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Acceleration Of Block On Horizontal Smooth Surface - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main

Quick Facts

  • 4 Questions around this concept.

Solve by difficulty

A force of 50N acts in the direction as shown in fig. The block of mass of 5kg resting on a smooth horizontal surface . What is the acceleration of the block?

A block of mass 5 Kg is at rest on a horizontal smooth surface . A constant force  F = 10 N applied horizontally on the block then the displacement of block after 2 sec will be 

Concepts Covered - 1

Acceleration of Block on horizontal smooth surface
  • Free Body Diagram (FBD)

In this diagram, the object of interest is isolated from its surroundings and the interactions between the object and the surroundings are represented in terms of forces.

After drawing FBD, Choose the axes and write the equation of motion. This is very helpful while solving questions.

Example- 

  1. When the pull is horizontal, and no friction

                   

Balance forces

the body is moving along the $x$-axis

$
\begin{aligned}
& \because F_y=0 \\
& R=m g \quad \& \quad F=m a \\
& a=\frac{F}{m}
\end{aligned}
$
 


 

  1. Pull Acting at Angle (Upward)

                    

Balancing forces in both X and Y directions,

$
\begin{aligned}
& R+F \sin \theta=m g \\
& R=m g-F \sin \theta \text { along } \mathrm{Y} \text {-axis } \\
& F \cos \theta=m a \text { along } \mathrm{X} \text {-axis } \\
& a=\frac{F \cos \theta}{m}
\end{aligned}
$
 

  1. Push Acting at Angle (Downward)

                    

Balancing forces in both X and Y directions, $R=m g+F \sin \theta$ along Y -axis $a=\frac{F \cos \theta}{m}$ along X -axis

 

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Acceleration of Block on horizontal smooth surface

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