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Free Fall: How Fast? Conceptual Physics Text Correlation: Section 2.5, 2.7 2

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Question 1 What will be the speed of a freely- falling object after falling 6 seconds? 7 seconds? 8 seconds? Answer: Each second its speed increases by 10 m/s, so in 6 seconds its speed is 60 m/s; in 7 seconds, 70 m/s; in 8 seconds, 80 m/s. Here of course, we ignore air drag (which depends on the nature of the object).

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Question 2 If we threw an object downward, how would its speed differ? Answer: Speed would be greater by the speed initially given. So whatever speed it begins with, in each second it will increase 10 m/s.

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Question 3 If we threw an object straight upward, how would its speed differ? Answer: Whatever the initial upward speed, in each second on the way up its speed decreases by 10 m/s.

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FALLING OBJECTS pp. 60 - 65 Freely falling bodies undergo constant acceleration. Such motion is referred to as free fall. The free-fall acceleration.

FALLING OBJECTS pp. 60 - 65 Freely falling bodies undergo constant acceleration. Such motion is referred to as free fall. The free-fall acceleration.

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