Which one of the following is incorrect about friction?
The frictional force is independent of the shape of the object in any fluid.
The sliding friction between two surfaces is indeed slightly less than the static friction between the same surfaces, so this statement is true.
Rolling friction is indeed less than sliding friction, which is why wheels and ball bearings are used to reduce friction, so this statement is true.
The frictional force experienced by an object moving through a fluid depends on the shape of the object, since a streamlined shape experiences much less resistance than an irregularly shaped object, so the statement that this force is independent of shape is incorrect.
Friction always acts on both the surfaces in contact, opposing their relative motion, so this statement is true.
Hence, the incorrect statement about friction is that the frictional force is independent of the shape of the object in a fluid.
Similar Questions
Which of the following statements are true?
(A) A force can act on an object with or without being in contact with it
(B) Earth's molten metallic core is the origin of the magnetic field
(C) Gravitational forces is one of the strongest forces
(D) Nuclear forces are weakest of fundamental forces
Important Questions from Forces
Which of the following physical quantity is responsible for opening the lid of a bottle?
The use of lubricants makes the surface-
- While pulling or lifting an object, negative work is done by _______.
If a box of mass 25 kg is pushed 15 m by a force of ‘F’ N and work done in the process is 480 J. Find F:
If an object moves in a circular path with uniform ________, its motion is called uniform circular motion
