EASY

Earn 100

Give example of class II lever in human body.

Important Questions on Machines

EASY

Science>Physics>Machines>Simple Machines

Identify the class of lever shown in the diagram below.

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EASY

Science>Physics>Machines>Simple Machines

Mechanical advantage

(M A)

, Load

(L)

and effort

(E)

are related as :

HARD

Science>Physics>Machines>Simple Machines

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.

MEDIUM

Science>Physics>Machines>Simple Machines

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

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EASY

Science>Physics>Machines>Simple Machines

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.

MEDIUM

Science>Physics>Machines>Simple Machines

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

B

?
(c) If the tension is

T

, deduce the relation between

T

and

E

.
(d) What is the velocity ratio of the arrangement?
(e) Assuming that the efficiency of the system is

100 %

. What is the mechanical advantage?
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MEDIUM

Science>Physics>Machines>Simple Machines

State the class of levers and the relative positions of load

(L)

effort

(E)

and fulcrum

(F)

in a bottle opener?

EASY

Science>Physics>Machines>Simple Machines

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

MEDIUM

Science>Physics>Machines>Simple Machines

Draw a diagram of a combination of three movable pulleys with a fixed pulley showing the directions of load, effort, and tension in each strand. Find (i) mechanical advantage, (ii) velocity ratio, and (iii) efficiency of the combination in an ideal situation.

EASY

Science>Physics>Machines>Simple Machines

Draw a labelled diagram of a class II lever. Give one example of such a lever.

EASY

Science>Physics>Machines>Simple Machines

Explain why the mechanical advantage of a

Class II

type of lever is always more than one.

MEDIUM

Science>Physics>Machines>Simple Machines

State the class of levers and the relative positions of load (

L

) effort (

E

) and fulcrum (

F

) in sugar tongs .

EASY

Science>Physics>Machines>Simple Machines

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

EASY

Science>Physics>Machines>Simple Machines

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

MEDIUM

Science>Physics>Machines>Simple Machines

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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