Question

An object has one force acting on it. It is a 33-newton force pointing downward. To create a net force of zero on the object, which force must be applied to it?

Answer 1

Answer:

force is a vector quantity. let Fr be net force

so, Fr=√(f1²+f2²+2f1f2 cos ∆)

here,∆ be the angle ( I can't type theta)

from given, Fr =0, f1= 33N , f2=?

if Fr is 0

i.e the two vectors are acting antiparallel to eachother.

i.e both have same magnitude but opposite in direction. therefore, ∆ is 180

cos(180)= -1

Fr=f1+f2+2f1f2 (-1)

0= f1+ f2 -2f1f2 ====(f1-f2)²

f1-f2=0

33 -f2 =0

therefore, f2=-33N