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11th Physics Monthly Test - 2 ( Laws of motion )

MABS Institution

11th Physics Monthly Test - 2 ( Laws of motion )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

A block of mass m is placed on a smooth wedge of inclination θ. The whole system is accelerated horizontally so that the block does not slip on the wedge: The force exerted by the wedge on the block will be (g is acceleration due to gravity)

mg cosθ
mg sinθ
mg
mg/cosθ

A body of mass 2 kg rests an a horizontal lane. It the angle of friction is 45°. The last force required to move the body long the plane is

20 N
40 N
30 N
10 N

Two masses as shown in the figure are suspended from a massless pulley. The acceleration of the system when masses are left free is

\(\frac { 2g }{ 3 } \)
\(\frac { g }{ 3 } \)
\(\frac { g }{ 9 } \)
\(\frac { g }{ 7 } \)

When milk is churned, cream gets separated due to

Centripetal force
Centrifugal force
Frictional force
Gravitational force

For a particle revolving in a circular path, the acceleration of the particle is

along the tangent
along the radius
along the circumference of the circle
zero

In non inertial frame, the second law of motion is written as

F = ma
F = ma + Fp
F = ma - Fp
F = 2ma

A particle of mass m is moving with a uniform velocity v₁. It is given an impulse such that its velocity becomes v₂ The impulse is equal to

m[|v₂|-|v₁|]
\(\frac { 1 }{ 2 } \)m[v₂²-v₁²]
m[v₁+v₂]
m[v₂-v₁]

A monkey is descending from the branch of a tree with constant acceleration. If the breaking strength is 75% of the weight of the monkey, the minimum acceleration with which monkey can slide down without branch is

g
\(\frac { 3g }{ 4 } \).
\(\frac { g }{ 4 } \)
\(\frac { g }{ 2 } \)

A 600 kg rocket is set for a vertical firing. lf the exhaust speed is 1000 ms^-1, the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is

117.6 kg s^-1
58.6 kg s^-1
6 kg s^-1
76.4 kg s^-1

Dimensions of impulse are same as that of

Force
Momentum
Energy
Acceleration

Part - B

Generic 2 - Answer All Question

You accelerate your car forward. What is the direction of the frictional force on a package resting on the floor of the car?

What is idea proposed by Aristotle and Galileo about force? (or) Give the views of Aristotle and Galileo and Newton about the motion.

What is meant by inertia of direction?
Why it is not possible to push a car from inside?

Why do the blades of an electric fan continue to rotate for sometime after the current is switched off?

Draw the graph for the variation of both static and kinetic frictional forces with external applied force?

Why is it difficult to catch a cricket ball than a tennis ball even when both are moving with the same velocity?

Part - C

Generic 3 - Answer All Question

Three blocks of masses m1 = 10 kg, m² = 20 kg are connected by strings on smooth horizontal surface and pulled by a force of 60 N. Find the acceleration of the system and frictions in the string.

The initial speed of a body of mass 2.0 kg is 5.0 ms^-1. A force act for 4s in the direction of motion of the body. The force-time graph is shown in the diagram. Calculate the impulse of the force and the final speed of the body.

The force that should be applied a body of mass 20 kg. It moves upward with an acceleration of 4 ms^-2. Find the force in the vacuum.

What is the use of airbags in car?

For the following situation, Explain with an example.
A body of mass 1.5 kg rest an a horizontal plane, and the angle of friction is 45°. Find the least force required to move the body along the plane

Smooth block is released at rest on a 45° incline and then slides a distance d. If the time taken of slide on rough incline is n times as large as that to slide than on a smooth incline. Show that coefficient of friction. \(\mu =\left( 1-\frac { 1 }{ { n }^{ 2 } } \right) \)

Part - D

Generic 5 - Answer All Question

Calculate the centrifugal force experienced by a man of 60 kg standing at Chennai. (Given: Latitude of Chennai is 13°)

Write an explanation on Newton's laws

Describe the method of measuring angle of repose.

What happens to the object at rest if (i) f_s = 0 (ii) fs = Fext (iii) fs = max.

Briefly explain what are all the forces act on a moving vehicle on a leveled circular road?

Two bodies of masses 7 kg and 5 kg are connected by a light string passing over a smooth pulley at the edge of the table as shown in the figure. The coefficient of static friction between the surfaces (body and table) is 0.9. Will the mass m₁ = 7 kg on the surface move? If not what value of m₂ should be used so that mass 7 kg begins to slide on the table?

An object of mass 5 kg is initially at rest on the surface. The surface has coefficient kinetic friction u_k = 0.6. What initial velocity must be given to the object so that it travels 10m before coming to rest?

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