravitational pull, frictional force or tension of string. In contrast, fictitious force or pseudo force arises simply because the observer is in an accelerating or non-inertial frame of reference, such as one that rotates (like ...

#### Viscosity – definition, derivation, coefficient of viscosity

Viscosity - coefficient of viscosity  When we pour a glass of water, it flows freely and quickly. But when we pour honey that flows slowly and sticks to the container. The cause behind this difference is fluid friction, both within the fluid itself and between the fluid and its surroundings (say container wall). We call this property of fluids as ...

#### Buoyancy – Definition, Buoyant Force, equation and Archimedes

Buoyancy We have certainly experienced Buoyancy knowingly or unknowingly. In this topic we will discuss it with examples and get its definition and related equations. We also discuss the contribution of Archimedes in this regard. When we try to place a mug in a bucket of water we feel one opposing force coming upwards from water as we push the mug ...

#### Torque in physics – definition & formula derivation

Torque in physics - definition Definition of Torque: Torque in physics is also known as the Moment of force. In other words, It is the Rotational analogue of force. As force causes translational motion, the Torque is the cause of rotational motion. If the net torque is zero then a body will not change its rotational state of motion. So first, we ...

#### Equilibrium of a rigid body-conditions and physics

Equilibrium of a Rigid body A rigid body is said to be in mechanical equilibrium, if both its linear momentum and angular momentum are not changing with time. In other words, the body is in mechanical equilibrium when it has neither linear acceleration nor angular acceleration.This means the conditions for equilibrium can be expressed as the following: conditions for equilibrium ...

#### Poisson’s ratio, Strain energy & Thermal Stress – expressions

Poisson's ratio, Strain energy, Thermal Stress This post is the 3rd post of the Elasticity series. Already in our last 2 posts we have discussed the meaning of Elasticity and related concepts like Stress, Strain, Hooke's Law and modulus of elasticity.Today we will briefly discuss couple of very important terms and concepts of the same stream. Those are Poisson's ratio, ...

#### Hooke’s Law – stress and strain – Modulus of Elasticity

Hooke's Law - Modulus of Elasticity - stress and strain In our last post we have discussed on Elasticity and Plasticity. Here we will continue with that discussion and gradually cover the Hooke's Law and Modulus of Elasticity. On the way we will learn two more terms: stress and strain. Finally we will cover (a) Young’s Modulus (2) Shear Modulus (3) Bulk modulus. So ...

#### Elasticity definition & what is more elastic-iron or rubber

Elasticity What is elasticity? As we hear the word ‘elastic’, an image of a rubber band or a very fit & flexible dancer comes into our mind. Many people are stuck with the idea that rubber band is one of the most elastic stuffs around us. Is this true or just a myth? Here we will first try to discuss ...