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Orbital Motion — Quiz Answers

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1
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How can Brendan correct his diagram?

A
Change the cap f sub g is equal to cap f sub c vector label so it reads cap f sub A is equal to cap f sub c .
B
Draw the cap f sub g is equal to cap f sub c vector so it is longer than the v vector.
C
Draw the cap f sub g is equal to cap f sub c vector so it points at a 45 degrees angle from the v vector.
D
Change the cap f sub g is equal to cap f sub c vector so it is perpendicular to the v vector.
2
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Why are satellites placed into orbit at least 150 kilometers above Earth’s surface?

A
to avoid air resistance
B
to match Earth’s curvature
C
to create inertia
D
to increase friction
3

Which best explains why astronauts appear weightless when they are in a space shuttle orbiting Earth?

A
They are falling toward Earth at a faster rate than the space shuttle.
B
They are too far from Earth to experience gravity.
C
They are too far from Earth to experience air resistance.
D
They are falling toward Earth at the same rate as the space shuttle.
4

Which object would be considered to be in free fall?

A
one with only gravity acting upon it
B
one that experiences both friction and centripetal force
C
one that is slowed down by air resistance
D
one that is truly weightless
9

Which best describes Sid’s error?

A
Centripetal force is perpendicular to the velocity of the satellite.
B
Tangential speed changes throughout a satellite’s orbit.
C
Tangential speed increases with a satellite’s increasing distance from Earth.
D
Centripetal force can sometimes slow down a satellite in orbit.

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