Coulomb s Law. understand & solve problems using Coulomb s Law. Labs, Activities & Demonstrations:
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1 Add Important oulomb s Law Pag: 431 NGSS Standards: HS-PS-4, HS-PS3-5 oulomb s Law MA urriculum ramworks (006): 5.4 AP Physics 1 Larning Objctivs: 3...1, 3..,, 5.A..1 Skills: undrstand & solv problms using oulomb s Law Languag Objctivs: Accuratly dscrib oulomb s Law using appropriat acadmic languag. St up and solv word problms rlating to oulomb s Law. Labs, Activitis & Dmonstrations: Nots: Van d Graaff gnrator with inrtia balanc pan. hargd balloon or Styrofoam sticking to wall. hargd balloon pushing mtr stick. Elctric charg is masurd in oulombs (abbrviation ). On oulomb is th amount of lctric charg transfrrd by a currnt of 1 ampr for a duration of 1 scond. 1 is th charg of protons. 1 is th charg of lctrons. On proton or lctron (lmntary charg) thrfor has a charg of
2 Add Important oulomb s Law Pag: 43 Bcaus chargd particls xrt a forc on ach othr, that forc can b masurd and quantifid. Th forc is dirctly proportional to th strngths of th chargs and invrsly proportional to th squar of th distanc. Th formula is thrfor: whr: kq q r 1 = lctrostatic forc of rpulsion btwn lctric chargs. A positiv valu of dnots that th chargs ar rplling (pushing away from) ach othr; a ngativ valu of dnots that th chargs ar attracting (pulling towards) ach othr. k = lctrostatic constant = Nm Nm.010 q 1 and q = chargs 1 and rspctivly r = distanc (radius, bcaus it gos outward in vry dirction) btwn th cntrs of th two chargs This formula is oulomb s Law, namd for its discovrr, th rnch physicist harls-augustin d oulomb.
3 Add Important oulomb s Law Pag: 433 Sampl problm: Q: ind th forc of lctrostatic attraction btwn th proton and lctron in a hydrogn atom if th radius of th atom is 37.1 pm A: Th charg of a singl proton is , and th charg of a singl lctron is pm kq q d 1 ( )( ( N 11 m 1 )( Th valu of th forc is ngativ, which signifis that th forc is attractiv. Homwork Problms ) 1 1. What is th magnitud of th lctric forc btwn two objcts, ach 6 with a charg of.00 10, which ar sparatd by a distanc of 1.50 m? Is th forc attractiv or rpulsiv? ) Answr: N, rpulsiv
4 Add Important oulomb s Law Pag: 434. An objct with a charg of is sparatd from a scond objct with an unknown charg by a distanc of m. If th objcts 6 attract ach othr with a forc of N, what is th charg on th scond objct? Answr: An objct with a charg of q1 is sparatd from a scond objct with an unknown charg by a distanc d. If th objcts attract ach othr with a forc, what is th charg on th scond objct? Answr: q d kq 1 4. Th distanc btwn an alpha particl and an lctron is m. What is th forc of lctrostatic attraction btwn th chargs? 5 Answr: N
5 Add Important oulomb s Law Pag: Thr lmntary chargs, particl q 1 with a charg of , particl q with a charg of of , and particl q 3 with a charg, ar arrangd as shown in th diagram blow. What is th nt forc (magnitud and dirction) on particl q 3? Answr: N at an angl of 65. abov th x-axis.
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