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PHYSICS 1L03 (115)
Reza Nejat (43)
Lecture

# set5-Key.pdf

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School
Department
Physics
Course
PHYSICS 1L03
Professor
Reza Nejat
Semester
Fall

Description
Phys 1L03 Tutorial session Set 5 Fifth series: Questions on Newton’s LawSolution 1. sa  5/ 2 F  a () a .4 N g 2. F net ma Fnet  F  F net  Fi ma F  f  ma  F  162N 3. Draw Free Body diagram Fnet ma w  m g F  Tw  ma net T N2.27 10 4 4. Draw Free Body diagram F  ma net FFx  co s 30 25 cos 30 21.65  FFy  sin 30 25 sin 30 N12.5 2 F x ma s x a x 0.72 /  F y 0  Fy N  F ymg  0 N  281.5 5. First, draw Free-Body Diagram  F net ma F  30 N   37 F  F cos 37 23.96 x F y F sin 37 18.0 F x ma x 2 s ax 0.96 /  F y 0  F y N  F  yg  0 N N 263 6. Draw Free Body Diagram, First: F  N  mg cos  0  N  mgcos  y F  m g sin  ma  a  gsin  x 1 a  9.8sin30  4.9 m/s 2 2 v v0at 0 (4.9 m/s )(0.9s)4.41 m/s 7. Draw Free Body Diagram for each block: The pulley is frictionless (ideal), so does not have any effect, expect transferring tension. Two blocks are moving with the same acceleration, but in opposite direction T  m1g  m1a m g  T  m a  2 2 Adding these two:  (m  m ) g  (m  m ) a 2 1 1 2 (m2  m1) a g m 1 m 2) sa 2.3 / 2 T  m 1  m 1 T  315 Or: m g  T  m a Tmm N 315 2 2 2 2 8. Coordinate system: take x-coordinate parallel to the inclined surface and y-coordinate perpendicular to the inclined surface, as shown. First, draw Free Body Diagram: a) Write Newton’s 2 law (Equation of motion) in each coordinate:  ma
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