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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Physics => Topic started by: naved_s9994 on May 12, 2009, 10:02:41 pm

Title: Apparent Weight and weightlessness
Post by: naved_s9994 on May 12, 2009, 10:02:41 pm

Apparent Weight?

Apparent Weightlessness?

True Weightlessness?

Easy concept, but can anyone clarify all the definitions...with an example for each perhaps? (If possible)

Thanks VN,
Thanks !

Title: Re: Apparent Weight and weightlessness
Post by: Mao on May 13, 2009, 08:52:20 am

Apparent Weight is the normal force you feel. Apparent weight can vary depending on whether the frame of reference is accelerating or not. E.g. Sitting on a chair: apparent weight is mg, accelerating up in a lift: apparent weight is m(g+a)

Apparent Weightlessness is when there is no normal force acting on you. This can include rollercoasters that accelerate down at g, hence no net normal force acting, or in orbit around Earth.

True Weightlessness is when there is no force acting on you. That can only be achieved in space away from planets/stars. (and from the definition of gravity, it can never be achieved)