What is a lever? Explain its principle.

Important Questions on Simple Machine

EASY

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

Question Image

(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.

HARD

Science>Physics>Simple Machine>Lever

The diagram below shows a pulley arrangement:

Question Image

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>Simple Machine>Lever

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>Simple Machine>Lever

The slope of an inclined plane is the tangent of the angle made by _____.

HARD

Science>Physics>Simple Machine>Lever

The resistance offered by a lemon when an effort of 0.06 N is applied. The effort arm of the squeezer is 10 cm and the load arm is 3 cm. In the length, assume that the effort is applied at the end of the effort arm.

MEDIUM

Science>Physics>Simple Machine>Lever

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

EASY

Science>Physics>Simple Machine>Lever

A gear system can be used to obtain a gain in torque if its gear ratio is _____ one.

MEDIUM

Science>Physics>Simple Machine>Lever

State the class of levers and the relative positions of load