Home
Class 11
PHYSICS
Suppose all the surfaces in the previous...

Suppose all the surfaces in the previous problem are rough. The direction of friction on B due to A

A

is upward

B

is downward

C

is zero

D

depends on the masses of A and B

Text Solution

AI Generated Solution

The correct Answer is:
To determine the direction of friction on block B due to block A when all surfaces are rough, we can follow these steps: ### Step-by-Step Solution 1. **Identify the Forces Acting on the Blocks**: - For block A (let's denote its mass as \( M_1 \)), the gravitational force acting downward is \( M_1g \). - For block B (mass \( M_2 \)), the gravitational force acting downward is \( M_2g \). 2. **Understand the Effect of Friction**: - Friction acts to oppose the relative motion between two surfaces in contact. In this case, we need to analyze the interaction between blocks A and B. 3. **Analyze the Motion of Block A**: - Since block A is in contact with a rough surface (the wall), and if it were to slide downward, friction would act to oppose this motion. Therefore, the frictional force on block A due to the wall would act upward. 4. **Determine the Direction of Friction on Block B**: - As block A moves downward, it would exert a frictional force on block B. This frictional force would act in the direction that opposes the motion of block A. - Since block A is moving downward, the frictional force exerted by block A on block B (denoted as \( F_{BA} \)) would act upward on block B. 5. **Conclusion**: - The direction of the frictional force on block B due to block A is upward. This is to counteract the downward gravitational force acting on block B. ### Final Answer: The direction of friction on B due to A is **upward**. ---
Promotional Banner

Topper's Solved these Questions

  • FRICTION

    HC VERMA ENGLISH|Exercise Objective -2|5 Videos

  • FRICTION

    HC VERMA ENGLISH|Exercise Exercises|31 Videos

  • FRICTION

    HC VERMA ENGLISH|Exercise worked out Examples|10 Videos

  • FLUID MECHANICS

    HC VERMA ENGLISH|Exercise All Questions|90 Videos

  • GRAVITATION

    HC VERMA ENGLISH|Exercise Question for short Answers|18 Videos

Similar Questions

Explore conceptually related problems

In the above problem, direction of friction force is

Consider the situation shown in figure. The wall is smooth but the surfces of A and B in contact are rough. The friction on B due to A in equilibrium.

In the previous problem. The friction force applied by ground on block B is

Consider the situation shown in figure. The wall and the surface of A and B in contact are rough. The friction on A due to .

"When a person walks on a rough surface the frictional force exerted by the surface on the person is opposite to the direction of his motion". Is it true or false ?

suppose the ends of the coil in the previous problem are connected to a resistane of 100 Omega . Neglecting the resistance of the coil, find the heat produced in the circuit in one minute.

Suppose the ceiling in the previous problem is that the elevator which is going up with an acceleration of 2.0 m/s^2 . Find the elongations.

When a person walks on a rough surface, the frictional force exerted by surface on the person is opposite to the direction of his motion. It is the force exerted by the road on the person that causes the motion.

Suppose the rod in the previous problem has a mass of 1 kg distributed uniformly over its length. a. find the initial angular acceleration of the rod. b. Find the tension in the supports to the blocks of mass 2 kg and 5kg .

Assertion: When a person walks on a rough surface, the frictional force exerted by the surface on the person is opposite to the direction of tendenc of motion his leg. Reason: If a body moves with constant velocity, then it means that body is moving along straight line & there is no acceleration.