EASY

Earn 100

What are the functions of gears?

Important Questions on Machines

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

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.

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

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

Draw Diagrams to illustrate the position of fulcrum load and effort, in the following:
Forceps .

EASY

Science>Physics>Machines>Simple Machines

Which type of lever has a mechanical advantage always more than one? Give one example. What change can be made in this lever to increase its mechanical advantage?

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 .

MEDIUM

Science>Physics>Machines>Simple Machines

Draw Diagrams to illustrate the position of fulcrum load and effort, in the following :
A seesaw .

HARD

Science>Physics>Machines>Simple Machines

Observe the arrangement of gears in the figure. When the first gear is rotated, which other gear would also rotate in the same direction?

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EASY

Science>Physics>Machines>Simple Machines

How do gears transfer power from one part to another part of the machine?

EASY

Science>Physics>Machines>Simple Machines

Draw a labelled sketch of a

class III

lever. Give one example of this kind of lever.

MEDIUM

Science>Physics>Machines>Simple Machines

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.

EASY

Science>Physics>Machines>Simple Machines

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

EASY

Science>Physics>Machines>Simple Machines

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

EASY

Science>Physics>Machines>Simple Machines

Explain how gears can be used to change the speed?

EASY

Science>Physics>Machines>Simple Machines

Explain why the mechanical advantage of a