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Lesson Posted on 28/07/2020 CBSE/Class 11/Science/Physics/Unit 3-Laws of Motion

Basic understanding of Mechanics

Abhijit Gupta

I am an Engineer and a well versed tutor, I am persuing Mtech from NIT TRICHY, I have qualified GATE...

Mechanics ( Basics ) Here in this lesson, I would like to give you the basic introduction of Mechanics. We know that every effect is generated by a cause, Same is here in Mechanics, Suppose a body is in motion, so here the effect for the body is its motion which can only be generated by some kind of... read more

Mechanics ( Basics )

Here in this lesson, I would like to give you the basic introduction of Mechanics.

We know that every effect is generated by a cause, Same is here in Mechanics, Suppose a body is in motion, so here the effect for the body is its motion which can only be generated by some kind of force or maybe by some kind of torque, which we can say the cause of the effect.

 

                                          

 

One should also remember that for a body in motion or in rest you can only see the effect(whether in motion or in rest) but You can never see its cause of motion ( like you can not see the force or torque acting on a body).                                                                                                                        

                                      . 

 

So in Mechanics, you have to find the values which you can not see with the help of values which you can see, like with the help of Motion you can find out the Force or Torque, This thing is very important and one should learn this very well.

 

                                           MOTIONS OF A RIGID BODY

We know that motion of a rigid body is defined as Statics(rest) and Dynamics(motion)

   STATICS: If the net effect of Forces or Moments on a rigid body is zero this is known as Statics part of the motion.                                   

                                         

    The knowledge of Statics is very important in the study of Beams, Columns, Structures, Trusses, Frames, Bridges. So please pay huge attention to understand this topic properly, it will further help you in your higher studies.

                         

 

    In STATICS we study about the equilibrium of Forces and Moments acting upon a rigid body on the basis of which you will study about Trusses and about the Principle of Virtual Work.

 

  DYNAMICS: if a rigid body is in motion due to the net effect of Forces and Motions than we define it as the dynamics part of the motion

    DYNAMICS is further classified into two parts

  • Kinematics- Study of motion Without knowing its Cause(Forces or Torques).
  • Kinetics- Study of motion With its cause (Forces or Torques). 

Kinematics always come before studying Kinetics, actually, there is a cause for this 

I have earlier told you that in Mechanics You have to study motion for calculating the Forces and Torques. The same thing happens here. If you want to study Kinetics you have to first go through Kinematics

        Position Vector -------> Velocity Vector ------> Acceleration Vector---------> Force or Torqe( with the help of Laws of Motions)     

                

 So this is the procedure of studying Kinetics with the help of Kinematics.                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

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Lesson Posted on 21/07/2020 CBSE/Class 11/Science/Physics

The resisting force- friction

Ravi

I have been working as a physics lecturer for 9 years.. I can deal +1,+2 ipe and upto JEE MAINS,NEET....

https://youtu.be/XSnXG49QXO4
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Answered on 27/06/2020 CBSE/Class 11/Science/Physics

Ronak Garg

IIT grad Tutor who can teach all subjects

Change in position vector is displacement.
Answers 131 Comments 1
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Lesson Posted on 23/06/2020 CBSE/Class 11/Science/Physics

Physics

Sureel Adams

I can teach every topic very easily and make it stronger for the students.

Chapter 1 motion The rate of change of a position concerning specific the frame of reference. It's opposite of rest. Motion is everywhere but there's nothing about an absolute motion or an absolute rest. All motion in the universe is relative to each other it's mean no absolute value of motion. This... read more

Chapter 1 motion 

The rate of change of a position concerning specific the frame of reference. It's opposite of rest. Motion is everywhere but there's nothing about an absolute motion or an absolute rest. All motion in the universe is relative to each other it's mean no absolute value of motion.  This chapter focuses on relative motion only.

To the analysis of motion is requires a frame of reference, which may be fixed or movable best example is earth surface is a fixed frame of reference with respect terrestrial motion. Mathematically frame of text can be described as geometric coordinate systems example earth can represent on spherical coordinate systems with radius nearly 6500 km and similarly sun with 109 times larger space.

Vector is quantity having a certain direction to apply to is called the line of action. It Can be represented as bow method or blod latter's its has special properties such as a sum of the vector can be zero. Vectors must follow the triangular additional or parallelogram law. Multiplication of vector is different from ordinary scalar properties. Note that electric current and work done is scalar quantity due to its doesn't follow vectors new laws. Vector was advanced topic eighteen-century science still use today to the analysis of motion. Displacement, Velocity,  acceleration and force are considered as a vector quantity.

the proper definition of particles is a body having mass applying on the centre of gravity is the only point whereas all effects can be balanced but its dimensions are not considered in the analysis. Example consider your mobile is rest in your hand while you are moving with your surroundings arise questions are mobile is moving with respect surroundings or moving with respect to you. To answer these types questions are difficult without fixing a frame of reference because without a frame of reference we can't tell the difference between motion or rest.

Some motion can be treated as rest but its motion example at atomic level scale electrons are travelling near the speed of light and orbit around the nucleus of an atom that analysis is considered as microscopic levels whereas human senses activity considers as macroscopic levels where activity in atomic scales are highly negligible. The same problem also happens in Cosmo levels for example Consider earth as a particle moving in a circular orbit around the sun in a year. Sun is also moving an orbit to the star named sage A* in 250 million years which is centre of the galaxy. Our galaxy is moving towards a bigger galaxy as per telescopic observation in the night sky as per comparison of scale here activity on earth such as movements of people's and animals can be considered as neglected. Sence of motion requires a frame of reference.

As conclusion "nothing is absolute motion or absolute rest " all motion is relative.

It's all about motion.

Next topic is displacement and distance.

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Answered on 19/06/2020 CBSE/Class 11/Science/Physics

Mrinal Anand

Harvard certified seasoned educator with 12+ years of solid experience in grooming ignited minds !

Yes for pure rotation, the distance between two particles will always remain constant.
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Answered on 27/05/2020 CBSE/Class 11/Science/Physics

Mitesh Prajapati

I have completed my (B.Sc M.Sc Physics)..And Teaching @class 11,12 @Experience.= 5year

In everyday life, we inhabit a space of three dimensions. but Generally, there are 4 dimensions (x,y,z:t) 3 axis and 4th is time. Mathematically there is N dimensions. read more

In everyday life, we inhabit a space of three dimensions. but

Generally, there are 4 dimensions (x,y,z:t) 3 axis and 4th is time.

 

 Mathematically there is N dimensions.

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Answered on 16/06/2020 CBSE/Class 11/Science/Physics

Anusuya Padhi

Physics lecture with 8 years teaching experience

Newton's second law tells about inertia and definition of force. Force is the cause of every motion. While Newton's 2nd law gives the mathematical expression for force, so Newton's 2nd law can be used to state Newton's first law.
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Answered on 27/05/2020 CBSE/Class 11/Science/Physics

Rahul Srivastava

Your choice , your decision i will try only to shape your enthusiasm

Duality
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Answered on 03/06/2020 CBSE/Class 11/Science/Physics

Vijay Kumar

IITJEE Mains and Advanced PHYSICS 8 years experience.

It is a fundamental postulate of Einstein's particular theory of relativity. We found no evidence opposing this until now. It is confirmed later in many experiments.
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Answered on 27/05/2020 CBSE/Class 11/Science/Physics

Mitesh Prajapati

I have completed my (B.Sc M.Sc Physics)..And Teaching @class 11,12 @Experience.= 5year

The person must have high velocity then drift velocity of the electron, which is practically not possible.
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