A man is pushing a refrigerator initially at rest up a 20 degree incline. He pushes with a force of 90 N parallel to the incline. The weight of the refrigerator is 80 N. The coefficient of non-sliding and sliding friction is 0.4 and 0.3 respectively. Point A is designated to be the lower right corner of the refrigerator.  For what value of P will the refrigerator start to slide upwards? For what value of P will the refrigerator start to tip forward? What is the state of motion of the refrigerator?

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Forced undamped vibrations

In mechanical engineering, vibration is expressed as the term that occurs due to an object's backward and forward movement about a point of equilibrium. Generally, there are three types of vibrations which are,