Question

A force is applied on a body to move it
on a rough horizontal surface. The
body just starts moving when force
applied is 800 N. The net force acting
on the body, when external applied
force is 450 N, is​

Answer 1

Answer:

NET FORCE = APPLIED FORCE - EXTERNAL APPLIED

FORCE

= 800N - 450N

= 350N

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Answer 2

Answer:

0 N

As body starts moving when external force = 800N

limiting frictional force = 800N

Now,

if a force of 450N is applied, 450N of frictional force will also act on it in opposite direction and the object will remain stationary.

Net ext. force = sum of all ext force acting on it

= F (applied) + Frictional force

= 450N - 450N

= 0 N

this can further be verified as the body is stationary, Fext. will be 0.

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