# l10p - Today Announcements The average on the first exam...

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ISP209s7 Lecture 10 -1- Today • Announcements: – The average on the first exam was 31/40 – Exam extra credit is due by 8:00 am Wednesday February 13th. – The second homework extra credit is due by Wednesday February 13th. • F=ma • Electric Force • Work, Energy and Power ISP209s7 Lecture 10 -2- Newton’s Second Law of Force F=ma • Force is equal to mass times acceleration. • For a given force, the amount of acceleration is inversely proportional to the mass. • Force causes acceleration. • If you observe acceleration, there must be a force acting. An equation is worth greater than half the words of a picture. ISP209s7 Lecture 10 -3- A new Force! • Charge is a property of matter. It is measured in Coulombs C. • Like charges repel, unlike charges attract. • Coulomb’s Law of Electric Force 2 2 2 2 1 9 99 . 8 12 C m N E k r Q kQ F = = - + r 12 ISP209s7 Lecture 10 -4- Why? • Coulomb’s law looks like Newton’s Law of

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l10p - Today Announcements The average on the first exam...

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