WorksheetsClass 8 Physics Ch- Friction
Total questions: 28
Worksheet time: 7mins
Which one of the following is not a lubricant?
Oil
Water
Grease
Graphite
The frictional force on an object in a fluid depends on its _______ with respect to the fluid.
Speed
Weight
Volume
Mass
Which of the following statements is false about friction?
Friction is undesirable.
Friction is caused by the irregularities on the two surfaces in contact.
The force of friction is lesser if a rough surface is involved.
Friction is a necessary evil.
Lubricants are the substance which
Increase friction
Decrease friction
Natural
All of the above
The force of friction on a smooth surface is _____________.
Greater
Lesser
Higher
None of the above
Friction is a type of a __________.
Contact force
Magnetic force
Non-contact force
Gravitational force
The force of friction is always (a) the applied force.
Sliding friction is _________ than the static friction
less
more
equal
zero
Rolling friction is _______ than sliding and static friction
Lesser
Equal to
Greater
None of the above
The shape of an aeroplane is like a _______ to reduce the friction exerted by air.
Tortoise
Dog
Cat
Bird
Which is a/ are streamlined object?
Aeroplane
Boat
Ship
All the above
It is difficult to walk on an oily floor because
Force of friction is very less
Force of friction is very high
we don't like to walk on oily floor
None of these
What is fluid friction?
friction is friction between two surfaces that aren't moving relatively to each other
friction between a rolling object and the surface that it is rolling on
friction where an object slides rubs against another surface
friction of something going through any type of liquid or air
The body will move only when
Force of friction = applied force
Force of friction > applied force
Force of friction < applied force
All of the above
The faster you are the more air resistance
True
False
Newton
you can walk because there is friction between your __________ and ______________
ground and air
feet and ground
feet and air
air and ground
friction helps you write on a paper or black board.
true
false
When we rub our hands together _________.
frictional force works between them
energy is released
our hands become warm
all off the above
Two blocks of iron of different masses are kept on a cemented floor. Which one of them would require a larger force to move it from the rest position?
both requires same force
box A
box B
In a large commercial complex, there are four ways to reach the main road. One of the paths has loose soil, the second is laid with polished marble, the third is laid with bricks and the fourth has a gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is
polished marble
bricks
gravel
loose soil
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