NEET  >  Additional Documents & Tests for NEET  >  Theory & Procedure, Helical Spring

Theory & Procedure, Helical Spring Notes | Study Additional Documents & Tests for NEET - NEET

Document Description: Theory & Procedure, Helical Spring for NEET 2022 is part of Additional Documents & Tests for NEET preparation. The notes and questions for Theory & Procedure, Helical Spring have been prepared according to the NEET exam syllabus. Information about Theory & Procedure, Helical Spring covers topics like and Theory & Procedure, Helical Spring Example, for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Theory & Procedure, Helical Spring.

Introduction of Theory & Procedure, Helical Spring in English is available as part of our Additional Documents & Tests for NEET for NEET & Theory & Procedure, Helical Spring in Hindi for Additional Documents & Tests for NEET course. Download more important topics related with notes, lectures and mock test series for NEET Exam by signing up for free. NEET: Theory & Procedure, Helical Spring Notes | Study Additional Documents & Tests for NEET - NEET
1 Crore+ students have signed up on EduRev. Have you?

Objective

To find the force constant of a helical spring by plotting a graph between load and extension.

Theory

What is a helical spring?

The helical spring, is the most commonly used mechanical spring in which a wire is wrapped in a coil that resembles a screw thread. It can be designed to carry, pull, or push loads. Twisted helical (torsion) springs are used in engine starters and hinges. 

Let’s study how we can use the helical spring to do our experiment.

The helical spring is suspended vertically from a rigid support. The pointer is attached horizontally to the free end of

Theory & Procedure, Helical Spring Notes | Study Additional Documents & Tests for NEET - NEET

spring. A metre scale is kept vertically in such a way that the tip of the pointer is over the divisions of the scale; but does not touch the scale. 

Helical spring works on the principle of Hooke’s Law. Hooke’s Law states that within the limit of elasticity, stress applied is directly proportional to the strain produced.

Theory & Procedure, Helical Spring Notes | Study Additional Documents & Tests for NEET - NEET

When a load ‘F’ is attached to the free end of a spring, then the spring elongates through a distance ‘l’ .Here ‘l’ is known as the extension produced. According to Hooke’s Law, extension is directly proportional to the load.

This can be represented as:

Theory & Procedure, Helical Spring Notes | Study Additional Documents & Tests for NEET - NEET

where ‘k’ is constant of proportionality.  It is called the force constant or the spring constant of the spring.

A graph is drawn with load M in kg wt along X axis and extension, l in metre along the Y axis. The graph is a straight line whose slope will give the value of spring constant, k .

Learning Outcomes:

  • Students understand the principle of  Hooke’s Law.
  • They learn about the force constant of a spring.
  • Students understand the relationship between force applied and extension produced in a spring.

Materials required

  • A spring
  • A rigid support
  • Weight hanger
  • 50g or 20 g slotted weights
  • A vertical wooden scale
  • A fine pointer

Real Lab Procedure

  • The helical spring is suspended vertically from a rigid support.A pointer is attached horizontally at the free end of the spring.
  • A metre scale is kept vertically in such a way that the tip of the pointer is over the divisions of the scale, but does not touch the scale.
  • A dead weight, w0 gwt is suspended by the weight hanger to keep the spring vertical. The reading of the pointer on the metre scale is noted.
  • Now, gently add a suitable load of 50 g slotted weights to the hanger and the reading of the pointer is noted.
  • The weights are added one by one till the maximum load is reached. In each case, the reading of the pointer is noted.
  • The weights are then removed one by one and the reading of the pointer is noted in each case of unloading.
  • The average of the readings for each load during loading and unloading is calculated in each case.    Let z0, z1, z2, z3…etc.., be the average readings of the pointer for the loads w0, (w0+50), (w0+100), (w0+150) etc.
  • From this, extension, l (in m) for the loads (w0+50), (w0+100), (w0+150)   etc. , are calculated as (z1-z0), (z2-z0), (z3-z0) respectively.
  • In each case, k =mg/l is calculated. The average value of k gives the spring constant in N/m.
  • A graph is drawn with load M in kg wt along X axis and extension, l in metre along the Y axis. The graph is a straight line. The reciprocal of the slope of the graph is determined. It gives spring constant in kg wt/m. The spring constant in N/m is obtained by multiplying this with g=9.8 m/s2.

Simulator Procedure (As performed through the Online labs)

  • Select the spring for which the spring constant is to be measured, from the 'Select Spring’ drop down list.
  • Select the environment to perform the experiment from the 'Choose Environment' drop down list. 
  • Use the ‘Change hanging mass’ slider to change the mass attached at the end of the spring.
  • The spring elongates or compresses according to the addition or removal of mass attached at its end.
  • The elongation or compression of the spring is noted in the scale by using the position of the pointer attached at the end of the spring.  
  • Now, calculations are done as per the observation column and the spring constant of the selected spring can be found out.
  • Enable the ‘Show result’ checkbox to view the spring constant of the selected spring.
  • Click on the ‘Reset’ button to redo the experiment.
The document Theory & Procedure, Helical Spring Notes | Study Additional Documents & Tests for NEET - NEET is a part of the NEET Course Additional Documents & Tests for NEET.
All you need of NEET at this link: NEET
Download as PDF

How to Prepare for NEET

Read our guide to prepare for NEET which is created by Toppers & the best Teachers

Download free EduRev App

Track your progress, build streaks, highlight & save important lessons and more!

Related Searches

past year papers

,

study material

,

Exam

,

Free

,

MCQs

,

Theory & Procedure

,

Important questions

,

pdf

,

video lectures

,

Semester Notes

,

Theory & Procedure

,

Summary

,

practice quizzes

,

Sample Paper

,

Theory & Procedure

,

Helical Spring Notes | Study Additional Documents & Tests for NEET - NEET

,

Viva Questions

,

ppt

,

Extra Questions

,

mock tests for examination

,

shortcuts and tricks

,

Helical Spring Notes | Study Additional Documents & Tests for NEET - NEET

,

Previous Year Questions with Solutions

,

Helical Spring Notes | Study Additional Documents & Tests for NEET - NEET

,

Objective type Questions

;