Question Text
Question 1 :
When a body is placed on a surface, the body exerts a force in downwards direction on the surface _______ its weight on the surface. Fill in the blank. <br/>
Question 2 :
The surface of the head of a matchstick and sides of a match box are deliberately made rough to
Question 3 :
A man slides down on a telegraphic pole with an acceleration $a=g/4$. The frictional force between the man and the pole is equal to (in terms of man's weight $W$)
Question 4 :
Which is true for rolling friction $({ \mu }_{ r })$, static friction $({ \mu }_{ s })$ and kinetic friction $({ \mu }_{ k }$)?<br/>
Question 6 : <div>The taxi driver has to be more careful when driving car in winter because of morning dew. That means the friction on road during winter is _______ friction during summer. Fill in the blank.<br/></div>
Question 7 :
Assertion: Static frictional force is self adjusting, for the given two surfaces.
Reason: Sliding frictional force between two given solid surfaces is independent of surface area of contact.
Question 8 :
A body of mass 100 g is sliding from an inclined plane of inclination $\displaystyle { 30 }^{ o }$. What is the frictional force experienced, if $\displaystyle \mu =1.7$ ?
Question 10 :
State whether the statements are true or false:<br/>Oil is used to reduce the friction on door hinges.
