An Elementary Treatise on Mechanics: Embracing the Theory of Statics and Dynamics, and Its Applications to Solids and Fluids

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Harper, 1855 - 307 pàgines
 

Continguts

Definition of Center of Parallel Forces
44
Equality of the Moment of the Resultant with the Sum of the Components
45
Definition of Moment of a Force in reference to a Plane
46
Conditions of Equilibrium of any Number of Parallel Forces
47
Condition of Rotation
48
When in Equilibrium each Force equal in Magnitude to the Res others
49
Equilibrium independent of their Direction
50
Examples CHAPTER III
51
Definition of a Statical Couple
52
Definition of the Arms of a Couple
53
Definition of the Moment of a Couple
54
A Couple may be turned round in its own Plane
55
A Couple may be removed parallel to itself in its own Plane
56
A Couple may be removed to a Parallel Plane
57
Couples are equivalent when their Planes are Parallel and Moments
58
Couples may be changed into others having Arms of a given Length
59
Definition of the Axis of a Couple
60
Properties of an Axis
61
Definition of the Resultant of two or more Couples
62
Equality of the Moment of the Resultant with the Sum of the Mon Components
63
Equality of the Axis of the Resultant with the Sum of the Axes o ponents
64
The Resultant of two Couples inclined to each other
65
Representative of the Axis of the Resultant of two Couples
66
Parallelogram of Couples
67
Resultant of any Number of Concurring Forces
68
Directions of the Rectangular Components involved in their Trigonometric
69
Conditions of Equilibrium of Concurring Forces
70
Resultant Force and Resultant Couple when the Forces do not concur
71
Construction of the Results
72
Equation of the Resultant
73
Equilibrium of nonconcurring Forces
74
Equilibrium when there is a fixed Point in the System
75
Equilibrium of a Point on a Plane Curve
76
Laws of Gravity
84
Definition of a Heavy Body
85
Definition of the Weight of a Body
86
Definition of its Mass
87
Expression for Weight
88
Definition of Density
89
Another Expression for Weight
90
Relations of Masses to Volumes of the same Density
91
Relations of Densities to Volumes of the same Mass
92
Relations of Densities to Masses of the same Volume
93
Definition of Center of Gravity
94
Connection of the Center of Gravity with the Doctrine of Parallel Forces
95
Definition of a Body symmetrical with respect to a Plane
96
Position of its Center of Gravity
97
Definition of a Body symmetrical with respect to an Axis
98
Position of its Center of Gravity
99
Center of Gravity of a Body symmetrical with respect to two Axes
100
Definition of Center of Figure
101
Center of Gravity of any Number of heavy Particles
102
Their Center of Gravity when their Positions are given by their Coordinates
103
Their Center of Gravity when they are all in the same Line
104
Their Center of Gravity when they are Homogeneous
105
The Center of Gravity of the Whole and a Part given to find that of the other Part
106
Examples1 Of a Straight Line2 Triangle3 Parallelogram4 Polygon 5 Triangular Pyramid6 Any Pyramid7 Frustum of a Cone8 Perimeter of a Triangle...
107
When the Body has a Fixed Point in
108
Definition of Stable Unstable and Neutral Equilibrium
109
Position of the Center of Gravity when the Equilibrium is Stable and when Unstable
110
Law of Graduation 182 Bent Lever Balance 183 Law of Graduation
110
Pressure on the Fixed Point
111
Position and Pressure when there are two Fixed Points
112
Position and Pressure when there are three Fixed Points
113
Position and Pressure when a Body touches a Horizontal Plane in one Point
114
Position and Pressure when a Body touches a Horizontal Plane in two Points
115
Position and Pressure when a Body touches a Horizontal Plane in three Points
116
Position and Pressure when a Body touches a Horizontal Plane in any Number of Points
117
Measure of the Stability on a Horizontal Plane
118
Case of a Body on an Inclined Plane
119
Examples
120
General differential Expressions for the Center of Gravity of a Plane Curve
122
General differential Expressions for the Center of Gravity of a Plane Area
123
General differential Expressions for the Coordinates of a Surface of Revolution
124
General differential Expressions for the Coordinates of a Solid of Revolution
125
Determination of a Surface of Revolution
126
Determination of a Solid of Revolution
127
Examples1 Of a Circular Arc2 Circular Segment3 Surface of a Spherical Segment4 Spherical Segment
128
Examples on the preceding Chapters CHAPTER VI
129
Classification of the Mechanical Powers I THE LEVER
130
Definition of a Lever
131
Kinds of Lever
132
Conditions of Equilibrium when the Forces are Parallel
133
Conditions of Equilibrium when the Forces are Inclined
134
Conditions of Equilibrium when the Lever is Bent or Curved 78
135
Conditions of Equilibrium when any Number of Forces in the same Plane act on a Lever of any FormExamples
136
Definition of Wheel and Axle 86
137
Conditions of Equilibrium when two Forces act Tangentially to the Surface of the Wheel and Axle
138
Perpetual Lever
139
Pressure on the Axis
140
Conditions of Equilibrium of any Number of Forces
141
Definition of Cogged Wheels Crown Wheels Beveled Wheels Pinions Leaves
142
Conditions of Equilibrium in Cogged Wheels
143
Conditions of Equilibrium when the Cogs are of equal Breadth
144
Conditions of Equilibrium in Cogged Wheels and Pinions III THE CORD
145
Definition of the CordOf Tension
146
Conditions of Equilibrium when there are three Forces
147
Conditions of Equilibrium when the Ends are fixed 91
148
Conditions of Equilibrium when the Ends are fixed and a third Force applied to a Running Knot
149
Conditions of Equilibrium when there is any number of Forces
150
Relations of the Forces when in Equilibrium
151
Relations of the Forces when the Ends are Fixed and the Forces Parallel
152
Relations of the Forces when the Ends are Fixed and the Forces are Weights
153
Equilibrium in the thirdExamples
162
Condition of Equilibrium
185
Conditions of Equilibrium in a Combination of Levers
186
Conditions of Equilibrium in the Endless Screw
187
Conditions of Equilibrium in any Combination of the Mechanical Powers
188
Conditions of Equilibrium in the Knee CHAPTER VII
189
Preliminary Considerations
190
Application to the Wheel and Axle
191
Application to Toothed Wheels
192
Application to Movable Pulley with Parallel Cords
193
Application to the first System of Pulleys
194
Application to the second System 116
195
Application to the third System
196
Application to the Inclined Plane
197
Application to the Wedge
198
Application to the Lever of any Form
199
Application to the single Movable Pulley with inclined Cords
200
Definition of FrictionKinds CHAPTER VIII
201
Measurement of Friction
202
Laws of Friction
203
Value of the Coefficient of Friction
204
Limits of the Ratio of the Power to the Weight in the Screw
206
One Limit obtained directly from the other Examples
207
124
208
In Dynamics Time an Element
209
Definition of Motion
210
Definition of Absolute Motion
211
Definition of Relative Motion
212
Definition of VelocityIts Measure
213
Definition of Variable VelocityIts Measure
214
Definition of Relative Velocity
215
Definition of InertiaFirst Law of Motion
216
Definition of Center of Inertia
217
Definition of the Path of a Body
218
Definition of Free and Constrained Motion
219
Definition of an Impulsive Force
220
Definition of an Incessant Force
221
Definition of a Constant ForceIts Measure
222
Definition of a Variable ForceIts Measure
223
Definition of MomentumIts MeasureOf Living Force
224
Definition of a Moving ForceIts Measure
225
The second Law of Motion
226
The third Law of Motion CHAPTER I
227
Point to which the Force must be applied
228
General Equation of Uniform Motion
229
Relation of Spaces to Velocities when the Times are Equal
230
Relation of Spaces to the Times when the Velocities are Equal
231
Relation of Velocities to the Times when the Spaces are Equal
232
Measure of an Impulsive Force
233
The Velocity resulting from the Action of several Forces
234
Parallelogram of Velocities
235
Rectangular Composition and Resolution of Velocities
236
Relations of Space Time and Velocity of two Bodies moving in the same Straight Line
237
Relations of Space Time and Velocity of two Bodies moving in the Circumference of a Circle
238
Examples CHAPTER II
239
Definition of Direct Central and Oblique Impact
240
Definition of ElasticityPerfectImperfectIts Modulus
241
Definition of Hard and Soft
242
Velocity of two Inelastic Bodies after Impact
243
Loss of Living Force in the Impact of Inelastic Bodies
244
Velocities of imperfectly Elastic Bodies after Impact
245
APPLICATION OF THE INTEGRAL CALCULUS TO THE DETERMINATION OF THE CEN TER OF GRAVITY
247
Definition of Angles of Incidence and Reflection
249
Motion of an Inelastic Body after Oblique Impact on a Hard Plane
250
Motion of an Elastic Body after Oblique Impact on a Hard Plane Page
251
Direction of Motion before Impact that a Body after Impact may pass through given Point
252
Measure of the Modulus of Elasticity
253
143
254
Examples CHAPTER III
255
Uniformly accelerated MotionAcquired Velocity
256
Space in Terms of the Force and Time
257
Space in Terms of the Force and Velocity
258
Space described in the last n Seconds 153
259
The Velocity and Space from the joint Action of a Projectile and Constant Force
260
The Velocity when the Space is given
261
Velocity lost and gained by the Action of a Constant Force when the Space
262
the same 263 Scholium on Universal Gravitation
263
Scholium on the Numerical Value of the Force of Gravity
264
Examples
265
The Path of a Projectile is a Parabola
266
Equation of the Path when referred to Horizontal and Vertical Axes
267
Definition of Horizontal RangeTime of FlightImpetus
268
Time of Flight on a Horizontal Plane
269
Range on a Horizontal PlaneThe same for two Angles of Elevation
270
Greatest Height
271
Range and Time of Flight on an Inclined Plane and Coordinates of Point of Impact
272
Formula for Velocity of a Ball or Shell
273
Examples
274
Relations of Space Time and Velocity
275
Velocity down the Plane and its Height
276
Times down Inclined Planes of the same Height
277
Relations of Space Time and Velocity when projected up or down the Plane
278
Time of Descent down the Chords of a Circle 169
279
Straight Line of quickest Descent from a Point within a Circle to its Circumference
280
Straight Line of quickest Descent from a given Point to an Inclined Plane
281
Motion of two Bodies suspended by a Cord over a Fixed Pulley
282
Motion of two Bodies when the Inertia of the Pulley is considered II MOTION IN CIRCULAR ARCS
283
Velocity acquired down the Arc of a Circle
284
Velocity lost in passing from one Side of a Polygon to the next
285
Definition of Centrifugal and Centripetal Force
289
173
292
Diminution of Gravity in different Latitudes by the Centrifugal
295
Expression for the Time given
302

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Passatges populars

Pàgina 213 - The squares of the periods of revolution of any two planets are proportional to the cubes of their mean distances from the sun.
Pàgina 247 - The specific gravity of a body is the ratio of the weight of the body to the weight of an equal volume of some other body taken as the standard of comparison, and whose specific gravity, therefore, is taken as the unit.
Pàgina 181 - TT is constant, or, the time of vibration of a pendulum varies directly as the square root of the length, and inversely as the square root of the accelerating force.
Pàgina 8 - If three forces, acting at a point, can be represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium.
Pàgina 6 - If two forces be represented in magnitude and direction by the two adjacent sides of a parallelogram, the diago nal will represent their resultant in magnitude and direction.
Pàgina 181 - ... of that due to the vertical height of the plane, compare the time of descent down the plane with that of falling through its height. Ex. 7. A given weight P draws another given weight W up an inclined plane of known height and length, by means of a string parallel to the plane. When and where must P cease to act that W may just reach the top of the plane ? Ex. 8. Divide a given inclined plane into three parts such that the times of descent down them successively may be equal. that acquired in...
Pàgina 9 - If any number of forces, acting at a point, can be represented in magnitude and direction by the sides of a polygon taken in order, they will be in equilibrium.
Pàgina 169 - O, and, therefore, the time down it will be greater than the time down PB, which is therefore the line of quickest descent to the circumference of C. 281. PROP. To find the straight line of quickest descent from a given point to a given inclined plane. Let A be the given point, AG a vertical line passing through this point, and AB a perpendicular to the inclined plane BG. The line AC, bisecting the angle BAG, will be the line required.
Pàgina 213 - Kepler's laws, the areas described by the radius vector are proportional to the times, and when this is the case, by Art.
Pàgina 155 - ... with a force varying inversely as the square of the distance of the body from the center, but a body or particle in the interior with a force varying directly as its distance from the center.

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