Hook's Law or Mass Spring System || Entry test preparation || Main points

For entry test preparation main Points are given below

Hook’s Law or Mass Spring System:

 It states that with in elastic limit the elastic restoring force is directly proportional to

displacement.

 When an elastic spring is stretched by a force, the force exerted the spring is directly

proportional to the displacement. This is known as Hook’s law.

 F - x

F = - K x .

 K is spring constant or Hook’s constant.

 Elastic Restoring Force:

 He stated that within elastic limit the elastic restoring force is directly proportional to the

displacement.

 F -x

 F = -Kx

 S.I unit is N/m.

 The negative sign shows that the applied force is always opposite to the spring force or

elastic restoring force.

Main Points of Hook’s Law

 By spring force Net work done is zero.

 Velocity is maximum at mean position.

 Velocity is zero at extreme position.

 Acceleration is zero at mean position.

 Acceleration is maximum at extreme position.

 When displacement is zero then acceleration is zero because a x acceleration is directly

proportional to the displacement.

 When acceleration is positive +ve then displacement is negative –ve.

 When acceleration of S.H.M is maximum, velocity is minimum.

For Understanding conceptually watch this video

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