Question 3 :
'The action and reaction both act simultaneously.' Is this statement true and what is the net force ?

Question 5 :
In which of the following cases the net force is not zero?

Question 6 :
A man is at rest in the middle of a pond on perfectly smooth ice. He can get himself to the shore by making use of Newton's:<br/>

Question 8 :
A ball of mass $50gm$ is dropped from a height $h=10m$. It rebounds losing 75 percent of its kinetic energy. If it remains in contact with the ground for $\Delta t=0.01$ sec., the impulse of the impact force is:

Question 9 :
A ball of mass 'm' moves with speed 'v' and it strikes normally with a wall and reflects back.If its time of contact with wall is t, then find force exerted by ball on the wall

Question 10 :
An apple falls from a tree because of gravitational attraction between the earth and apple. If $F_{1}$ is the magnitude of force exerted by the earth on the apple and $F_{2}$ is the magnitude of force exerted by apple on earth, then<br>

Question 11 :
A body of mass m is rotated at uniform speed&#160;along a vertical circle with the help of light string. If&#160;$T_{1} and \ T_{2}$ are tensions in the string when the body&#160;is crossing highest and lowest point of the vertical&#160;circle respectively, then which of the following expressions is&#160;correct?<br/>

Question 12 :
n balls each of mass m impinge elastically each second on a surface with velocity u. The average force experienced by the surface will be

Question 13 :
A block of $1\ kg$ is stopped against a wall by applying a force $F$ perpendicular to the wall. If $\mu=0.2$ then minimum value of $F$ will be :

Question 14 :
A wheel of radius r rolling on a straight line, the velocity of its centre being v. At a certain instant the point of contact of the wheel with the grounds is M and N is the highest point on the wheel(diametrically opposite to M). The incorrect statements is?

Question 15 :
A body of mass $m=10^{-2}\ kg$ is moving in medium and experiences a frictional force $F=-kv^2$. Its initial speed is $v_0=10\ ms^{-1}$. If, after $10\, s$, its energy is $\dfrac{1}{8}mv_0^2$, the value of $k$ will be :

Question 16 :
A block of mass $2\ kg$ rests on a rough inclined plane making an angle of ${30}^{o}$ with the horizontal. The coefficient of static friction between the block and the plane is $0.7$. The frictional force on the block is