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Consider a metal sphere two inches in diameter (S) and a feather (F). For each quantity in the list below indicate the relation between the quantity for S and F. Is it the same, greater, or lesser? Explain in each case why you gave the answer you did.

1. The gravitational force
2. The time it will take to fall a given distance in air
3. The time it will take to fall a given distance in vacuum
4. The total force on the object when falling in vacuum
5. The total force on the object when falling in air.

Note to the instructor: Students often confuse the gravitational force with the gravitational acceleration of an object in free fall (the gravitational field strength). This problem could lead to a useful class discussion.

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Page last modified October 15, 2002: D23