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lecture7_post

# lecture7_post - Phy 2053 Announcements Prof Hirschfeld...

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Phy 2053 Announcements 1. Prof Hirschfeld needs to cancel office hours Thurs Jan 28, Tues, Feb. 2 and Thurs. Feb. 4. 2. Access to homework solutions on HW web page Username: phy2053 (all lower case) Password: phy2053

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Newton’s Second Law The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. or m m F a F a Newton’s Third Law If object 1 and object 2 interact, the force exerted by object 1 on object 2 is equal in magnitude but opposite in direction to the force exerted by object 2 on object 1. – Equivalent to saying a single isolated force cannot exist 12 21   F F
Applications of Newton’s Laws Assumptions for now (will change in later chapters) Objects behave as particles Will ignore rotational motion Masses of strings, ropes, and pulleys are negligible and can be ignored when solving problems

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Two blocks each of mass 3.5 kg are fastened to the top of an elevator. (a) If the elevator accelerates upward at 1.6 m/s 2 , find the

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