Question

answer these questions please it's urgent ​

Answer 1

13...

A non-contact force is a force which acts on an object without coming physically in contact with it. ... In contrast a contact force is a force applied to a body by another body that is in contact with it.

14...

Pressure—the effect of a force applied to a surface—is a derived unit, obtained from combining base units. The unit of pressure in the SI system is the pascal (Pa), defined as a force of one Newton per square meter. The conversion between atm, Pa, and torr is as follows: 1 atm = 101325 Pa = 760 torr.

15... (a)

We can't feel the atmospheric pressure because our body is full of air also . The pressure inside lungs,blood vessels and several organs have the same pressure from inside as the atmospheric pressure is applied on our body from outside.

(b)

The pressure exerted by water in the oceans increases with depth. Very deep down, the pressure is enough to crush the human body. That is why deep sea divers wear special suits which can withstand such high pressure and prevent their bodies to crush.

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Answer 2

• Pressure is usually defined as the amount of force that is applied to a certain area.
• The SI unit of pressure is Pascal (represented as Pa)

Pascal formula :

• $Pa \: = \frac{N}{ {m}^{2} } = \frac{kg}{m \times {s}^{2} }$

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