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11th Physics Weekly Test - 1 ( Laws of motion )

MABS Institution

11th Physics Weekly Test - 1 ( Laws of motion )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Three masses is contact as shown. It force F is applied to mass m₁, then the contact force acting on mass m₃ is

\(\frac { F }{ { m }_{ 1 }+{ m }_{ 2 }+{ m }_{ 3 } } \)
\(\frac { { m }_{ 1 }F }{ \left( { m }_{ 1 }+{ m }_{ 2 }+{ m }_{ 3 } \right) } \)
\(\frac { ({ m }_{ 2 }+{ m }_{ 3 })F }{ \left( { m }_{ 1 }+{ m }_{ 2 }+{ m }_{ 3 } \right) } \)
\(\frac { { m }_{ 3 }F }{ { m }_{ 1 }+{ m }_{ 2 }+{ m }_{ 3 } } \)

When a car is moving on a circular track the centripetal force is due to

gravitational force
frictional force
magnetic force
elastic force

Friction can be reduced by

polishing
lubricating
using ball bearings
all the above

When a force is applied on a body, it can change

velocity
momentum
direction of motion
all the above

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

If the lines of forces act in the same plane, they can be

concurrent forces
coplanar forces
either concurrent force or coplanar forces
Lami's force

A book lying on the table continues in its state of rest unless an external force acts on it. It is due to:

inertia of rest
inertia of motion
inertia of direction
both (b) and (c)

A rocket with a lift off mass 2.5 \(\times\) 10⁴kg is blast upward with an initial acceleration of 5m/s²Then the initial thrust of the blast is

1.75 \(\times\)10⁵N
7 \(\times\)10⁵N
37.5\(\times\) 10⁵N
14 \(\times\)10⁵N

The motion of a rocket is based on the principle of conservation of

Linear momentum
K.E
Mass
Angular momentum

No force is required for

an object moving in circular motion.
an object moving in straight line with constant velocity.
an object moving with constant acceleration.
an object moving in elliptical pattern

Part - B

Generic 2 - Answer All Question

A bus weighing 900 kg is at rest on the bus stand. What is the linear momentum of the bus?

State Aristotelian law of motion. What is flaw in this law.
What do you mean by Inertia of direction? Given one example.

Proper inflation of tyres of vehicles saves fuel. Why?

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

Part - C

Generic 3 - Answer All Question

A cricket ball of mass 35 g hits a stumps at an angle of 30° with a velocity of 20 m/s. If the ball rebounds at 60° the to the direction of incidence, calculate the impulse received by the cricket ball.

What is the use of airbags in car?

Two blocks of mass 2 kg and 5 kg are connected by an ideal string passing over a pulley, The block of mass 2 kg is free to slide on a surface inclined at an angle of 30° with the horizontal whereas 5 kg block hangs freely, Find the acceleration of the system and the tension in the string.
State the empirical laws of static and kinetic friction

The rear side of a truck is open and a box of 40 kg mass is placed 5m away from the open end. The coefficient of friction between the box and the surface below it is 0.15 on a straight road, the truck starts from rest and accelerates with 2 m/s². At what distance from the starting point does the box fall off the truck? (ignore the size of the box)

Part - D

Generic 5 - Answer All Question

Prove the law of conservation of linear momentum. Use it to find the recoil velocity of a gun when a bullet is fired from it.

Consider an object of mass 2 kg resting on the floor. The coefficient of static friction between the object and the floor is μ_s = 0.8. What force must be applied on the object to move it?

If a stone of mass 0.25 kg tied to a string executes uniform circular motion with a speed of 2 m s^-1 of radius 3 m, what is the magnitude of tensional force acting on the stone?
Derive an expression for the acceleration of the body sliding down a frictionless surface.

A gun weighing 25 kg fires a bullet weighing 30 g with the speed of 200 ms^-1. What is the speed of recoil of the gun.

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