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

Complete the table.

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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
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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
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Chapter 3: Work and Energy - Try to Answer [Page 109]

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

RELATED QUESTIONS

What is the justification for using the pulley then ?


Answer the following in short.

Explain the various functions that a machine can perform.


Name the type of single pulley that can act as a force multiplier. Draw a labelled diagram of the pulley mentioned by you.


Differentiate between a single fixed pulley and a single movable pulley.


A block and tackle pulley system has a velocity ratio 5. Draw a labelled diagram of this system.  In your diagram, indicate clearly the points of application and the directions of the load and effort.


Give reason for the following:

In case of a block and tackle arrangement, the mechanical advantage increases with the increase in the number of pulleys.


Give reason for the following:

The lower block of a block and tackle pulley system must be of negligible weight


In a single fixed pulley, If the effort moves by a distance y downwards, by what height is the load raised?

(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?


Draw the diagram of a single movable pulley and obtain its mechanical advantage, velocity ratio, and efficiency.


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