Question 1 :
A solid sphere, a hollow sphere and a ring, all having equal mass and radius, are placed at the top of an incline and released. The friction coefficients between the objects and the incline are equal but not sufficient to allow pure rolling. The greatest kinetic energy at the bottom of the incline will be achieved by:

Question 2 :
Match the following<table class="wysiwyg-table"><tbody><tr><td>List I</td><td>List II</td></tr><tr><td>a. frictional force</td><td>e. reduction of friction</td></tr><tr><td>b. rolling friction</td><td>f. causes wear and tear</td></tr><tr><td>c. ball bearing</td><td>g. less than kinetic friction</td></tr><tr><td>d. trading of surface</td><td>h. increase of friction&#160;</td></tr><tr><td><br/></td><td><br/></td></tr></tbody></table>The correct match is

Question 3 :
Four children were asked to arrange friction due to rolling, static and sliding in a decreasing order. Their arrangements are given below. Choose the correct arrangement.

Question 4 :
A system shown in the figure. Assume that cylinder remains in contact with the wedge and block hence the velocity of cylinder is<br> <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/NEET/5e105215ed6e36502132f889' />

Question 7 :
An unbanked curve has a radius of $60m$. The maximum speed at which a car can make a turn if the coefficient of static friction is $0.75$, is

Question 8 :
If the normal force is doubled, the co-efficient of friction is?

Question 10 :
A book of weight $20$ $N$ is pressed between two&#160;hands and each hand exerts a force of $40$ $N$. If&#160;the book just starts to slide down, then the coefficient&#160;of friction is