Font size
WorksheetsFriction
Total questions: 25
Worksheet time: 13mins
Friction is a
non-contact force
contact force
magnetic force
electrostatic force
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
only if the objects are solid
only if one of the two objects is liquid
only if one of the two objects is gaseous
irrespective of whether the objects are solids, liquids or gases
Two blocks of iron of different masses are kept on a cemented floor as shown in the figure. Which one of them would require a larger force to move it from the rest position? Block 1 or Block 2 ?
(a)
Which of the following produces least friction?
Sliding friction
Rolling friction
Composite friction
Static friction
Friction always
(a) opposes the motion
(b) helps the motion
(c) both (a) and (b)
(d) none of these
Friction can be reduced by using
oil
grease
powder
all of these
Static friction is less than
(a) sliding friction
(b) rolling friction
(c) both (a) and (b)
(d) none of these
The shape of an aeroplane is like a
Dog
Bird
Car
All of These
Friction is
(a) Foe
(b) Friend
(c) A necessary
(d) All of These
Friction due to fluids is called
force
pressure
friction
drag
Which of the following is not a smooth surface?
Surface of wet soap
Surface of tyres
Glazed tiles
Surface of mirror
A toy car released with the same initial speed will travel farthest on
muddy surface
polished marble surface
cemented surface
brick surface
If we apply oil on door hinges, the friction will
increase
decrease
disappear altogether
will remain unchanged
Lubricant (s)
(a) reduce friction
(b) increase friction
(c) both (a) and (b)
(d) none of these
Force of friction depends on
roughness of surface
smoothness of surface
inclination of surface
all of these
Fluids are
liquids
gases
Both Liquid and Gas
None of these
In this figure, a boy is shows pushing the box from right to left.
The force of friction will act on the box
(a) from right to left
(b) from left to right
(c) vertically downwards
(d) vertically upwards
Which of the following is responsible for wearing out of bicycle tyres?
(a) Muscular force
(b) Magnetic force
(c) Frictional force
(d) Electrostatic force
It is difficult to walk on an oily floor because
(a) Floor gets spoiled
(b) There is more resistance
(c) Force of friction is high
(d) Force of friction is very less
Which of the following statements is incorrect?
Friction acts on a ball rolling along the ground
Friction acts on a boat moving on water
Friction acts on a bicycle moving on a smooth road
Friction does not act on a ball moving through air
A matchstick struck on a matchbox catches fire easily because
Friction may cause fire
Of chemical reaction
Both of these
None of these
Tyres are treaded to
look good
Increase friction
increase its longevity
increase weight of the tyre
Lubricants are substances which
Increase friction
Are used to light fire
Reduce friction
Are used to put out a fire
Sliding friction is _________ than / to rolling friction
smaller
greater
equal
none of the above
A boat or an aeroplane has a pointed or tapering front / head. Why?
To increase the friction of fluid
To look good
To reduce the friction of fluid
For no reason
