A satellite is kept in orbit by its speed – it is continually falling, but the Earth ‘curves’ from underneath it.

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Presentation transcript:

A satellite is kept in orbit by its speed – it is continually falling, but the Earth ‘curves’ from underneath it.

Your weight is what you feel Reading on a scale is zero… Weightlessness? What is it? Gravity = zero? Your weight is what you feel ie your support force Reading on a scale is zero…

A man stands on a scale inside a stationary elevator. Forces acting on the man Fs Reading on scale is your weight force mg

When Moving Downward With Constant Acceleration Forces acting on the man a Fs Reading on scale is your weight force mg You Feel some weightlessness?

Freefalling Downward with acceleration due to gravity Forces acting on the man a Reading on scale is your weight force mg You are weightless!

Apparent Weightlessness The figure shows a person on a scale in a freely falling elevator and in a satellite in a circular orbit. In each case, what apparent weight is recorded by the scale? Answer: 0

Weightlessness in Orbit A person feels weightless in orbit simply because he or she is in free fall (doing UCM) along with the satellite and experiences no force of support (Reaction / Normal) from the satellite. The perception of weight comes from the support force exerted upon us by the floor, a chair, etc. If that support force is removed and we are in free fall, we feel no experience of weight. Most Earth satellite orbits are only a few hundred kilometres above the surface, so the actual weight is diminished very little. Ballistic trajectory Demo Hyper Physics http://hyperphysics.phy-astr.gsu.edu/hbase/HFrame.html

The A300 has now been certified for flying parabolas that provides, in addition to microgravity, reduced gravity levels of 0.16g for approximately 23 s... These gravity levels correspond to Lunar and Martian gravity levels. http://ataridogdaze.com/weightless/parabolic-flight.shtml>