College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Transcribed Image Text:Mass
Mass
Weight
Mass
Mass
Accele
Accele
ked Son
Mass
Mass
Distance
stance
Distance
(2)
()
114. As an astronaut travel
Earth to a position tha
away from the center
Distance
(2)
()
()
(1)
bums
111. The following graph shows the relationship
between weight and mass for a series
of objects.
(1) mass decreases
(2) mass remains the s.
(3) weight increases
(4) weight remains the
tists
dcasts
115. An 800-newton person
elevator. If the upward
Mass
on the person is 600 ne
AYLISTS
What is represented by the slope of the graph?
112. A 60.-kilogram astronaut weighs 96 newtons
on the surface of the Moon. Calculate the
acceleration due to gravity on the Moon.
(1) at rest
(2) accelerating upward
(3) accelerating downw
(4) moving downward.
kTok son
reet Dan
Friction
day's To
The force that opposes the relative motion of two objects in contact is called
friction. A vector quantity, friction is always parallel to the two surfaces in
contact and acts in the direction that opposes the slipping motion. The
force of friction, F, is directly proportional to the magnitude of the normal
force, Fx. The normal force is the force pressing the two contacting surfaces
together. On a horizontal surface, the normal force is equal in magnitude
and opposite in direction to the weight, F or mg, of the object resting on
the surface. For an object on a surface inclined at an angle 0 to the
horizontal, the normal force is equal in magnitude and opposite in
direction to the component of the object's weight perpendicular to the
inclined surface. That is, on an incline, the magnitude of the normal force
EN is equal to F, cos 6 or mg cos 0. The force of friction, which depends
upon the nature of the two surfaces in contact, is givern by this formula.
pod Bod
rty 2019
en Hits 2
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The constant, u, is the coefficient of friction, which is the ratio of the
frictional force to the normal force, and thus has no unit.
The formula inmplies that the frictional force is independent of the area in
contact and the speed of motion. For example, a rectangular block of wood,
smooth on all sides, has dimensions 4.0 cm X 6.0 cm x 10. cm, and thus,
PRTAR
AON
1.
23
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