An office door is given a sharp push and swings open against a pneumatic device that slows the door down and then reverses its motion. At the moment the door is open the widest, (i) does the doorknob have a centripetal acceleration? (ii) Does it have a tangential acceleration?         (a) (i) No (ii) No         (b) (i) No (ii) Yes         (c) (i) Yes (ii) No         (d) (i) Yes (ii) Yes

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Centripetal Force

A particle, body, object or certain mass while travelling in a rotational path or semicircular path, experiences an inertia force. If that inertia force pulls the towards the inward of the imaginary circle in the rotation, it is termed as centripetal force.