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Two equal forces acting on a body in different directions have their resultant equal to the magnitude of one of the force. Find the angle between them?
  • a)
    θ = 120°
  • b)
    θ = 180°
  • c)
    θ = 0°
  • d)
    θ = 160°
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Two equal forces acting on a body in different directions have their r...
Concept:
  • Vector quantities are those physical quantities that have both magnitude and direction and obey the vector law of addition.
    • Example Displacement, Velocity, Force, Momentum, etc
The magnitude of resultant of two vectors is given by:

Where A and B are the magnitudes of two vectors and θ is the angle between them
Calculation:
Let's assume two forces A and B having two equal force have their resultant equal to either.
A = B = R
cosθ = -1/2,  Since (cos -1/2 = 120° )
The angle between them is, θ = 120° 
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Two equal forces acting on a body in different directions have their resultant equal to the magnitude of one of the force. Find the angle between them?a)θ = 120°b)θ = 180°c)θ = 0°d)θ = 160°Correct answer is option 'A'. Can you explain this answer?
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