Question 1 :
It is easier to pull a lawn roller than to push it because pulling :<br>

Question 3 :
Which of the following are done to reduce friction?<br/>a)&#160;Making grooves in the shoes<br/>b)&#160;Polishing rough surfaces<br/>c) Using wheels, ball bearings<br/>d)&#160;Creating an air cushion

Question 4 :
Match the following<br/><table class="wysiwyg-table"><tbody><tr><td></td><td>List I</td><td></td><td>List II</td></tr><tr><td>1</td><td>Streamlined body structure</td><td>a</td><td>Less no. of irregularities</td></tr><tr><td>2</td><td>Pressing two objects harder against each other</td><td>b</td><td>Lubricant</td></tr><tr><td>3</td><td>Grease</td><td>c</td><td>Increase friction</td></tr><tr><td>4</td><td>Smooth surface</td><td>d</td><td>Decrease friction</td></tr></tbody></table>

Question 6 :
In which of the following cases is friction a disadvantage to us ?

Question 7 :
A body is moving along a rough horizontal surface with an initial velocity <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e917a4167ed907b153d2ba2">. If the body comes to rest after travelling <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e917a411a95347cde4a1116">, then the coefficient of sliding friction will be

Question 8 :
Assertion: A block of mass $m$ starts moving on a rough horizontal surface with a velocity $v$. It stops due to friction between the block and the surface after moving through a certain distance. The surface is now tilted to an angle of ${30}^{o}$ with the horizontal and the same block is made to go up on the surface with the same initial velocity $v$. The decrease in the mechanical energy in the second situation is smaller than that in the first situation. Reason: The coefficient of friction between the block and the surface decreases with the increase in the angle of inclination

Question 9 :
A stone is dropped from a height {tex} h . {/tex} It hits the ground with a certain momentum {tex} P {/tex}. If the same stone is dropped from a height {tex} 100 \% {/tex} more than the previous height, the momentum when it hits the ground will change by:

Question 10 :
The force required to just move a body up the inclined plane is double the force required to just prevent the body from sliding down the plane. The coefficient of friction is {tex} \mu . {/tex} The inclination {tex} \theta {/tex} of the plane is