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Vertical 1D Motion Problem

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On the Moon A Moon rock ON THE MOON is thrown upward with velocity of 7 m/s. After 7 s, it has a downward velocity of 4 m/s. What is the acceleration due to gravity on the Moon? How high above the starting point did the rock go before it began to fall?

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On the Moon A Moon rock is thrown upward with velocity of 7 m/s. After 7 s, it has a downward velocity of 4 m/s. What is the acceleration due to gravity on the Moon? How high above the starting point did the rock go before it began to fall?

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Given Information v o = + 7 m/s ( or upwards ) v f = -4 m/s ( or downwards ) Time interval of 7 sec ( t = 7 s )

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Part A - Choose Appropriate Formula

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Part A - Choose Appropriate Formula

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Part A - Choose Appropriate Formula

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Part A – Substitute Values

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Part A – Substitute Values

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Part B – Appropriate Formula NOW HAVE ADDITIONAL INFO ( value for g ) What are you asked to find? – Height of rock ( above initial position ) before rock falls Any more info from this?

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Part B – Appropriate Formula NOW HAVE ADDITIONAL INFO ( value for g ) What are you asked to find? – Height of rock ( above initial position ) before rock falls Any more info from this? – Final velocity at top of path is zero

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Part B – Appropriate Formula

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Part B – Substitute Values

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Part B – Solve

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Part B – Solve This value should actually be 1.57 m/s 2 since you do not want to round—IN ANY PROBLEM, EVEN IF YOU ARE USING THE ANSWER FROM A PREVIOUS ONE— UNTIL THE VERY END

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Part B – Without Sig Figs?

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Exam Prep Book Pg 24 ( 1 -5 ) Pg 25 – 1 ( graph ) Pg 30 ( #1 ) Pg 31 ( 2-5 & 1-2 at bottom )

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