Scientific dialogues for the instruction and entertainment of young people : in which the first principles of natural and experimental philosophy are fully explained and illustrated / by J. Joyce.

  • Jeremiah Joyce
Date:
1855
Catalogue details

Licence: Public Domain Mark

Credit: Scientific dialogues for the instruction and entertainment of young people : in which the first principles of natural and experimental philosophy are fully explained and illustrated / by J. Joyce. Source: Wellcome Collection.

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    ^'^ MECHANICS. Ch. It is then from the same cause, I ima^inr^ thnt v i drop a penny and a piece of wood into av^ti P I ' ^, ^ sinks 'a little, yet,1s ^^^n Ts'tl It ^0=7; ttTel;'- medium it rises as before observed^ TheTrm^^^^^ will explam m our next conversation. ^omentum 1 QUESTIONS FOR EXAMINATION How IS the attraction of gravitation uetinecl ?—Gi ve some familiar instances 111 wliich tlie law of gravity or gravita- tion acts. —In what direction do bo- dies fall towards the earth?—Is this a general law without any exceptions '— tliat gravity acts ahke on all Sles .vfter virS^t^' '^ ' '''''' c]ty ?—Explam to me what is meant by velocity.—Are velocity and swiftness sy- nonymous terms ?-Howis the velocity ot a body measured? —If a penny- piece and a feather be let faU together how is it that the penny reaches the *TrnnnrI fit-c,*-o o earth fall towLs it w^ ^.S^o! I f ^rt CONVERSATION VI. OF THE ATTKACTION OF GRAVITATION. £mma. The term wome?aum, which you made use of yes- terday, you promised to explain to us, to-day: what isTt, Kpa^ tliftl understood what I have said respectL- the ve ocity of movmg bodies, you will easily comprehend what IS meant by the word momentum The momeniiim, or moving force of a body, is the Qua7itifu weight mu-ltiphed into its velocity. The quicker a body moves the greater will be the force with which it wiU sti-ike against another body. For instance, you may place very gently a pound-weight upon a china plate without any dan-e?
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