2021-2022学年广东省湛江市八年级下册期末物理模拟试题（含解析）

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17ூ௃ᵱøᡠ²Ḅᵨbᙠᐸ=tᔣæçᔣÅḄñòlG,᝞YᡠW:ூ௃ùú☟¦ᙠûᢣᑣüýᜐlúḄ=þùú²ᑮGÿᢣḄᢝF,⊝ᔣᢝᔣ᪗Ḅ,ᩩ!"Ḅ#$%&᝞(ᡠ*+,ᫀ.6⚓ᐳ11⚓

1819.ூ67௃9:஺:<=F<ᵨ!Ḅᚖ!"ᓽB=ḄCᩨᩚFGᡠᢞᱥJᩨᩚKLḄᔣḄMBNḄOᔣᔣ᝞(ᡠ*+20.ᩈᙽᙠU☢W=ḄXYZᣚ\]$^_N`aூ67௃b1cdeᩈᙽᙠU☢W=ḄXYfBgdehᳫᐹᨵ=aḄᜧmᱥᳮopqrsO\BZᣚ\஺b2c[3](wrswx&yhᳫ&yz☢`&Ḅ{$ᵫ☟~=ᓽhᳫ=ᑮz☢GḄ]$f`&Ḅᓽ=aᜧmᱥJ=]$Ḅᐵ஺b3c[4]`&hᳫ%&Ḅ{$=ᑮz☢GḄ]$%&ᓽrsḄfhᳫ=a^_Ḅᐵ஺b4c[5]ᩈᙽᵫᑮU☢ḄN<ᵨNᦋgᩈᙽḄ=᝱xᨬ஺b5c[6]U☢ᐝWrs`aᑮḄBᩈᙽ¡¢hᳫᱥJy£,ᫀ.7⚓ᐳ11⚓

19¥ᒴ]!=`§¨\©9ᩈᙽª=ḄXYde=aḄᜧm஺21.«◍$®¯ᜧঞট²®ᜧm³ூ67௃(1)[1]rswm¶©9·¸¹ºḄ«◍$»᧜®Ḅ<ᵨᦔ¾qO\¿Zᣚ\஺(2)[2]de(ᵬÁÂÃÄ☢Å%&®`&®¯ᜧ¹ºḄ«◍$¯ᜧᦑÃÇÈÉ+ᙠ☢ÅyÊË®¯ᜧ®Ḅ<ᵨᦔ¾¯¶Ì஺[3]জÎᑐ⌕ÑÒÓyÓfBgᙠ®yÊËÔm☢ÅÕᜧ®Öᦑজ`ᔠ⚪ঝÚᒹ⌕ᵨÜḄÝÞf®yÊËÕᜧ☢ÅᩭÔm®Öᦑঝ`ᔠ⚪ঞàá▲f☢ÅyÊËÔm®ᩭÔm®Öᦑঞᔠ⚪টã®äåæ^_çᜧḄèéf☢ÅyÊËÕᜧ®ᩭÕᜧ®Öᦑটᔠ⚪஺ᦑ⌱ঞট஺(3)[4][5]®Ḅ<ᵨᦔ¾☢ÅḄᐵ⌕ëᑴ®ᜧm%&(²wíîUïᜐ☟~᝱ᑣᢣíîḄ®fy⊝(òíîᵫíîḄḄ<ᵨóÇíîOḄíîḄ®mOḄíîḄ®ᦑ(òḄO\`ᔠᳮôfõᨵëᑴ®ᜧm%&஺(4)[6]®ÖḄᜧm®ḄᜧmÁ☢Åᨵᐵ(ᵬwḄẈᙽªᑮ÷☢®ḄᜧmÁ☢Åø`®Öù`Ẉᙽ÷☢Ḅ®Ö³Ẉᙽ¹ºḄ®Ö஺22.ᵬᒴ]0.441.7%1ஹ2¯ᜧ1.3ூ67௃(1)[1]ᵫ⊤w.yýrsᦪÿ
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20ZLIRᜧ\]^QRSTᦪ᝞)`ᡠTᑖb.0.2N,IRᔆ.0.4N஺[4]f567+,-Ḅghᦔ᳛O.5NxO.lmxl00%«41.7%0.4Nx0.3mo3p[5][6]32567B+,-Ḅ+,r3s1ஹ2u567v:ᵨᵬxyzḄᦑ|}~1ஹ2u567ᦪ24+,-ᱥᜧghᦔ᳛ᜧ஺o4p[7]34567Ḅᨵᦔsᦪ.4,ᙠᶍ᥅Ḅ|}35ᦪ+,Ḅ.Gs/rAF-Gᢚ4xO.7N-1.5N=1.3N23.RM⊝☢00.52.22ᩈḄᙳᒴூ௃o1p[1]᪷RM⊝
ᵨ]^QRS£¤M¥ᔣIḼᱥᙽ/zᒴHE¨©]^QRSTᦪZL+᥅RḄᜧ\஺o2p[2]ᵬஹ`u)ªᑴ¬Rᜧ\®¯☢°±ᙠ☢ᡠ²ḄR4³J☢+᥅Rᜧ஺[3]ᙠ/)Bᱥᙽ8´µ4¶ᒴHE¨©Jᱥᙽ8®·LᱥᙽZ☟ºᡠ2ᱥᙽ8²ᑮḄ᥅R.0஺o3p[4]+᥅Rᜧ\¼☢ᡠ²ḄRᜧ\ᡂ¾~ᐸ⊤ÁÂ.ᡝ“N,ᙠ)`BÅ/²ᑮḄR.5N,Æ=2.5N,ᑣN¼ÈÉ⊤☢Ḅ᥅Êᦪo4p[5]CᵨË=2.2NḄ¤MIRI☟ºḄᱥᙽJᱥÌÍᨵÎIᡠ2ᱥᙽ²ᑮḄ᥅R.☟᥅Rᜧ\:2.2N஺[6]ÅᵨË=2.8NḄ¤MIRIᱥᙽᱥᙽÏzÐH©©J²ᑮḄ᥅Rᜧ\:2N஺o5p[7]67}B᝞Ñ]^QRSḄTᦪÒ᧕Ô³Õ:ᩈḄᙳᒴ⌼ᡂḄ஺24.(1)200N×(2)6Nூ௃Uᫀ39⚓ᐳ11⚓

21(1)ÙÚᙠ¤MÙ☢©JÙÚ·Ù☢ḄRZLÛᓽF=G=mg=20kgx1ON/kg=200N(2)ÚzᒴHE¨©J²ᑮḄÝR¼ÞRᜧ\®ZᓽF'=fG=0.03x200N=6N=/JU(1)ÙÚᙠ¤MÙ☢©JÙÚ·Ù☢ḄR.200N×(2)C©ᕒ¤MÝR.6NJាÕÝḼÙÚzᒴHE¨©஺25.(1)1800J×(2)2400J×(3)75%×(4)300Nூ௃(1)áâãä.1åG=1800NḄᱥÌæçᏝzḄᨵᵨé=G/i=1800Nxlm=1800J(2)ê☢ë.2å6▭IR.F=1200N,æçᏝzḄéW=Fs=1200Nx2m=2400J&(3)ê☢Ḅghᦔ᳛(4)æçᏝzḄí᜜éW^W-%=2400J-1800J=600Jᱥᙠê☢²ᑮ᥅R^600J/===300Ns2mU(1)æçᏝzḄᨵᵨé1800J×(2)æçᏝzḄé2400J×(3)ïê☢Ḅghᦔ᳛75%×(4)ᱥᙠê☢²ᑮ᥅R300N஺26.1.5x1077.2x1048x108ðᜧðᜧ2.4696x107ñòRóôᦋöᡂ᪶Róôூ௃Uᫀ310⚓ᐳ11⚓

22(1)[1]óøô…ḄH.v=36km/h=10in/sᱫ
P1.5X.Q-WF===15X1()7Nv10m/s[2]2hḄs=vt=36kin/hx2h=72km=7.2x104m(2)[3]“#$…”'()ᙠᜧ,-.'()Ḅ/0w=8OOOOt=8xlO7kgᜐ89:;᝱.=ᑮḄ:?8@4ᓫ=G=mg=8x107kgx10N/kg=8x1OSN(3)[4][5][6]FGᵫIJᑮKᵬM.NOPᜧ.QOPᜧ.ᦑJST@USVPᜧ;…(GXJGYᡠ[Ḅ\W=FS=2X117600Nx105m=2.4696xlO7J(4)[7]“#$…”_`ᵨḄbcdJ.ef`ᵨ᪶J.h_ᐹᨵklḄGJឋ;⁚ḕpᜧ0qrT(@ᔴt.uvwxyᙢT{|}~Ḅ஺ᫀ11⚓.ᐳ11⚓