Question

How can you derive the first law of motion from Newton's second law of motion?

Answer 1

Answer:

Newton's first law can be derived from Newton's second law when there is no force (the force is 0). Nevertheless, Newton's first and second laws are considered independently. According to Newton's third law, every action has an equal and opposite reaction.

Answer 2

Answer:

Newton's 2nd law of motion:

the body mass=m

initial velocity=u

accelerates uniformly with acceleration"a".

for time "t" then changes to final velocity"v".

Then,

initial momentum P1=mu

final momentum P2=mv

change in momentum (delta)P=P2-P1

=mv-mu

=m(v-u)

according to 2nd law,

F proportional to

change in momentum÷time

F proportional to. P2÷P1

F proportional to. m(v-u)÷t. [a=v-u÷t]

F proportional to. ma

F =kma. (k=constant proportional)

acceleration 1m/s^2. on 1kg mass

so

f=k(1)(1)

if we have taken k=1

then,

f=kma changes to f=ma

SI unit of force is Newton

1 Newton =1kg m/s^2

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