To understand kinetic and static friction. a block of mass m lies on a horizontal table. the coefficient of static friction between the block and the table is μs. the coefficient of kinetic friction is μk, with μk< μs. a- suppose you want to move the block, but you want to push it with the least force possible to get it moving. with what force f must you be pushing the block just before the block begins to move? express the magnitude of f in terms of some or all the variables μs, μk, and m, as well as the acceleration due to gravity g. b- suppose you push horizontally with half the force needed to just make the block move. what is the magnitude of the friction force? express your answer in terms of some or all of the variables μs, μk, and m, as well as the acceleration due to gravity g. c- suppose you push horizontally with precisely enough force to make the block start to move, and you continue to apply the same amount of force even after it starts moving. find the acceleration a of the block after it begins to move. express your answer in terms of some or all of the variables μs, μk, and m, as well as the acceleration due to gravity g.

Acetic acid  /əˈsiːtɪk/, systematically named  ethanoic acid  /ˌɛθəˈnoʊɪk/, is a colourless liquid  organic compound  with the  chemical formula  ch3cooh (also written as ch3co2h or c2h4o2). when undiluted, it is sometimes called  glacial acetic acid.  vinegar  is no less than 4% acetic acid by volume, making acetic acid the main component of vinegar apart from water. acetic acid has a distinctive sour taste and pungent smell. in addition to household vinegar, it is mainly produced as a precursor to  polyvinyl acetate  and  cellulose acetate. it is classified as a  weak acid  since it only partially  dissociates  in solution, but concentrated acetic acid is corrosive and can attack the skin.acetic acidnamespreferred iupac nameacetic acidsystematic iupac nameethanoic acidother namesvinegar (when dilute); hydrogen acetate; methanecarboxylic acid[1][2]identifierscas number64-19-7  3d model (jsmol)interactive image3dmetb00009 reference506007chebichebi: 15366  chemblchembl539  chemspider171  drugbankdb03166  echa infocard100.000.528ec number200-580-7e numbere260  (preservatives)gmelin reference1380iuphar/bps1058keggd00010  meshacetic+acidpubchem  cid176rtecs numberaf1225000uniiq40q9n063p  un number2789inchiinchi=1s/c2h4o2/c1-2(3)4/h1h3,(h,3,4)  key:   qtbsbxvteameqo-uhfffaoysa-n  smilescc(o)=o