lecture08

# lecture08 - What third force would make the net force point...

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Physics 131 Spring 2008 Dongping Zhong Lecture 8 (Wednesday, Apr 9) Force and Motion Key concept: Newton’s first and second laws Page 1

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P2 Newtonian Mechanics Force (a push/pull, vector, N or lb, a contact or long-rang force) Mass (intrinsic property) Inertial Reference Frames Newton’s First Law, Weight Newton’s Second Law Newton’s Third Law
P3 Newton’s 1 st law: No net force acts on a body, the body will be in a constant motion and the body cannot accelerate. 0 . 0 = = = a and const V F i i v v v

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Forces are vector quantities. Addition according to the rules of vector algebra. Two forces are exerted on an object.

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Unformatted text preview: What third force would make the net force point to the left? P4 P5 Gravity: mg weight W ground the toward mg F g a a m F g = = = = ) ( ) ( , v v Ex: A 10 kg mass weights 98 N. ∑ = ma F v Newton 2 nd Law: P6 1 2 m 1 =3 kg m 2 =4 kg Forces on each object 1 and 2? Ex: P7 An elevator that has descended from the 50th floor is coming to a halt at the 1st floor. As it does, your apparent weight is 1. More than your true weight. 2. Less than your true weight. 3. Equal to your true weight. 4. Zero....
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lecture08 - What third force would make the net force point...

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