Which of the following produces least friction? - Rolling friction
Friction always - opposes the motion
Friction can be reduced by using - all of these
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play - irrespective of whether the objects are solid, liquid or gaseous.
To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable? - Stone
The shape of an aeroplane is like a - bird
Friction is - both (a) and (b)
Friction due to fluids is called - drag
Which of the following is not a smooth surface? - Surface of tyres
A toy car released with the same initial speed will travel farthest on - polished marble surface
If we apply oil on door hinges, the friction will - decrease
Lubricant - reduce friction
Force of friction depends on - all of these
Force of friction depends on - all of these
Fluids are - both (a) and (b)
Which is a streamlined object? - All of these
Smooth surface has - less friction
Which of the following is responsible for wearing out of bicycle tyres? - Frictional force
It is difficult to walk on an oily floor because - Force of friction is very less
Spring balance is a device used for measuring the _____________ acting on an object. - force
What kind of substances are known as lubricants - Decrease friction
Rolling friction is smaller than? - All the above
Static friction is less than - none of these
A force that opposes the motion of one surface sliding over another is called: - Friction
Which of the following is the greatest: - Limiting friction
What type of frictional force comes into play in case of a car moving on a straight road: - Rolling friction
Name the force responsible to fall down a boy when he steps on a banana peel. - Force of friction
What type of frictional force comes into play when wheat is grinded in floor mill: - Sliding friction
An object at rest on a floor, a force is applied to move that object which friction force will come into action at this moment? - Static friction
