8th Class Science Force and Pressure Introduction

       Introduction

When a boatman rows the boat in the river, he has to apply force to push the boat in the forward direction. Or, if a person pulls a box from one place to another he is applying force. A women cutting grass in the field and binding it with the rope; here also she is applying the force. For any type of work , force has to be applied. In thischapter, we will discuss the various kinds of force and its applications. The force can be defined as the push or pull of an object.  It is also the influence, which can change the state of an object.

       In a tug of war, when two teams pull the rope, a stage comes when the rope does not move to either side at all. What can you say about the magnitude of force being applied to the rope by the two teams at that stage?                                                    

(a) Equal

(b) Greater on first side            

(c) Greater on second side

(d) All of these          

(e) None of these                                                

Answer: (a)

Explanation

If there is no movement on either side, the force applied form both side is equal in magnitude.

        It the two forces of equal magnitude are acting on an object in opposite directions, the net force acting on the object is equivalent to the _________.

(a) Unity

(b) Zero

(c) Infinity

(d) All of these

(e) None of these

Answer: (a)

Explanation

If the two forces of equal magnitude are acting on the object then the net force on the object is zero..