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acquired action angle applied ascend atmosphere attached axis axle balance base body bulk called carry centre of gravity closed column common construction cord cubic density descends Describe diameter direction distance earth elastic equal equilibrium Examples exerted Explain falling feet fixed fluid foot force forces acting fulcrum Give given greater horizontal inches inches long inclined plane keep kind length lever machine magnitude mass means measured mechanical mercury momentum motion moveable pulleys moving opposite parallel particles passes piston placed position pressure principle produce quantity question radius raise represent resistance rest resultant rises round screw Series side space specific gravity square stone straight string supported suppose surface suspended tension threads tube unit upwards valve velocity vertical vessel weight wheel whole
Σελίδα 148 - If three forces acting at a point are in equilibrium they can be represented in magnitude and direction by the three sides of a triangle taken in order.
Σελίδα 115 - To explain the construction of the common barometer, and to shew that the mercury is sustained in it by the pressure of the air on the surface of the mercury in the basin.
Σελίδα 136 - Enunciate the principle of virtual velocities, and prove it in the case of a bent lever.
Σελίδα 92 - The equatorial diameter of the earth exceeds the polar diameter by about twenty-six miles ; consequently the poles must be nearer to the centre of the earth's attraction than the equator, and gravity must also operate with greater force at the poles than at the equator. Hence, also, the length of a pendulum, to vibrate in any given time, must vary with the latitude of the place. $ The pendulum of a clock is made longer or shorter by means of a screw beneath the weight or ball of the pendulum. The...
Σελίδα 108 - ... 14. If a body of uniform density floats in a fluid, the volume of the part immersed is to the volume of the whole body as the specific gravity of the body is to the specific gravity of the fluid. A piece of cork weighing...
Σελίδα 70 - If three forces, represented in magnitude and direction by the sides of a triangle, act on a point, they will keep it at rest.
Σελίδα 2 - Force is that which changes, or tends to change, the state of rest or motion of the body acted upon.
Σελίδα 13 - F, the weight being between the fulcrum and the power. In a lever of the third kind, fig. III., the power P and the weight W act on the same side of the fulcrum F, as in the latter case, but the power, in this case, is between the fulcrum and the weight.