...Triangle of forces : Medi. : A term applied to that proposition which asserts that if three forces, represented in magnitude and direction by the sides of a triangle taken in order, act upon a point, they will be in equilibrium ; and, conversely, if three forces acting upon...

...called the parallelepiped of forces. Tlie Triangle of Forces. — If three forces acting at a point are represented in magnitude and direction by the sides of a triangle taken in order, the three forces are in equilibrium. Any one of the forces is equal in magnitude, and in the...

...ABCDEA is a closed polygon. Hence If any number offorces in the same plane acting on a particle keep it in equilibrium, they may be represented in magnitude and direction by the sides of a closed polygon taken the same way round. This is the graphical condition of equilibrium of forces acting...

...course includes, as a particular case, The Triangle of Forces. // three forces, acting at a point, be represented in magnitude and direction by the sides of a triangle taken one way round, the forces are in equilibrium. It is to be particularly noticed that, in the Polygon...

...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...

...Principle in Design. If throe forces acting in the same plane on a point are in equilibrium, two of them may be represented in magnitude and direction by the sides of a parallelogram, and the third by the diagonal of the parallelogram. This — "the parallelogram of forces"...

...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,...

...Q. 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...

...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...

...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...