11th Physics Monthly Test - 3 ( Laws of motion )

MABS Institution

11th Physics Monthly Test - 3 ( Laws of motion )-Aug 2020

Time : 2.00 Hours

Part - A

Generic 2 - Answer All Question

The outer edge of a rotating platform is inclined upwards. Why?

With an example, explain a situation where force and motion are not in the same direction.

Imagine that the gravitational force between Earth and Moon is provided by an invisible string that exists between the Moon and Earth. What is the tension that exists in this invisible string due to Earth's centripetal force? (Mass of the Moon = 7.34\(\times\)10²²kg, Distance between Moon and Earth = 3.84 \(\times\) 10⁸m)

Give reason. f_s = μ_s.N

Explain the term "maximal static friction".

The distance travelled by a moving body is directly proportional to time. Is any external force acting on it?

Write the expression for Impulse in terms of average force.

What is the angle between frictional force and instantaneous velocity of a body moving over a rough surface?

A force \(\vec { F } =(6\hat { i } -8\hat { j } +10\hat { k } )\) N produces acceleration of 1 m/s² in a body. Calculate the mass of the body.

A body is just sliding down an inclined plane due to its own weight. What is the relation between angle of inclination and angle of repose?

What do you mean by Inertia of direction? Given one example.

"Force and motion acts in the same direction". Give example.

Why is it necessary to bend knees while jumping from greater height?

Wheels are made circular. Why?

Part - B

Generic 3 - Answer All Question

State Newton's third law.

A man getting out of a moving bus runs in the same direction for a certain distance. Comment.

In what ways the force changes the velocity of a particle?

A boy throws ball of mass 100 g with a speed of 15 m/s, If the ball hits a wall and rebounds with the half the original speed, what is the change in momentum of the ball?

State the empirical laws of static and kinetic friction

State Newton's second law.

A ball of mass 1kg hangs in equilibrium from two strings OA and OB as shown in the diagram. What are the tensions in strings OA and OB? Take g = 10 ms^-2.

A monkey climbs down a rope which can withstand a maximum tension equal to 1 - 2^nd the weight of the monkey. Calculate the minimum acceleration with which the monkey should climb down the rope.

A helicopter of mass 2000 kg rises with a vertical acceleration of 15 m/s². The total mass of the crew and passengers is 500 kg. Give the magnitude and direction of the:
(i) Force on the floor of the helicopter by the crew and passenger.
(ii) Action of the rotor of the helicopter on the surrounding air
(iii) Force on the helicopter due to the surrounding air (g = 10 m/s²)

A force of 36 dynes is inclined to the horizontal at an angle of 60°. Find the acceleration in a mass of 18 g that moves in a horizontal direction.

Determine the angle of banking so as to minimize the wear and tear of the tyres of a car negotiating a banked curve.

Write the effects of centrifugal force

A car is travelling at 30 km/h in a circle of radius 60m. What is the minimum value of μ_s for the car to make the turn without skidding?

Explain the concept of inertia. Write two examples each for inertia of motion, inertia of rest and inertia of direction

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11th Physics Monthly Test - 3 ( Laws of motion )

MABS Institution

11th Physics Monthly Test - 3 ( Laws of motion )-Aug 2020

Part - A

Generic 2 - Answer All Question

The outer edge of a rotating platform is inclined upwards. Why?

With an example, explain a situation where force and motion are not in the same direction.

Give reason. fs = μs.N

Explain the term "maximal static friction".

The distance travelled by a moving body is directly proportional to time. Is any external force acting on it?

Write the expression for Impulse in terms of average force.

What is the angle between frictional force and instantaneous velocity of a body moving over a rough surface?

A force \(\vec { F } =(6\hat { i } -8\hat { j } +10\hat { k } )\) N produces acceleration of 1 m/s2 in a body. Calculate the mass of the body.

A body is just sliding down an inclined plane due to its own weight. What is the relation between angle of inclination and angle of repose?

What do you mean by Inertia of direction? Given one example.

"Force and motion acts in the same direction". Give example.

Why is it necessary to bend knees while jumping from greater height?

Wheels are made circular. Why?

Part - B

Generic 3 - Answer All Question

State Newton's third law.

A man getting out of a moving bus runs in the same direction for a certain distance. Comment.

In what ways the force changes the velocity of a particle?

A boy throws ball of mass 100 g with a speed of 15 m/s, If the ball hits a wall and rebounds with the half the original speed, what is the change in momentum of the ball?

State the empirical laws of static and kinetic friction

State Newton's second law.

A ball of mass 1kg hangs in equilibrium from two strings OA and OB as shown in the diagram. What are the tensions in strings OA and OB? Take g = 10 ms-2.

A monkey climbs down a rope which can withstand a maximum tension equal to 1 - 2nd the weight of the monkey. Calculate the minimum acceleration with which the monkey should climb down the rope.

A force of 36 dynes is inclined to the horizontal at an angle of 60°. Find the acceleration in a mass of 18 g that moves in a horizontal direction.

Determine the angle of banking so as to minimize the wear and tear of the tyres of a car negotiating a banked curve.

Write the effects of centrifugal force

A car is travelling at 30 km/h in a circle of radius 60m. What is the minimum value of μs for the car to make the turn without skidding?

Explain the concept of inertia. Write two examples each for inertia of motion, inertia of rest and inertia of direction

Comment

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Give reason. f_s = μ_s.N

A force \(\vec { F } =(6\hat { i } -8\hat { j } +10\hat { k } )\) N produces acceleration of 1 m/s² in a body. Calculate the mass of the body.

A ball of mass 1kg hangs in equilibrium from two strings OA and OB as shown in the diagram. What are the tensions in strings OA and OB? Take g = 10 ms^-2.

A monkey climbs down a rope which can withstand a maximum tension equal to 1 - 2^nd the weight of the monkey. Calculate the minimum acceleration with which the monkey should climb down the rope.

A car is travelling at 30 km/h in a circle of radius 60m. What is the minimum value of μ_s for the car to make the turn without skidding?