In the following table, every entry on the left column can match with any number of entries on the right side. Pick up all those and write respectively against A, B, C and D Sr.no Name of the force Sr.no Type of the force A Force due to tension in a string P EM force B Normal force Q Reaction force C Frictional force R Conservative force D Resistive force offered by air or water for objects moving through it S Non- conservative force.

Force due to tension in a string- Reaction force, Non-conservative force. Normal force- Reaction force, Non-conservative force. Frictional force-Reaction force, Non-conservative force. Resistive force offered by air or water for objects moving through it-Reaction force, Non-conservative force.

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Consider following forces: $(w)$ Force due to tension along a string, $(x)$ Normal force given by a surface, $(y)$ Force due to air resistance and $(z)$ Buoyant force or upthrust given by a fluid. Which of these are electromagnetic forces?

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Important Questions on Laws of Motion

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Physics>Chapter 4 - Laws of Motion>Exercises>Q 1

At a given instant three point masses

m, 2 m

and

3 m

are equidistant from each other. Consider only the gravitational forces between them. Select correct statement/s for this instance only:

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Physics>Chapter 4 - Laws of Motion>Exercises>Q 1

The rough surface of a horizontal table offers a definite maximum opposing force to initiate the motion of a block along the table, which is proportional to the resultant normal force given by the table. Forces

F 1

and

F 2

act at the same angle

θ

with the horizontal and both are just initiating the sliding motion of the block along the table. Force

F 1

is a pulling force while the force

F 2

is a pushing force.

F 2 > F 1

, because

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Physics>Chapter 4 - Laws of Motion>Exercises>Q 1

A mass

2 m

moving with some speed is directly approaching another mass

m

moving with double speed. After some time, they collide with coefficient of restitution

0.5

. Ratio of their respective speeds after collision is

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Physics>Chapter 4 - Laws of Motion>Exercises>Q 1

A uniform rod of mass

2 m

is held horizontally by two sturdy, practically inextensible vertical strings tied at its ends. A boy of mass

3 m

hangs himself at one third length of the rod. Ratio of the tension in the string close to the boy to that in the other string is

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Physics>Chapter 4 - Laws of Motion>Exercises>Q 1

Select WRONG statement about centre of mass:

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Physics>Chapter 4 - Laws of Motion>Exercises>Q 1

For which of the following objects will the centre of mass NOT be at their geometrical centre?

(1) An egg

(2) a cylindrical box full of rice

(3) a cubical box containing assorted sweets

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Physics>Chapter 4 - Laws of Motion>Exercises>Q 2

In the following table, every entry on the left column can match with any number of entries on the right side. Pick up all those and write respectively against A, B, C and D

Sr.no	Name of the force	Sr.no	Type of the force
A	Force due to tension in a string	P	EM force
B	Normal force	Q	Reaction force
C	Frictional force	R	Conservative force
D	Resistive force offered by air or water for objects moving through it	S	Non- conservative force.

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Physics>Chapter 4 - Laws of Motion>Exercises>Q 2

In real life objects, never travel with uniform velocity, even on a horizontal surface, unless something is done? Why is it so? What is to be done?

Consider following forces: (w) Force due to tension along a string, (x) Normal force given by a surface, (y) Force due to air resistance and (z) Buoyant force or upthrust given by a fluid. Which of these are electromagnetic forces?

Important Questions on Laws of Motion

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Consider following forces: $(w)$ Force due to tension along a string, $(x)$ Normal force given by a surface, $(y)$ Force due to air resistance and $(z)$ Buoyant force or upthrust given by a fluid. Which of these are electromagnetic forces?