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algebraical sum applied arms attached axis axle balance base beam body called centre of gravity CHAPTER completely components conditions of equilibrium considered cord couple cylinder determine diagonal direction direction and magnitude distance Draw equal equal and opposite extremities feet fixed point forces acting friction fulcrum given greater Hence horizontal inches inclined plane intersection joining length lever lies line of action meet middle point moments motion opposite directions parallel forces parallelogram particles pass perpendicular placed point of application position pressure proportional pulley radius reaction remain replaced represent resolved respectively rests resultant right angles round scale-pans sides Similarly smooth straight line string supposed surface suspended system of forces taking tension third three forces tion triangle true turn uniform vertex vertical wedge weight wheel zero
Page 7 - The straight line joining the middle points of two sides of a triangle is parallel to the third side, and equal to half of it.
Page 18 - When three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two.
Page 14 - If three forces acting at a point be represented in magnitude and direction by the sides of a triangle taken in order, they will be in equilibrium.
Page 55 - These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Page 96 - The altitude of a right cone is h, and the diameter of the base is b ; a string is fastened to the vertex and to a point on the circumference of the circular base, and is then put over a smooth peg: shew that if the cone rests with its axis horizontal the length of the string is V(&2 2 XI.
Page 47 - When a body is suspended from a point, it will rest with its centre of gravity in the vertical line passing through the point of suspension.
Page 43 - ... the sides of the triangle formed by joining the middle points of the sides of the original triangle...
Page 32 - The perpendicular distance between the lines of action of the two forces is called the arm, and the product of one of the forces and the arm is called the moment of the couple.