Unit Test — Unit test Answers

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The gravitational force between two objects is 2000 N. The mass of each object is reduced to one-third of its original mass.

The distance must be one-ninth the original distance.

The distance must be one-third the original distance.

The distance must be three times greater.

The distance must be nine times greater.

Suchita makes a table to identify the variables used in the equations for centripetal force.

X: tangential speedY: radius

X: radiusY: tangential speed

X: centripetal forceY: mass

X: massY: centripetal force

A child on a spinning playground ride is 0.36 m from the center of the ride. The centripetal force on the child is 19 N.

3.7 kg

13 kg

23 kg

79 kg

Which object would be considered to be in free fall?

one that experiences both friction and centripetal force

one that is truly weightless

one that is slowed down by air resistance

one with only gravity acting upon it

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