Which of the following quantities are always negative in a simple harmonic motion?




For the motion to be simple Harmonic, Force must be linearly proportional to the displacement.


F =-kx




(a). = Cosθ


Direction of Force and acceleration is always same. Therefore, it will always be positive.


(b).


Direction of Velocity and displacement is always same; thus it is also coming positive.


(c).


Force is opposite to displacement.


Dot product will become negative as for >90° ,is negative


So, this expression is negative


Again,


(d)


Force is opposite to displacement so it will also be negative.


Therefore, Option (c). and (d) are correct.

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