Lecture03

Lecture03 - Click to edit Master subtitle style PHYS 2101,...

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Unformatted text preview: Click to edit Master subtitle style PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 Chapter 5 Force and Motion 11 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 5.2. Newtonian Mechanics Newtonian Mechanics: Study of relation between force and acceleration of a body: Newtonian Mechanics does not work well when: 1. Speed is very high (close to light speed) 2. Scales are very small (atomic) 22 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 5.3. Newton’s First Law Newton’s First Law: If no force acts on a body, the body’s velocity cannot change; that is, the body cannot accelerate. If the body is at rest, it stays at rest. If it is moving, it continues to move with the same velocity (same magnitude and same direction). 33 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 5.4. Force 1) A force is measured by the acceleration it produces. 2) Forces have both magnitudes and directions (it is a vector). 3) When two or more forces act on a body, we can find their net, or resultant force, by adding the individual forces as vectors. Newton’s First Law: If no net force acts on a body , the body’s velocity cannot change; that is, the body cannot accelerate 44 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 4) The net force acting on a body is represented with the vector symbol Fnet PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 5.4. Force Unit of the force: The force that is applied on a standard mass of 1 kg to produce an acceleration of 1 m/s2 has a magnitude of 1 Newton (abbreviated N ) 55 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 Inertial Reference Frames An inertial reference frame is one in which Newton’s laws hold. If a puck is sent sliding along a short strip of frictionless ice—the puck’s motion obeys Newton’s laws as observed from the Earth’s surface. If the puck is sent sliding along a long ice strip extending from the north pole, and if it is viewed from a point on the Earth’s surface, the puck’s path is not a simple straight line. The apparent deflection is not caused by a force, but by the fact that we see the puck from a rotating frame. In this situation, the ground is a non-inertial frame. 66 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 5.5. Mass The ratio of the masses of two bodies is equal to the inverse of the ratio of their accelerations when the same force is applied to both. Mass is an intrinsic characteristic of a body The mass of a body is the characteristic that relates a force on the body to the resulting acceleration....
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This note was uploaded on 09/30/2010 for the course PHYS 2101 taught by Professor Grouptest during the Spring '07 term at LSU.

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Lecture03 - Click to edit Master subtitle style PHYS 2101,...

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