Which of the following helps INCREASE friction deliberately?
ASprinkling fine powder on a carrom board
BPolishing the surface
CTreading the soles of shoes
DPouring oil between moving parts
Answer & Solution
Correct answer: C. Treading the soles of shoes
Polishing, oiling and sprinkling powder are all ways to REDUCE friction. Treading the sole of a shoe deliberately INCREASES friction with the ground, giving the wearer better grip and reducing the chance of slipping.
Related questions
Two masses hang from a rope over a light frictionless pulley. Along that rope the tension Spreading out into a spread-eagle position drops that terminal speed to about:A 75 kg skydiver falling head first reaches a terminal speed of roughly:Drag also depends on the density of the fluid, the drag coefficient and the object's:At everyday speeds, drag force is proportional to the speed of the object raised to the poLike friction, the drag force on a moving object always acts to oppose its:The outward pull a rider seems to feel on a merry-go-round is mistakenly called the:A passenger feels thrown sideways when the car turns. That apparent push is an inertial or