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A body is moving with uniform velocity of 2 m/s on a rough level surface. The frictional force on it is 10 N. If the body moves with velocity 4 m/s, the force of friction will be 
  • a)
    2.5 N  
  • b)
    5 N 
  • c)
    10 N  
  • d)
    20 N
Correct answer is option 'C'. Can you explain this answer?
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A body is moving with uniform velocity of 2 m/s on a rough level surfa...
Kinetic friction is constant, hence frictional force will remain same (= 10 N). 
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A body is moving with uniform velocity of 2 m/s on a rough level surfa...
Frictional Force on a Body Moving with Uniform Velocity

- When a body is moving with a uniform velocity on a rough level surface, the frictional force acting on it is equal to the product of the coefficient of friction (μ) and the normal force (N).

Frictional Force = μN

- In this case, the velocity of the body is given as 2 m/s and the frictional force is given as 10 N. We need to find the frictional force when the velocity of the body is 4 m/s.

Using the formula for frictional force, we have:

10 N = μN (equation 1)

- Now, let's consider the situation when the body moves with a velocity of 4 m/s. Since the velocity has increased, the frictional force will also increase.

- The normal force acting on the body remains the same, as the body is still on the same rough level surface. Therefore, the normal force can be considered constant.

- Let's assume the new frictional force is F (to be determined).

Using the formula for frictional force, we have:

F = μN (equation 2)

- We can compare equations 1 and 2 to find the relationship between the frictional force and the velocity of the body.

Since the normal force is constant, we can cancel it out from both equations:

10 N = μN
F = μN

- Now, let's compare the velocities:

2 m/s ≠ 4 m/s

- From this comparison, we can conclude that the frictional force is not directly proportional to the velocity of the body.

- Therefore, we cannot directly use the given frictional force of 10 N to find the frictional force when the velocity is 4 m/s.

- Hence, without any additional information or assumptions about the coefficient of friction, we cannot determine the exact value of the frictional force when the velocity of the body is 4 m/s.

- Therefore, the correct answer cannot be determined and none of the given options (a, b, c, d) are correct.
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Attempt All sub parts from each question.Damping: When an analog instrument is used to measure a physical parameter, a deflecting torque is applied to the moving system which is deflected from its initial position and should move steadily to the deflected position. But due to inertia, the moving system keeps on oscillating about equilibrium. To remove the oscillation of the moving system a damping torque is required. The damping torque should be of such that the pointer quickly comes to its final steady position, without overshooting. If the instrument is underdamped, the moving system will oscillate about the final steady position with a decreasing amplitude and will take some time before it comes to rest. When the moving system moves rapidly but smoothly to its final steady position, the instrument is said to be critically damped or deadbeat. If the damping torque is more than what is required for critical damping, the instrument is said to be overdamped. In an overdamped instrument, the moving system moves slowly to its final steady position in a lethargic fashion.Methods of producing damping torque:(i) Air friction damping(ii) Fluid friction damping(iii) Eddy current dampingAir Friction Damping: A light piston is attached to the moving system. This piston moves in an air chamber closed at one end. When there is an oscillation, the piston moves in and out of the chamber. When the piston moves into the chamber, the air inside is compressed and an air pressure is built up which opposes the motion of the piston and thus the moving system faces a damping torque which ultimately reduces the oscillation. Fluid Friction Damping: In this type of damping oil is used in place of air. Viscosity of the oil being greater, the damping torque is also more. A disc is attached to the moving system which is completely dipped into the oil. When the moving system oscillates, the disc moves in oil and a frictional drag is produced. This frictional drag opposes the oscillation. Eddy Current Damping: The moving system is connected to an aluminium disc which rotates in a magnetic field. Rotation in magnetic field induces an emf in it and if the path is closed, a current (known as eddy current) flows. This current interacts with the magnetic field to produce an electromagnetic torque which opposes the motion. This torque is proportional to the oscillation of the moving system. This electromagnetic torque ultimately reduces the oscillation. Air friction damping provides a very simple and cheap method of damping. The disadvantages of fluid friction damping are that it can be used only for instruments which are in vertical position. Eddy current damping is the most efficient form of damping.Q. The most efficient form of damping is

Attempt All sub parts from each question.Damping: When an analog instrument is used to measure a physical parameter, a deflecting torque is applied to the moving system which is deflected from its initial position and should move steadily to the deflected position. But due to inertia, the moving system keeps on oscillating about equilibrium. To remove the oscillation of the moving system a damping torque is required. The damping torque should be of such that the pointer quickly comes to its final steady position, without overshooting. If the instrument is underdamped, the moving system will oscillate about the final steady position with a decreasing amplitude and will take some time before it comes to rest. When the moving system moves rapidly but smoothly to its final steady position, the instrument is said to be critically damped or deadbeat. If the damping torque is more than what is required for critical damping, the instrument is said to be overdamped. In an overdamped instrument, the moving system moves slowly to its final steady position in a lethargic fashion.Methods of producing damping torque:(i) Air friction damping(ii) Fluid friction damping(iii) Eddy current dampingAir Friction Damping: A light piston is attached to the moving system. This piston moves in an air chamber closed at one end. When there is an oscillation, the piston moves in and out of the chamber. When the piston moves into the chamber, the air inside is compressed and an air pressure is built up which opposes the motion of the piston and thus the moving system faces a damping torque which ultimately reduces the oscillation. Fluid Friction Damping: In this type of damping oil is used in place of air. Viscosity of the oil being greater, the damping torque is also more. A disc is attached to the moving system which is completely dipped into the oil. When the moving system oscillates, the disc moves in oil and a frictional drag is produced. This frictional drag opposes the oscillation. Eddy Current Damping: The moving system is connected to an aluminium disc which rotates in a magnetic field. Rotation in magnetic field induces an emf in it and if the path is closed, a current (known as eddy current) flows. This current interacts with the magnetic field to produce an electromagnetic torque which opposes the motion. This torque is proportional to the oscillation of the moving system. This electromagnetic torque ultimately reduces the oscillation. Air friction damping provides a very simple and cheap method of damping. The disadvantages of fluid friction damping are that it can be used only for instruments which are in vertical position. Eddy current damping is the most efficient form of damping.Q. In Fluid Friction Damping the amount of damping torque

Attempt All sub parts from each question.Damping: When an analog instrument is used to measure a physical parameter, a deflecting torque is applied to the moving system which is deflected from its initial position and should move steadily to the deflected position. But due to inertia, the moving system keeps on oscillating about equilibrium. To remove the oscillation of the moving system a damping torque is required. The damping torque should be of such that the pointer quickly comes to its final steady position, without overshooting. If the instrument is underdamped, the moving system will oscillate about the final steady position with a decreasing amplitude and will take some time before it comes to rest. When the moving system moves rapidly but smoothly to its final steady position, the instrument is said to be critically damped or deadbeat. If the damping torque is more than what is required for critical damping, the instrument is said to be overdamped. In an overdamped instrument, the moving system moves slowly to its final steady position in a lethargic fashion.Methods of producing damping torque:(i) Air friction damping(ii) Fluid friction damping(iii) Eddy current dampingAir Friction Damping: A light piston is attached to the moving system. This piston moves in an air chamber closed at one end. When there is an oscillation, the piston moves in and out of the chamber. When the piston moves into the chamber, the air inside is compressed and an air pressure is built up which opposes the motion of the piston and thus the moving system faces a damping torque which ultimately reduces the oscillation. Fluid Friction Damping: In this type of damping oil is used in place of air. Viscosity of the oil being greater, the damping torque is also more. A disc is attached to the moving system which is completely dipped into the oil. When the moving system oscillates, the disc moves in oil and a frictional drag is produced. This frictional drag opposes the oscillation. Eddy Current Damping: The moving system is connected to an aluminium disc which rotates in a magnetic field. Rotation in magnetic field induces an emf in it and if the path is closed, a current (known as eddy current) flows. This current interacts with the magnetic field to produce an electromagnetic torque which opposes the motion. This torque is proportional to the oscillation of the moving system. This electromagnetic torque ultimately reduces the oscillation. Air friction damping provides a very simple and cheap method of damping. The disadvantages of fluid friction damping are that it can be used only for instruments which are in vertical position. Eddy current damping is the most efficient form of damping.Q. Damping is required to be provided to the moving part of measuring instrument

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A body is moving with uniform velocity of 2 m/s on a rough level surface. The frictional force on it is10 N. If the body moves with velocity 4 m/s, the force of friction will bea)2.5 N b)5 Nc)10 N d)20 NCorrect answer is option 'C'. Can you explain this answer?
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A body is moving with uniform velocity of 2 m/s on a rough level surface. The frictional force on it is10 N. If the body moves with velocity 4 m/s, the force of friction will bea)2.5 N b)5 Nc)10 N d)20 NCorrect answer is option 'C'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about A body is moving with uniform velocity of 2 m/s on a rough level surface. The frictional force on it is10 N. If the body moves with velocity 4 m/s, the force of friction will bea)2.5 N b)5 Nc)10 N d)20 NCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A body is moving with uniform velocity of 2 m/s on a rough level surface. The frictional force on it is10 N. If the body moves with velocity 4 m/s, the force of friction will bea)2.5 N b)5 Nc)10 N d)20 NCorrect answer is option 'C'. Can you explain this answer?.
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