EASY

Earn 100

The weight of the pulley does not have any effect on the efficiency of a machine.

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Important Questions on Simple Machine

MEDIUM

Science>Physics>Simple Machine>Pulley

How is it possible to increase the M.A. of the given lever without increasing its length?

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EASY

Science>Physics>Simple Machine>Pulley

Mechanical advantage

(M A)

, Load

(L)

and effort

(E)

are related as :

HARD

Science>Physics>Simple Machine>Pulley

The diagram below shows a pulley arrangement:

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Copy the diagram and mark the direction of tension on each stand of the string.
What is the velocity ratio of the arrangement?
If the tension acting on the string is $T$ , then what is the relationship between $T$ and effort $E$ ?
If the free end of the string moves through a distance $x$ , find the distance by which the load is raised.

EASY

Science>Physics>Simple Machine>Pulley

Identify the class of lever shown in the diagram below.

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EASY

Science>Physics>Simple Machine>Pulley

The diagram below shows a claw hammer used to remove a nail:

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(i) To which class of lever does it belong?
(ii) Give one more example of the same class of lever mentioned by you in (i) for which the mechanical advantage is greater than one.

EASY

Science>Physics>Simple Machine>Pulley

Give reason for the following:
In a single fixed pulley, the velocity ratio is always more than the mechanical advantage.

EASY

Science>Physics>Simple Machine>Pulley

Classify the following into lever as class I, class II or class III: a catapult.

MEDIUM

Science>Physics>Simple Machine>Pulley

The diagram alongside shows an arrangement of three pulleys A, B, and C. The load is marked as

L

and the effort as

E

.
(a) Name the pulleys A, B, and C.
(b) Mark in the diagram the directions of load (

L

), effort (

E

) and tension

T_{1}

and

T_{2}

in the two strings.
(c) How are the magnitudes of

L

and

E

related to the tension

T_{1}

?
(d) Calculate the mechanical advantage and velocity ratio of the arrangement.
(e) What assumptions have you made in parts (c) and (d)?
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EASY

Science>Physics>Simple Machine>Pulley

Name the pulley which has no gain in mechanical advantage. Explain, why is such a pulley then used?

EASY

Science>Physics>Simple Machine>Pulley

Class III levers have mechanical advantage less than one. Why are they then used?

EASY

Science>Physics>Simple Machine>Pulley

Explain why the mechanical advantage of a

Class II

type of lever is always more than one.

EASY

Science>Physics>Simple Machine>Pulley

Explain why the mechanical advantage of the

class III

type of lever is always less than

1

EASY

Science>Physics>Simple Machine>Pulley

Name the three classes of levers and distinguish between them. Give two examples of each class.

MEDIUM

Science>Physics>Simple Machine>Pulley

A man uses a crowbar of length

1.5 m

to raise a load of

75 kgf

by putting a sharp edge below the bar at a distance

1 m

from his hand. Draw a diagram of the arrangement showing the fulcrum (F), load (L) and effort (E) with their directions. State the kind of lever. Calculate: (i) load arm, (ii) effort arm, (iii) mechanical advantage and (iv) the effort needed.

MEDIUM

Science>Physics>Simple Machine>Pulley

The diagram below shows a pulley arrangement.
(a) In the diagram, mark the direction of tension on each strand of string.
(b) What is the purpose of the pulley