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A girl press her physics text book again...

A girl press her physics text book against a rough vertical wall with her hand. The direction of the frictional force on the book exerted by the wall is

A

downwards

B

upwards

C

out from the wall

D

into the wall

Text Solution

AI Generated Solution

The correct Answer is:
To determine the direction of the frictional force on the book exerted by the wall, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Forces Acting on the Book**: - The book is pressed against a vertical wall, and the forces acting on it include: - The gravitational force (weight) acting downwards due to gravity. - The normal force exerted by the wall acting horizontally towards the book. - The frictional force which opposes the motion of the book. 2. **Understand the Effect of Gravity**: - The weight of the book acts downwards. If the book were not pressed against the wall, it would fall due to this gravitational force. 3. **Role of Friction**: - Friction acts to oppose the relative motion between two surfaces in contact. In this case, the book is trying to slide down the wall due to gravity. 4. **Direction of Frictional Force**: - Since the book is attempting to slide down, the frictional force must act in the opposite direction to prevent this downward motion. Therefore, the frictional force must act upwards. 5. **Conclusion**: - The direction of the frictional force on the book exerted by the wall is upward. ### Final Answer: The direction of the frictional force on the book exerted by the wall is **upward**. ---
To determine the direction of the frictional force on the book exerted by the wall, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Forces Acting on the Book**: - The book is pressed against a vertical wall, and the forces acting on it include: - The gravitational force (weight) acting downwards due to gravity. - The normal force exerted by the wall acting horizontally towards the book. ...
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A block of mass M is held against a rough vertical wall by pressing it with a finger . If the coefficient of friction between the block and the wall is mu and the acceleration due to gravity is g , calculate the minimum force required to be applied by the finger to hold the block against the wall.

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Knowledge Check

  • A block of mass M is held against a rough vertical wall by pressing it with a finger . If the coefficient of friction between the block and the wall is mu and the acceleration due to gravity is g , calculate the minimum force required to be applied by the finger to hold the block against the wall.

    A
    `muMg`
    B
    Mg
    C
    `(Mg)/(mu)`
    D
    `2muMg`

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