**Inclined Plane Viva Questions with Answers**

*(i) What do you understand by an inclined plane?*

Ans: It is a smooth plane hinged to the base, so that it can
be set at any desired angle.

*(ii) Why do you oil the pulley and the axle of the roller?*

Ans: To eliminate friction

*(iii) The roller of weight W is in equilibrium on a smooth inclined plane of angle*

*θ, and the effort ‘P' is required to keep the roller in equilibrium. How are they related*

Ans: P = W sinθ

*(iv) What is the shape of the graph and between P and sin*

*θ?*

Ans: The graph is a straight line.

*(v) What is the significance of the slope of the graph?*

Ans: The slope of the graph gives the weight of the roller

*(vi) What is the mechanical advantage of the inclined plane?*

Ans: It is the ratio of the weight of the roller to the
effort. M.A = W/p

*(vii) Theory of Inclined Plane Experiment?*

If P is the force
(effort) applied parallel to an inclined plane upwards on a roller of mass m
just to keep roller in equilibrium, then,

P = mg sin θ; where mg sin 0 is the component of
the gravitational force (ie., the component of the weight W of the roller)
acting downwards along the inclined plane. P ∝ sin θ; where sin θ
=h/

*l*;*l*is the length and h the height of the plane.

*(viii) Procedure of Inclined Plane Experiment?*

The weight w of the scale pan is found out by a common
balance The plane is adjusted to a convenient angle θ. The roller is placed on the
plane and the pulley adjusted to make the string parallel to plane. Weight w

_{1}is placed in the pan to make the roller just move up the plane with a uniform speed. Next, keeping the roller near the top edge of the plane, the weight w_{2}required in the scale pan to make the roller just to move down with uniform speed is found out. The mean effort,
P= [(w

_{1}+ w_{2})/2] + w
The downward force along the inclined plane acting on the
roller on account of the gravitational force, i.e., mg sin θ,
is equal to the effort P.

P = mg sin θ;

where m = W, is the mass of the roller.

To find sin θ, the length

*l*and the height h of the plane are measured. Then, sin θ is calculated from the equation.
sin θ = (h/

*l*)
The experiment is repeated for different angles of the
plane. A graph is drawn with P along the Y-axis and sin θ along the X-axis. The graph
is found to be straight line. This shows that P which is equal to the component
of the weight of the roller along the plane is directly proportional to the
sine of the angle of the inclined plane. The slope of the graph gives the
weight of the roller.

The angle θ of the plane is noted from the value
of sin θ
(Use scientific calculator or logarithm table). A graph is drawn with P and θ.
The graph is a curve bent downward. This gives the relation between the components
of the weight of the roller along the plane at the angle of the plane.

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