Question Text
Question 1 :
The taxi driver has to be more careful when driving car in winter because of morning dew. That means the friction on road during winter is _______ friction during summer. Fill in the blank.<br/>
Question 2 :
Unevenness in the surfaces of the moving body and the surface on which it moves causes:
Question 3 :
Assertion: A load when lifted vertically up requires greater effort than to roll the same load up the ramp.
Reason: The work done in lifting the load vertically up is less.
Question 4 :
Assertion: Frictional force is independent of the velocity of the body.
Reason: Friction is due to surface irregularities.
Question 6 :
Assertion: Horse has to pull a cart harder during the first few steps of his motion.
Reason: The first few steps are always difficult.
Question 7 :
_______ helps in writing with a pen or pencil on a paper.
Question 8 :
The mover pushed his cart on tile floor and it went fast and easy. When he pushed his cart on carpet it was harder because there is more friction on carpet. What should he do to move his cart on carpet with equal speed?
Question 9 :
State whether the given statement is true or false :Friction is necessary to perform many tasks. 
Question 10 :
State whether the given statement is true or false :Friction is a necessary evil.
Question 11 :
A man of mass $m$ walks from end $A$ to the other end $B$ of a boat of mass $M$ and length $l$. The coefficient of friction between the man and the boat is $ \mu $ and neglect any resistive force between the boat and the water.
Question 14 :
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.