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If three forces, represented in magnitude and direction by the sides of a triangle, act on a point, they will keep it at rest.
The Mechanical Euclid: Containing the Elements of Mechanics and Hydrostatics ... - Σελίδα 46
των William Whewell - 1837 - 182 σελίδες
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## Practical Mechanics: An Elementary Manual for the Use of Students in Science ...

Sidney H. Wells - 1898 - 220 σελίδες
...experiment may be regarded as a verification. Triangle of Forces. If three forces acting at a point can be represented in magnitude and direction by the sides of a triangle taken in order, they are in equilibrium; and conversely, If three forces acting at a point are in equilibrium, and...

## Exercises in Practical Physics for Schools of Science, Τόμος 1

...You have therefore proved the triangle of forces, viz.: When three forces acting at a point can be represented in magnitude and direction by the sides of a triangle taken in order, they are in equilibrium. 88. Friction. (a) Fix a small staple, such as is used to fasten wire netting,...

## Kinematics, statics, kinetics, statics of rigid bodies and of elastic solids

Augustus Jay Du Bois - 1902
...must act in their plane and be equal and opposite to the third. (3) If three concurring forces are represented in magnitude and direction by the sides of a triangle taken the same way round, the resultant is zero and the forces are in equilibrium. (4) Hence, if three concurring...

## A Text-book of Applied Mechanics and Mechanical Engineering, Τόμος 2

Andrew Jamieson - 1903
...taken in the reverse direction. Hence, if there be simultaneously impressed on a point three velocities represented in magnitude and direction by the sides of a triangle taken in order, then the point will remain at rest.* Polygon of Velocities. — If several component velocities be...

## Woolwich Mathematical Papers for Admission Into the Royal Military Academy ...

Eldred John Brooksmith - 1904
...answered.] Gravitational acceleration = 32 foot-second units. 1. Three forces acting at a point can be represented in magnitude and direction by the sides of a triangle taken in order. Prove, from first principles, that the algebraic sum of the moments of the three forces about any point...

## An Introduction to the Design of Beams, Girders, and Columns in Machines and ...

William Henry Atherton - 1905 - 236 σελίδες
...have now 3 forces meeting at a point and keeping the lever in equilibrium. Hence these forces can be represented in magnitude and direction by the sides of a triangle taken in order. Draw this triangle by setting off W equal to 1 ton and drawing parallels to the other forces. This...

## An Intermediate Course of Mechanics

Alfred William Porter - 1905 - 422 σελίδες
...hour. Give the direction as well as the magnitude of the force. 5. Three forces represented completely by the sides of a triangle taken in order act on a rigid body. Will they keep it in equilibrium ? If they were moved so as to act on a particle, would...

## Mechanics and Hydrostatics for Beginners

Sidney Luxton Loney - 1907 - 290 σελίδες
...is 5 feet; find the resolved parts of its weight along and perpendicular to the plane. a point, be represented in magnitude and direction by the sides of a triangle, taken in order, that is, taken the same way round, they will be in equilibrium. Let the forces P, Q, and R acting at...

## The Architect's and Builder's Pocket-book: A Handbook for Architects ...

Frank Eugene Kidder - 1908 - 1661 σελίδες
...squares of the other two forces. Tlio Triangle of Forces. — III. // three forces actbig on a point be represented in magnitude and direction by the sides of a triangle taken in order, they will keep the point in equilibrium. Thus let P, Q, and R (Fig. ."5) represent three forces acting...

## An Elementary Text-book of Physics, Τόμος 1

Robert Wallace Stewart - 1910
...converse of this theorem states that if three forces acting at a point are in equilibrium they can be represented in magnitude and direction by the sides of a triangle taken in order. Since all triangles, whose sides are parallel to three given directions, must be similar triangles,...