question_answer

Vishnu and Mahesh are pushing a heavy box placed on a floor, as shown in the given figure. The arrow over the box shows the direction of motion of the box. Vishnu is applying a force of magnitude \[{{F}_{v}}\] and Mahesh is applying a force of magnitude \[{{F}_{m}}\]. Which of the following pairs of forces have the same direction?

A)   \[{{F}_{v}}\]and frictional force

B)   \[{{F}_{m}}\]and frictional force

C)  \[{{F}_{v}}\]and gravitational force

D)  \[{{F}_{m}}\] and gravitational force

Correct Answer: B

Solution :

  The force of friction always opposes motion. The box is moving rightward. Hence, the force of friction between the box and the floor is acting leftward. Since Mahesh is applying a force of magnitude\[{{F}_{m}}\]leftward,\[{{F}_{m}}\]and frictional force have the same direction, i.e., leftward, as shown in the following figure. The correct answer is B