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Physics 9 Chapter 3 - Dynamics - 22
1.
What does a cyclist apply to stop his bicycle?
a) Pedals
b) Shacks
c) Brakes
d) All of these
2.
Why is it easy to roll a cylindrical eraser on a paper sheet than to slide it?
a) Because rolling friction is much less than sliding friction
b) Because cylinder can slide easily
c) None of these
d) Because rolling friction is much larger than sliding friction
3.
Do we roll or slide the eraser to remove the pencil work from our notebook?
a) Slide
b) None of these
c) Roll
d) Place on the pencil work
4.
Which of the following velocity components the wheels of a moving vehicle have?
a) (d) Motion of wheels about their axis
b) (c) Rotation of wheels about their axis
c) (b) Motion of wheels along the road
d) (a) Both b and c
5.
What are the disadvantages of friction?
a) All of these
b) In machines, friction causes wear and tear of moving parts
c) Most of our useful energy is lost as heat and sound due to friction
d) Friction limits the speed of moving objects
6.
What is the disadvantage of friction?
a) We can write if there would be no friction between paper and pencil
b) Friction limits the speed of moving objects
c) Friction does not enable us to walk on the ground
d) Birds could not fly
7.
What is the disadvantage of friction?
a) Most of our useful energy is lost as heat and sound due to friction
b) Birds could not fly
c) We can write if there would be no friction between paper and pencil
d) Friction does not enable us to walk on the ground
8.
What is the disadvantage of friction?
a) We can write if there would be no friction between paper and pencil
b) Birds could not fly
c) In machines, friction causes wear and tear of moving parts
d) Friction does not enable us to walk on the ground
9.
In which case do you need smaller force?
a) Both rolling and sliding
b) Rolling
c) Sliding
d) None of these
10.
How many velocity components the wheels of a moving vehicle have?
a) One
b) Three
c) Two
d) Four
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