Question

Resultant of two equal forces each of magnitude F is also F.What is the angle between the two?

Answer 1

Answer:

120°

Explanation:

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Answer 2

Answer:

Force is vector quantity . Resultant of two vectors A and B is given by

R = √{A² + B² + 2A.BcosФ} , where Ф is angle between A and B

Now, magnitude of each force is F and resutant is also F

Then, F = √{F² + F² + 2.F.FcosФ}

⇒F² = F² + F² + 2F².cosФ

⇒- F² = 2F²cosФ

⇒ -1/2 = cosФ

⇒cosФ = -1/2 = cos120°

⇒Ф = 120°

Hence angle between them is 120°

Explanation:

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