2070HW_NewtonLaws_Soln (2)

# 2070HW_NewtonLaws_Soln (2) - Physics 2070 Homework 3 1....

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Physics 2070 Homework 3 1. 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. a. The gravitational force The gravitational force is larger on the metal sphere (S) because it has a larger mass. b. The time it will take to fall a given distance in air The feather (F) will take a longer time to fall in air than the metal sphere (S) because the feather will feel a larger air resistance. c. The time it will take to fall a given distance in vacuum Both will take the same amount of time to fall the same distance in a vacuum because the air resistance on the feather no longer has to be taken into account. d. The total force on the object when falling in vacuum The metal sphere (S) will feel a larger total force when falling in a vacuum than the feather (F) because it has a larger mass and therefore feels a larger gravitational force (weight). e. The total force on the object when falling in air. The metal sphere (S) will feel a larger total force when falling in air than the feather because it has a larger mass and so a larger weight, and also because it does not feel as large a resistive force due to the friction with

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## This note was uploaded on 12/21/2011 for the course PHYS 2070 taught by Professor Thompson during the Spring '08 term at Toledo.

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2070HW_NewtonLaws_Soln (2) - Physics 2070 Homework 3 1....

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