Why the racing cars are built in streamline shape ?

Important Questions on Equilibrium of Concurrent Forces and Friction

EASY

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 7 - Equilibrium of Concurrent Forces and Friction>EXERCISE>Q 37

Why one should walk with shorter steps when walking in a slippery road ?

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 7 - Equilibrium of Concurrent Forces and Friction>EXERCISE>Q 1

What is friction ? What do you understand by 'co-efficient of friction' ? State the laws of static friction and describe suitable experiments to verify them.

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 7 - Equilibrium of Concurrent Forces and Friction>EXERCISE>Q 2

State the laws of friction and establish a relation between the angle of repose and the co-efficient of friction.

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 7 - Equilibrium of Concurrent Forces and Friction>EXERCISE>Q 3

In some cases, friction is advantageous and in some other it is disadvantageous. Cite some examples in support of the above statement. What steps are taken to obviate friction ?

HARD

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 7 - Equilibrium of Concurrent Forces and Friction>EXERCISE>Q 4

Show that the acceleration of a body sliding down an inclined plane is reduced by an amount $\mu g \cos \varphi$ due to friction, where $\mu$ is the co-efficient of friction between the body and the plane and $\varphi$, the inclination of the plane to the horizontal.

HARD

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 7 - Equilibrium of Concurrent Forces and Friction>EXERCISE>Q 5

Explain why sliding friction arises when there is relative motion or tendency of relative motion between two bodies in contact.

HARD

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 7 - Equilibrium of Concurrent Forces and Friction>EXERCISE>Q 6

Explain why it is easier to pull a body over a rough horizontal plane than pushing it over. Find the accelerations Of the body in the two cases for the same applied force.

HARD

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 7 - Equilibrium of Concurrent Forces and Friction>EXERCISE>Q 7

If you like a hold a body resting on a rough inclined plane by pulling it with a rope making an angle $\beta$ with the inclined plane, the force must lie within a definite range. Find the range.