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Machines

Question

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A block and tackle pulley system has a velocity ratio 3.

i) Draw a labelled diagram of this system. In your diagram, indicate clearly the points of application and the direction of the load and effort.

ii) Why should the lower block of this pulley system be of negligible weight.

Solution

i)
The labelled diagram of the pulley system is as shown below:

ii) The lower block of this pulley system be of negligible weight to increase the efficiency of the system.

Some More Questions From Machines Chapter

In what way does an ‘Ideal machine’ differ from the Practical machine.

Can a simple machine act as a force multiplier and a speed multiplier at the same time?

Which class of lever found in the human body is being used by a boy:

i) When he holds a load on the palm of his hand.
ii) When he raises the weight of his body on his toes?

What is the principle of an ideal machine?

For a given height, ………… the length l of the inclined plane, lesser will be the effort required.

Two forces each of 5 N act vertically upwards and downwards respectively on the the two ends of a uniform metre rule which is placed at its mid-point as shown in the diagram. Determine the magnitude of the resultant moment of these forces about the mid-point?

Draw a diagram to show how a single pulley can be used so as to have its ideal M.A. = 2

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