Scientific amusements . ecausethe attraction of the earth is greater than the attractionthey relatively and collectively exercise towards eachother. But if the size of the balls be different, the attrac-tion of the greater will be morq evident, as shown opposite GRAVITY. 33 where the points of meeting are indicated experiments will illustrate the phenomena offalling bodies. Gravity is the cause of this, becauseevery object on the surface of the earth is very muchsmaller than the earth itself, and therefore all bodiesfall towards the centre of the earth. A certain time is -1
Scientific amusements . ecausethe attraction of the earth is greater than the attractionthey relatively and collectively exercise towards eachother. But if the size of the balls be different, the attrac-tion of the greater will be morq evident, as shown opposite GRAVITY. 33 where the points of meeting are indicated experiments will illustrate the phenomena offalling bodies. Gravity is the cause of this, becauseevery object on the surface of the earth is very muchsmaller than the earth itself, and therefore all bodiesfall towards the centre of the earth. A certain time is -1 Attraction of gravitation (i\ thus occupied, and we can find the velocity or rapidity ofa falling body very easily. On the earth a body, if letfall, will pass through a space sixteen feet in the firstsecond ; and as the attraction of the earth still continuesand is exercised upon a body already in rapid motion,this rate of progress must be proportionately as when steam is kept up in an engine running down. Attraction of gravitation (2), hill, the velocity of the train will rapidly increase as itdescends the gradient. A body falling, then, descends sixteen feet in the firstsecond, and for every succeeding second it assumes agreater velocity. The distance the body travels has beencalculated, and the space it passes through has been foundto increase in proportion to the square of the time it takesto fall. For instance, suppose you drop a stone from thetop of a cliff to the beach, and it occupies two seconds in 34 SIMPLE PHYSICS. falling, if you multiply 2X2, and the result by sixteen,you will find how high the cliff is : in this (supposed) caseit is (omitting decimals) sixty-four feet high. The depthof a well can also be ascertained in the same way, leavingout the effect of air resistance. But if we go up into the air, the force of gravity willbe diminished. The attraction will be less, because weare more distant from the centre of the earth. Thisdecrease is scarcel
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
