Question Text
Question 1 :
If the normal force is doubled the co-efflcient of friction is
Question 2 :
A block of mass $1000\ kg$ lying steady on the horizontal surface of a table needs $200\ N$ horizontal force to came into motion. What is the coefficient of static friction between the block and the surface of table? <br>[take $g=10{ms}^{-2}$]
Question 3 :
A force of 98 newton is required to pull a body of mass $1 \times 10^2$ kg over the surface of the ice then find the coefficient of friction? (g $=$ 9.8 m s$^{-2}$)<br>
Question 4 :
If the resultant of all the external forces acting on a system of particles is zero, then from an inertial frame, one can surely say that
Question 5 :
A block of mass $1\ kg$ lies on a horizontal surface in a truck, the coefficient of static friction between the block and the surface is $0.6$. What is the force of friction on the block if the acceleration of the truck is $5\ m/s^{2}$ ?<br>(Take $g=10\ m/s^{2}$)
Question 6 :
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 7 :
<p>It is more difficult to walk on ice than on a concrete road because<br/></p>
Question 8 :
Assertion: When a person walks on a rough surface, the frictional force exerted by surface on the person is opposite to the direction of his motion.
Reason: It is the force exerted by the road on the person that causes the motion.
Question 9 :
A car turns a corner on a slippery road at a constant speed of <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e91799b67ed907b153d2b17">. If the coefficient of friction is 0.5, the minimum radius of the are in meter in which the car turns is
Question 10 :
A block of mass $5$ kg is lying on a rough horizontal surface. The coefficient of static and kinetic friction are $0.3$ and $0.1$ and $g=10ms^{-2}$. The frictional force on the block is?