Give reasons for the following statements.
1. It is the easiest to open a closed door by applying force at the edge of the door.
2. A coolie places a cloth pad on his head when carrying heavy loads.
3. Deep sea divers wear specially designed suits before diving into the sea.
4. A balloon grows in size when air is blown in it.
5. A sledge is used in snow covered areas.
6. A lizard is able to walk on walls easily.
Answers
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1. It is the easiest to open a closed door by applying force at the edge of the door.
If we open or shut a door, we need to apply less force at the free end because according to the formula of moment of force M = Force × Perpendicular distance of force from axis of rotation Magnitude of force is inversely proportional to the perpendicular distance of force from axis of rotation. Thus, as the distance between the point of force application and hinge will increase, the amount of force required to open the door will decrease.Read more on Sarthaks.com -
2. A coolie places a cloth pad on his head when carrying heavy loads.
Coolie or porter place a round piece of cloth on their heads, when they have to carry heavy loads. By doing this they increase the area of contact of the load with their head. So, the pressure on their head is reduced and they find it easier to carry the load.
3. Deep sea divers wear specially designed suits before diving into the sea.
At deep waters, the column of water above the diver exerts a pressure. The pressure is very high due to the weight of water above the diver upto the surface. The diving suits are required to enable diver with stand these pressures and swim comfortably.
Hence, Deep sea divers wear specially designed suits to protect themselves from high pressures .
4. A balloon grows in size when air is blown in it.
When air is blown into the balloon air molecule exerts pressure on the walls of the balloon causing it to inflate and also air occupies space. Together both the fact leads to balloon grow in size. Ballon grow bigger in size because air has the freely suspended molecules which makes ballon bigger.
5. A sledge is used in snow covered areas.
Because the area of contact is higher in the case of sledge but lower in the case vehicles with wheels. As the area of contact is higher in the case of sledge so the pressure is low. That's why sledge is used in snow covered area
6. A lizard is able to walk on walls easily.
Lizards have a large number of very tiny hairs on the pads of their feet called setae. Lizards employ a rotating motion to attach and detach their feet from the surface, as simply placing their feet on the surface will not generate the required force. Instead, they need to slide their feet into position
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