A gear system has one wheel with 15 teeth and the other wheel with 60 teeth. Calculate what gain in speed and the gain in torque you can obtain from this system.

Gain in speed: Number of teeth in driving wheel = 60 Number of teeth in driven wheel = 15 We know that, G a i n i n s p e e d = N u m b e r o f t e e t h i n d r i v i n g w h e e l N u m b e r o f t e e t h i n d r i v e n w h e e l G a i n i n s p e e d = 60 15 G a i n i n s p e e d = 4 Gain in torque: Number of teeth in driving wheel = 60 Number of teeth in driven wheel = 15 We know that, G a i n i n t o r q u e = N u m b e r o f t e e t h i n d r i v e n w h e e l N u m b e r o f t e e t h i n d r i v i n g w h e e l G a i n i n s p e e d = 15 60 G a i n i n s p e e d = 0 . 25

E M B I B E

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 2 - Machines>QUESTIONS>Q 24

HARD

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IMPORTANT

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A man applies the effort of $150 N$ on one end of a fixed pulley to pull a bucket of water of mass $12 kg$ . What is the force of friction, mechanical advantage and efficiency of this pulley?

Important Questions on Machines

HARD

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 2 - Machines>QUESTIONS>Q 25

A gear system has one wheel with

15

teeth and the other wheel with

M . A = \frac{L o a d}{E f f o r t} M . A = \frac{120}{150} M . A = 0.8

teeth. Calculate what gain in speed and the gain in torque you can obtain from this system.

HARD

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IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 2 - Machines>QUESTIONS>Q 26

The figure given below shows a system of four pulleys. The upper two pulleys are fixed, and lower two pulleys are movable. Draw a string around the pulleys. Mark the position of effort to be applied. What is the mechanical advantage of this system.

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10th ICSE

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S CHAND'S ICSE PHYSICS BOOK 2>Chapter 2 - Machines>QUESTIONS>Q 26

The figure given below shows a system of four pulleys. The upper two pulleys are fixed, and lower two pulleys are movable. Draw a string around the pulleys. Mark the position of effort to be applied. What is the velocity ratio of this system.

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MEDIUM

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S CHAND'S ICSE PHYSICS BOOK 2>Chapter 2 - Machines>QUESTIONS>Q 27

The figure given below shows a system of five pulleys.The upper three pulleys are fixed, and lower two pulleys are movable. Draw a string around the pulleys. Mark the position of effort to be applied. What is the velocity ratio of this system and mechanical advantage of this system?

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