Q5 of 8 Page 11

What do you know by the state of motion?

The state of motion of an object is described by its speed and the direction of motion. The state of rest is considered to be the state of zero speed. An object may be at rest or in motion; both are its state of motion. Any change in the speed, or direction of motion, or both, implies a change in the state of motion of the object.

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3 Name some non-contact forces. 4 How does an applied force changes the speed of an object?  6 We know that there is a huge amount of atmospheric pressure on us. But we do not experience its effect why? 7 We know that a force applied on an object causes either a change in its state of motion or its shape. Different types of events are listed is the following table. Tell the type of effect in each case.

Description of SituationHow to apply ForceAction of force
Change in state of motionChange in shape
Yes No Yes No
A lump of dough on a plate Pressing it down with hand    
A foam cushion placed on a chair or a bed Pressing with a hand or standing on it.     
A rubber ball placed on a table Pressing it down with hand    
A ball of cotton or a piece of sponge placed on a table By keeping a book or a weight over it    
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 a weight or by pulling its free end     
A plastic or metal scale placed between two bricks By putting a weight at the centre of the scale