Question

We know that forces arise due to some mutual interaction between two entities

and their interaction efforts can come into play through a” direct contact” or even

without a “direct contact”. A special type of a “direct contact” force has the

general effort of slowing down moving objects. Nature has taken special care to

minimize the slowing down effect of this force on birds and fishes who have to

move through fluids a lot. Humans have also natural observations to design their

special purpose “fast moving object”Like the racing cars. Such objects are given

special shapes.(a)Give any two examples of “contact force”(b) “Magnetic force is a

non-contact force”.True or False.(c) How has nature tried to minimize the slowing

effect of the special force that tends to slow down birds when they move through

air or fish when they move through water?(d) Will one really need special vehicles

if they were to race through vacuum or free space? ​

Answer 1

Answer:

(a) tension & friction

(b) false

(c) Anything that moves through air reacts to aerodynamics. ... The four forces of flight are lift, weight, thrust and drag. ... Drag is a force that tries to slow something down.

(d)yes , they need special vehicles

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Answer 2

Answer:

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