Question

A horizontal force of 15N is necessary to just hold a block stationary against
a wall. The coefficient of friction between the block and the wall is 0.2. The
weight of the block is

Answer 1

Given

• μ = 0.2
• F = 15 N

To Find

• Weight of the block

Solution

☯ W = μN

• Frictional force = Weight

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✭ According to the Question :

➞ W = μN

• W = Weight = ?
• μ = 0.2
• N = 15 N

➞ W = 0.2 × 15

➞ W = 3 N

∴ The weight of the block is 3 N

Answer 2

Information provided with us:

• A horizontal force of 15N is necessary to just hold a block stationary against a wall
• The coefficient of friction between the block and the wall is 0.2

What we have to calculate:

• Weight of the block on which horizontal force was applied

Using Formula,

• $\boxed{\bf{F = μN}}$

Where,

• F is the force of friction
• μ is the coefficient of friction
• N is the horizontal force

Required calculations:

We have,

• N is 15
• μ is 0.2

Putting the required values,

➺ $\sf{ F = (0.2)(15)}$

➺ $\sf{F = (\dfrac{02}{10}) (15) }$

➺ F = (2/10) (15)

➺ F = (1/5) (15)

➺ F = 1/5 × 15

➺ F = 1 × 3

➺ F = 3

• Henceforth, weight of the block is of 3N

More Information:

• Force is typically defined as the ability to change the shape of an object and acceleration when applied
• Force is a vector quantity
• S.I. unit of force is newton (N)
• When a force is applied on an object it's linear momentum changes $\:$