WORK SHEET : No.1
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Subject: PHYSICS
A 100 km h-1 wind blows normally against one wall of a house with an area of 50 m2. Calculate
the force exerted on the wall if the air moves parallel to the wall after striking it and has a
density of 1.134 kg m-3.
Two blocks connected by a chord passing
Over a small frictionless pulley rest on
Frictionless planes as shown in figure.
(i)
Which way will the system move?
(ii)
What is the acceleration of the blocks?
(iii)
What is the tension in the chord?
A block of mass M is pulled along a horizontal frictionless by a rope of mass m. If a force P is
applied at the free end of the rope, what will be the force exerted by the rope on the block?
A block of mass 2 kg rests on the floor. The coefficient of static friction is 0.4. What is the force
of friction between the block and the floor when a horizontal force P of (i) 2 Newton Iii) 8
Newton is applied.(Suppose g to be equal to 10 metre/sec2).
A body of mass 2 kg is acted upon by two forces. A force of 8 Newton acts along positive
direction of X-axis and another force of 6 Newton along positive direction of Y-axis. What is the
acceleration of the body?
A piece of ice slides down a 45°inclined plane in twice the time it takes to slide down a
frictionless 45°inclined plane. What is the coefficient of kinetic friction between ice and inclined
plane?
A block of mass 2 kg slides down an inclined plane which makes an angle of 30° with the
horizontal. The coefficient of friction between the block and the surface is √3/2.
(i)
What force must be applied to the block so that the block moves down the plane
without acceleration?Type equation here.
(ii)
What force should be applied to the block so that it can move up without any
acceleration?
(iii)
Calculate the ratio of the powers needed in the above two cases, if the block moves
with the same speed in both the cases.
A block of mass 2 kg rests on a plane inclined at an angle of 30° with the horizontal. The
coefficient of friction between the block and the surface is 0.7. What will be the force of friction
acting on the block?
A body of mass 2 kg wt is hung on a spring balance mounted vertically in lift. What will be the
reading on the spring balance if the lift descends with an acceleration equal to the acceleration
due to gravity `g’?
A homogeneous chain of length l lies on a table. What is the maximum length l, of the chain
that can hang over the table if the coefficient of friction is µ?
A cart with a mass M=1/2 kg is connected
by a string to a weight of mass m= 200 g.
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At the initial moment the cart moves to the
Left along a horizontal plane at a speed
Vo =7 ms-1. Find the magnitude and
Direction of the cart, the place where it
Will be and the distance covered by
It in t=5s.
Three equal weights A,B,C of mass
2 kg each are hanging on a string
Passing over a fixed pulley which is
Frictionless as shown in the figure.
What will be the tension in the string
Connecting weight B and C?
Three blocks A,B and C
Weighing 1,8 and 27 kg respectively
Are connected as shown in the figure
With an inextensible string and are
Moving on a smooth surface. T3
Is equal to 36 Newton. Find T2?
Two blocks A and B of masses m1=4 kg
And m2=8 Kg are connected as shown
In figure. Find the force P required to
Move B to the right with uniform
Speed. Disregard the mass of the
Pulley and assume it to be frictionless.
The coefficient of friction between
All surfaces is µ= 0.25.
A cart of mass M has a block of mass m attached to it is shown in the figure. The coefficient of
friction between the block and the cart is µ. Find the minimum acceleration of the cart so that
the block m does not fall?
THE PICTURES FOR SOME QUESTIONS ARE GIEN BELOW:::::