Question 2 :
One of the rectangular components of a force of 50 N is 30 N. The other rectangular component will be :

Question 3 :
A high pressure tire rolls more easily than a low pressure tire because:

Question 4 :
Which type of friction occurs due to interlocking between microscopic irregularities on surfaces?

Question 5 :
When a bullet is fired from a rifle its momentum become $$20\ kg\ m/s$$. If the velocity of the bullet is $$1000\ m/s$$ what will be its mass?

Question 6 :
A car is traveling at a high speed when it banks into a sharp left turn.<br>Which of the following statements best describes the reason a passenger in the vehicle is pressed outwards against the right side of the vehicle?

Question 7 :
When a body is placed on a surface, the body exerts a force downwards ____________.

Question 8 :
Match list (I) with List (II)<br/><table class="wysiwyg-table"><tbody><tr><td>List I&#160;</td><td>List II</td></tr><tr><td>a) Recoil of gun</td><td>e) Newtons first law</td></tr><tr><td>b) Acceleration in one dimension and motion in two dimensions</td><td>f) Newtons second law</td></tr><tr><td>c) Definition of force</td><td>g) Projectile motion</td></tr><tr><td>d) Measurement of force</td><td>h) Newton&#8217;s third law</td></tr></tbody></table>

Question 9 :
Assertion: It is difficult to move a bike with its breaks on. Reason: Sliding friction is greater than rolling friction.

Question 10 :
A car is moving on a circular level road of radius of curvature $$300\ m$$. If the coefficient of friction is $$0.3$$ and acceleration due to gravity $$10\ m/s^{2}$$, the maximum speed the car can have is:<br>

Question 11 :
When you hit a wall and sponge with equal force. Which case will hurt more?

Question 13 :
In which of the following cases the net force is not zero?

Question 14 :
Spring scale reads $$20\ N$$ as it pulls a $$4.0\ kg$$ object across a table. What is the magnitude of the force exerted by object on the spring scale?

Question 16 :
A force must act on a vehicle moving on a rough road in a straight line with uniform velocity.<br>

Question 17 :
Assertion: When a gun is fired, the bullet moves forward (action). The gun recoils backward (reaction) Reason: Driving a nail into a wooden block without holding the block is difficult.

Question 19 :
A force on an object that is perpendicular to a common contact surface is called<br>

Question 22 :
To reduce the momentum of a given body to half its original value then the velocity must be __________.<br/>

Question 23 :
A force of $$10 N$$ acts on a body of mass $$20 kg$$ for $$10 s$$ .Change in its momentum is:<br/>

Question 24 :
Multiple correct answers type <br>Mark the correct statement(s) regarding friction.<br>a. Friction force can be zero, even though the contact surface is rough.<br>b. Even though there is no relative motion between surfaces, frictional force may exist between them.<br>c. The expressions $$f_L =\mu_sN$$ or $$f_k =\mu_kN$$ are approximate expressions.<br>d. The expression $$f_L =\mu_sN$$ tells that the directions of $$f_L$$ and N are the same.

Question 25 :
A body of mass M collides with a wall with velocity&#160;V and rebounds with the same speed.&#160;Its change in momentum is equal to :<br/>

Question 26 :
Assertion: Swimming is possible due to third law of motion Reason: Rebounding of rubber ball takes place due to third law of motion.

Question 27 :
'The action and reaction are equal in magnitude'. Is this statement true and which law is related with it ?

Question 28 :
When one body rolls over the surface of another body, which kind of friction does it produce?

Question 29 :
It &#160;is difficult for a fireman to hold a hose pipe which ejects large amounts of water at high velocity due to :<br/>

Question 30 :
When a body is placed on a surface, the body exerts a force in _________ direction on the surface. Fill in the blank.&#160;<br/>