English
Tamil Nadu Board of Secondary EducationTamil Nadu Primary School Class 4

Complete the table. - Science

Advertisements
Advertisements

Question

Complete the table.

S. No Types of Simple Machine Example
1. Pulley  
2. Wheel and axle  
3. Wedge  
4. Inclined plan  
5. Lever  
6. Screw  
Chart
Advertisements

Solution

S. No Types of Simple Machine Example
1. Pulley crane
2. Wheel and axle bicycle, grinder
3. Wedge knife, scissors, axe
4. Inclined plan ramp, slide, and slope for wheel chair
5. Lever see saw, nut cracker, and plier
6. Screw pencil sharpener, screw- jack, bottle cap, windmill
shaalaa.com
  Is there an error in this question or solution?
Chapter 3: Work and Energy - Try to Answer [Page 109]

APPEARS IN

Samacheer Kalvi Science - Term 1 [English] Class 4 TN Board
Chapter 3 Work and Energy
Try to Answer | Q 4 | Page 109

RELATED QUESTIONS

A boy uses a single fixed pulley to lift a load of 50 kgf to some height. Another boy uses a single movable pulley to lift the same load to the same height. Compare the effort applied by them. Give a reason to support your answer.


The pulley system has drawn lifts a load of 150 N when an effort of 60 N is applied. Find its mechanical advantage.


Select the correct alternative:

A pulley is used because of it


The mechanical advantage of an actual pulley is less than one. Give a reason. What is the justification for using the pulley then?


In which direction does the force need to applied, when a single pulley is used with a mechanical advantage greater than one? How can you change the direction of force applied without altering its mechanical advantage? Draw a labelled diagram of the system.


The diagram below shows a pulley arrangement.

  1. Name the pulleys A and B.
  2. In the diagram, mark the direction of tension on each strand of string.
  3. What is the purpose of the pulley B?
  4. If the tension is T, deduce the relation between
    1. T and E, and
    2. E and L.
  5. What is the velocity ratio of the arrangement?
  6. Assuming that the efficiency of the system is 100%, what is the mechanical advantage?


(a)  Fig represents an incomplete diagram of a simple string pulley      system. Copy this diagram on a new page and complete it and mark where the effort must be applied to lift the load.
(b) What is the velocity ratio of this system?
(c) If the pulley system is 80% efficient and the load is 720 N, then
    (i) What effort must be applied to lift the load?
    (ii) What work must be done must be done in lifting the load through   a distance of 2 m using this machine?


A type of single pulley is very often used as a machine even though it does not give any gain in mechanical advantage. For what purpose is such a pulley used?


Draw a diagram of a single fixed pulley and obtain expressions for its:
(i) Mechanical advantage,
(ii) Velocity ratio, and
(iii) Efficiency, in the ideal case.


State one advantage of single movable pulley.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×