Question Text
Question 1 :
You are marooned on a frictionless horizontal surface and cannot exert any horizontal force by pushing against the surface. How can you get off?
Question 3 :
Fill in the blanks<br>Dynamic Fluid friction is _______ the sliding friction of solids.
Question 5 :
State whether the given statement is true or false :Friction is a necessary evil.
Question 7 :
Friction between two surfaces can be _______ by polishing the surfaces.fill in the blank.<br/>
Question 9 :
With increase of temperature, the frictional force acting between two surfaces ....................... .<br>
Question 10 :
Arrange the level of difficulty of walking on the following surfaces in increasing order.<br/>a) On wooden floor      b) On concrete floor<br/>c) On wet marble         d) On dry marble
Question 11 :
The force of friction is ....................... the normal reaction between the surfaces.<br>
Question 13 :
When two bodies are made extra smooth the force of friction ..............
Question 14 :
Frictional force in a ceiling fan is reduced by using ....................... <br>
Question 15 :
An iron block of sides $5cm$ x $8cm$ x $15cm$ has to be pushed along the floor. The force required will be minimum when the surface in contact with the ground is
Question 17 :
Driving a car on a highway with windows open reduce the speed. This is due to:
Question 20 :
Which of the following material is likely to have least friction?
Question 21 :
The force which prevents us from slipping while walking on the road is:
Question 23 :
A block is given a initial push along rough horizontal fixed table surface and after some time it stops due to friction. For the system of block and table<br>
Question 28 :
_______ helps in writing with a pen or pencil on a paper.