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EFFECT OF FORCE ON SHAPE OF AN OBJECT
EFFECT OF FORCE ON SHAPE OF AN OBJECT
Activity 11.5:
* Some situations have been given in Column 1 of Table 11.2 in which objects are not free to move. Column 2 of the Table suggests the manner in which a force can be applied to each object while Column 3 shows a diagram of the action.
* Try to observe the effect of the force in as many situations as possible.
* You can also add similar situations using available material from your environment.
* Note your observations in Columns 4 and 5 of the Table.
Description of the Situation
How to Apply Force
Diagram
Action of Force
Change in State of Motion
Change in Shape
Yes
No
Yes
No
A lump of dough on a plate.
Pressing it down with your hands.
Spring fixed to the seat of a bicycle.
By sitting on the seat.
A rubber band suspended from a hook/nail fixed on a wall.
By hanging weight or by pulling its free end.
A plastic or metal scale is placed between two bricks.
By putting a weight at the center of the scale.
Table 11.2: Studying the Effect of Force on Objects
What do you conclude from the observations noted in Table 11.2? What happens when you apply a force on an inflated balloon by pressing it between your palms? What happens to the shape of a ball of dough when it is rolled to make a chapati? What happens when you press a rubber ball placed on a table? In all these examples you saw that the application of force on an object may change its shape.
Having performed all the above activities, you would have realized that a force
* may make an object move from rest.* may change the speed of an object if it is moving.
* may change the direction of motion of an object.
* may bring about a change in the shape of an object.
* may cause some or all of these effects
While a force may cause one or more of these effects, it is important to remember that none of these actions can take place without the action of a force. Thus, an object cannot move by itself, it cannot change speed by itself, it cannot change direction by itself and its shape cannot change by itself.
Source: This topic is taken from NCERT TEXTBOOK