1.
Explain
coefficient of friction.
2.
List
the laws of dry friction.
3.
Define
Angle of friction and Angle of Repose.
4.
What
is cone of friction?
5.
Differentiate
between static and kinetic friction.
6.
“Friction
is friend of man” comment on this statement.
7.
For
the following cases find forces P needed to just impend the motion of the
block. Take weight of block to be 100 N and coefficient of static friction at
the contact surface to be 0.4.
8.Block A of weight 2000 N is kept on a plane inclined at 350. It is connected to weight B by an in-extensible string passing over a smooth pulley. Determine weight of B so that B just moves down. Take µ = 0.2
9.
Three
blocks are placed on the surface one above the other as shown in figure. The
static coefficient of friction between the surfaces is shown. Determine the
maximum value of that can be applied before any slipping takes place.
10.
A
car of 1000 Kg mass is to be parked on the same 10o incline year
around. The static coefficient of friction between the tires and the road
varies between the extremes of 0.05 and 0.9.
Is it always possible to park the car at this place? Assume that the car
can be modeled as a particle.
11.
A
block of weight 200 N rests on a horizontal surface. The co-efficient of
friction between the block and the horizontal surface is 0.4. Find the
frictional force acting on the block if a horizontal force of 40 N is applied
to the block.
12.
Block
A of mass 27 Kg rests on block B of mass 36 Kg. Block A restrained from moving
by a horizontal rope to the wall at C. what force P, parallel to the plane inclined
at 30o with the horizontal is necessary to start B down the plane?
Assume µ for all surfaces = 0.33.
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