Newton’s Physics: Linear Time
In or around 1665, when Isaac Newton derived the motion of objects falling under gravity, the first clear formulation for mathematical physics of a treatment of time began: linear time, conceived as a universal clock.
- Absolute, true, and mathematical time, of itself, and from its own nature flows equably without regard to anything external, and by another name is called duration: relative, apparent, and common time, is some sensible and external measure of duration by the means of motion, which is commonly used instead of true time; such as an hour, a day, a month, a year.
The water clock mechanism described by Galileo was engineered to provide laminar flow of the water during the experiments, thus providing a constant flow of water for the durations of the experiments, and embodying what Newton called duration.
In this section, the relationships listed below treat time as a parameter which serves as an index to the behavior of the physical system under consideration. Because Newton’s fluents treat a linear flow of time , time could be considered to be a linearly varying parameter, an abstraction of the march of the hours on the face of a clock. Calendars and ship’s logs could then be mapped to the march of the hours, days, months, years and centuries.
Iii Right Mix Of Books
Picking the right book is a task for many students, but know that NCERT must be your go-to. There are tons of books out there by different publishers, but dont let that tempt you. In the quest of learning more, students tend to refer to multiple sources and hence jumble up information provided in different books for the same topic which may have repercussions.
Once you have mastered NCERT, you can refer to previous years question papers collated altogether in a single book, available in the markets. Additionally, you may refer to different modules available online and solve questions. Apart from this, go through these reference books for Physics:
- Concepts of physics HC Verma
- Objective NEET Physics DC Pandey
You may also be interested in:NEET Preparation Tips
How To Solve Any Physics Problem
wikiHow is a wiki, similar to Wikipedia, which means that many of our articles are co-written by multiple authors. To create this article, 23 people, some anonymous, worked to edit and improve it over time. This article has been viewed 282,807 times.
Baffled as to where to begin with a physics problem? There is a very simply and logical flow process to solving any physics problem.
Don’t Miss: What Is Uneven Development In Geography
V Smart Work Over Hard Work
Once you have mastered the NCERT syllabus, move to solve previous years questions, different modules. After reading a chapter, cover all the MCQs appearing in previous years papers and sample papers.
Do not memorize formulae, rather go back to its derivation and understand it. This will help you solve problems easily and help with better comprehending questions.
Apart from reading NCERT for numericals, it can also be referred to for its theory. Additionally, focus on the units of numericals, as accuracy here matters.
Also Check: NEET Physics MCQs
The Unit Of Measurement Of Time: The Second
In the International System of Units , the unit of time is the second . It is a SI base unit, and has been defined since 1967 as “the duration of 9,192,631,770 of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom”. This definition is based on the operation of a caesium atomic clock.These clocks became practical for use as primary reference standards after about 1955, and have been in use ever since.
Recommended Reading: What Are The Different Kinds Of Reasoning In Geometry
How Can I Find Time In Physics With A Motion Problem
My problem is:
A car slows down at $-5.00~\text/\text^2$ until it comes to a stop after travelling $15.0~\text$. How much time did it take to stop?
So this is how my school taught me to solve this:\begint & = ?\\a & = -5.00~\text/~\text^2\\v_f & = 0\\\delta x & = 15.0\end
$$\delta x = v_f t – \fracat^2$$
I have tried to find time using distance over speed, but that answer is incorrect. Is there a way to solve this problem using the formula my school gave me , or is there another way? Thanks!
- $\begingroup$Welcome to MathSE. Please read this MathJax tutorial, which explains how to typeset mathematics on this site.$\endgroup$;N. F. TaussigAug 14 ’18 at 12:40
- $\begingroup$You can think of it another way: A car at rest starts accelerating at $5~\text/\text^2$. What is its speed after $15$ metres?$\endgroup$
The equation $$\delta x = v_f t – \fracat^2$$is a quadratic equation in $t$, which can be expressed in the form$$\fracat^2 – v_f t + \delta x = 0$$so it could be solved by using the Quadratic Formula.
However, in this case, we know that $v_f = 0$. Hence,$$\delta x = -\fracat^2$$Solving for $t$ yields\begin-2\delta x & = at^2\\-\frac & = t^2\\\sqrt} & = |t|\\\sqrt} & = t && \text\endYou can now substitute $15.0~\text$ for $\delta x$ and $-5.00~\dfrac}^2}$ for $a$ to solve for $t$.
How To Score 170+ In Physics Neet 2021
With exams being just around the corner, students are leaving no stone unturned to make the most of the time and give their best to get that perfect score. If one desires to enter a good college, securing 600+ marks is imperative and this can be achieved if one scores above 170+ in the Physics section of NEET;exams.
Often considered as the most challenging section, NEET Physics draws flak, becoming troublesome for most students. The fear is due to lack of preparation or not being fast enough to solve questions, as technically, within seconds, students are expected to understand the question, recall the right formula, some calculations and arrive at the right answer this is time-consuming. But there are no shortcuts to this except that one has to practice and improve speed and accuracy.
See also:Important notes for NEET
With a staggering 16 lakh students all set to appear for exams, what would provide a student with an edge over others is the application of theoretical knowledge to questions while maintaining accuracy and speed. NEET is carried out in the offline mode by the NTA across India. It enables students to seek admissions to medical courses after appearing in the class 12 exams.
Also Check: How Do Noise Cancelling Headphones Work Physics
What Equations Can You Use
What equations include the quantities you know and also the one youre looking for? If you have the mass of an object and a force and youre trying to find the acceleration, start with F=ma . If youre trying to find the electric field but you have the charge and the distance, try E=q/.;
If youre having trouble figuring out which equation to use, go back to our first trick. What equations are associated with the topic? Can you manipulate the quantities you have to fit in any of them?;
Bonus Trick: hack the units
This trick doesnt always work but it can jumpstart your brain. First, determine the units of the quantity youre trying to find and the quantities you have. Only use base units , not compound units . Multiply and divide the quantities until the units match the units of the answer quantity. For example, if youre trying to find Potential Energy and you have the height , mass , and gravitational acceleration , you can match the units by multiplying the three quantities .
Note: Unlike the other ones, this trick wont always work. Watch out for unitless constants. For example, Kinetic energy is ½*mass*velocity2, not just mass*velocity2 as the units suggest. Even though this trick isnt perfect, however, it can still be a great place to start.
How To Calculate Tension In Physics
This article was co-authored by Bess Ruff, MA. Bess Ruff is a Geography PhD student at Florida State University. She received her MA in Environmental Science and Management from the University of California, Santa Barbara in 2016. She has conducted survey work for marine spatial planning projects in the Caribbean and provided research support as a graduate fellow for the Sustainable Fisheries Group.There are 7 references cited in this article, which can be found at the bottom of the page.wikiHow marks an article as reader-approved once it receives enough positive feedback. This article has 15 testimonials from our readers, earning it our reader-approved status. This article has been viewed 1,633,307 times.
In physics, tension is the force exerted by a rope, string, cable, or similar object on one or more objects. Anything pulled, hung, supported, or swung from a rope, string, cable, etc. is subject to the force of tension.XResearch source Like all forces, tension can accelerate objects or cause them to deform. Being able to calculate tension is an important skill not just for physics students but also for engineers and architects, who, to build safe buildings, must know whether the tension on a given rope or cable can withstand the strain caused by the weight of the object before yielding and breaking. See Step 1 to learn how to calculate tension in several physical systems.
Recommended Reading: Geometry Wars 2 Smile Achievement
Time Velocity And Speed
- Explain the relationships between instantaneous velocity, average velocity, instantaneous speed, average speed, displacement, and time.
- Calculate velocity and speed given initial position, initial time, final position, and final time.
- Derive a graph of velocity vs. time given a graph of position vs. time.
- Interpret a graph of velocity vs. time.
Figure 1. The motion of these racing snails can be described by their speeds and their velocities.
There is more to motion than distance and displacement. Questions such as, How long does a foot race take? and What was the runners speed? cannot be answered without an understanding of other concepts. In this section we add definitions of time, velocity, and speed to expand our description of motion.
The 4 Step Guide To Solving Neet Numericals
NEET or National eligibility cum Entrance Test is an annually conducted medical entrance exam, enabling medicine enthusiasts to take up undergraduate medical courses. The conducting body for the exam is National Testing Agency . NEET, since 2016 has replaced AIPMT and in recent times has also replaced the multiple state level entrance exams and has emerged as a national, single-level entrance test.
For the uninitiated, most of the candidates taking up NEET UG exams are keen on pursuing medicine with a strong foothold in Biology as a subject and medicine as a profession. Such candidates are not necessarily great at Physics and Chemistry. These can turn out to be quite daunting subjects for those who have been running away from these subjects. But, if you have been analyzing concepts from these subjects closely, you would have observed that these subjects are actually very interesting and gripping.
Some stats as per a poll, nearly 50% of the candidates appearing for NEET exams have taken up PCB as subject majors in their +2 classes. This comes as part of realization that perhaps opting for mathematics may not be a very good option for them due to its complexities. Fairly so, as Physics and mathematics go hand in hand. Physics and Chemistry are subjects involving mathematical concepts and cracking NEET with a good rank becomes unlikely if you do not have a good grip over these subjects.
Also see:Important notes for NEET
Don’t Miss: How To Do Elimination In Math
Get Answers On Time To Submit Assignments On Time
You cannot remain dependent upon your school science teacher to look after your specific problems in Physics as he has to complete the syllabus in a short time period. He therefore explains the chapters in Physics at his usual pace and expects that all students will grasp the concept. If you are not attentive or fail to understand a concept, you will need help from an expert to make the concept clear for you. This is necessary as otherwise you cannot solve problems based upon that principle. Websites solving the problems of students claim to have cracked thousands of text books to provide quick and efficient physics homework answers in a quick time. You can post a question on the website at any time of the day and also expect it to be answered by the expert teachers in as little as 2 hours time.
You can get this online help sitting in the comfort of your own home any time of the day. This is really great as you can get answers to questions given by your teacher at school as homework. This is only the start as you find that explanations given by teacher on these websites slowly and gradually start to make the concepts clear to you. This is really helpful as it goes a long way in mastering physics homework solutions on your own. Yes, as time passes and you receive continuous help from online teacher, you become proficient in Physics and become able to solve the problems on your own.
Vi Practice And Repeat
Physics demands rigorous practice. Regular practice will help you decode recurring topics, the pattern of the questions, the art of how questions are tweaked around topics, above all, it enhances your levels of speed and accuracy which are the most important metrics in competitive exams such as NEET.
Practising questions also help students to understand the difficulty level of questions, hence giving them confidence which only gets them surplus time at the exam hence propels confidence level. Always remember to solve mock tests under ideal exam scenarios. Every time you take up this test, take it up with the same intention which you would have while giving the actual NEET exam.
Recommended Reading: When Was Geometry Dash Made
Time With Respect To Velocity
The general gravity equation for elapsed time with respect to velocity is:
t = /g
Since the initial velocity vi = 0 for an object that is simply falling, the equation reduces to:
t = v/g
- t is the time in seconds
- v is the vertical velocity in meters/second or feet/second
- g is the acceleration due to gravity
Since the object is moving in the direction of gravity, v is a positive number.
Elapsed time of a falling object as a function of velocity or displacement
What Are The Key Components Of Projectile Motion
The key components that we need to remember in order to solve projectile motion problems are:
- Initial launch angle, \theta
- Initial velocity, \text
- Time of flight, \text
- Acceleration, \text
- Horizontal velocity, \text_\text
- Vertical velocity, \text_\text
- Displacement, \text
- Maximum height, \text
- Range, \text
How To Solve Any Projectile Motion Problem : Introducing the âToolboxâ method of solving projectile motion problems! Here we use kinematic equations and modify with initial conditions to generate a âtoolboxâ of equations with which to solve a classic three-part projectile motion problem.
Now, letâs look at two examples of problems involving projectile motion.
Don’t Miss: What Is Psychometrics In Psychology
Online Help With Your Problems Is A Very Effective Method
Internet has emerged as information super highway for people around the world. Availability of fast speed internet in homes across the country has helped students greatly as they can now receive physics homework help sitting in the comfort of their own home rather than having to go to a coaching center or call in a tutor at home. Both these options are costly proposition in present times. In contrast, registering yourself with any of the many websites providing online help to students proves to be not only inexpensive but also very convenient way of receiving help in completing your physics homework.
What Is The Subject
Just about every physics question is testing specific knowledge. When you read the question ask yourself, is it exploring electricity? Torque? Parabolic motion? Each topic is associated with specific equations and approaches, so recognizing the subject will focus your effort in the right direction. Look for keywords and phrases that reveal the topic.;
Read Also: Eoc Fsa Warm Ups Algebra 1 Answers
How To Use Time Formula
Time formula can be used to find the time taken by;an;object, given the distance and unit speed. Let’s take a quick look at an example showing how to use the formula for time.
Example:;What will be the total time;to cover;3600 m at 2 meter per seconds?
Solution:;Using Formula for time,
Time = Distance ÷ SpeedTime = 3600 ÷ ;= 1800 seconds.
Answer: Total time taken to cover the distance of 3600 m is 1800 seconds.
Foolproof Plan To Score 170+ In Neet 2021 Physics
In order to score above 170 marks in the Physics section, one has to get at least 43 out of 45 questions correct. It is certainly possible with practice and sheer dedication. Here, with this article, we bring to you a list of steps which you must include if you wish to score above 170+ in the Physics section.
You May Like: What Does Mole Mean In Chemistry
Tricks For Solving Any Physics Problem
Physics can be intimidatingall those pulleys and protons and projectile motion. If you approach it with the right mindset, however, even the hardest problems are usually easier than you think. When you come up against a tough question, dont panic. Instead, start with these short, easy tricks to help you work through the problem.;
Solving Equation Of Motion With No Time Element
In my assigned reading I was given this explanation of how to solve a motion equation without a time element. Here’s the passage where he explains it:
This is my attempt. Sorry for the chicken scratch, but this is like my umpteenth time trying it. I’m able to get and 1/2 over but that rogue initial velocity is messing me up. I tried distributing it into the solved for t equation but that just gave me a mess. I feel like it’s something simple I’m missing.
Also Check: What Are The Major Specialties In Psychology