Revisão para a Av. Final de Física do 3º trimestre (:
Autor: Joana Maisonnette | Publicado: 2011-11-08T15:54:00-08:00

Galera Salé, é apenas uma revisãozinha, também não estou tão bem assim kkk' Espero que ajude vocês. Ah, escrevi delta porque não consegui colocar o triângulozinho, ok ? Sucessooooo ! (:&nbsp;
Ah, gente. Yasmin Reis da turma E&nbsp;, achou esse link, com algumas questõeszinhas, ok ? Acessem é bem interessante. Ah vejam também no BLOG, no mês de setembro, a discursiva de Física, o exemplo vai ajudar bastante !!http://fisicalivre.org/aoc/2ano_07/2ano_pdfs/Apost2_energia.pdf
http://www.google.com.br/#sclient=psy-ab&amp;hl=pt-BR&amp;source=hp&amp;q=atividade+de+energia+mecanica&amp;pbx=1&amp;oq=atividade+de+energia+meca&amp;aq=0w&amp;aqi=q-w1&amp;aql=&amp;gs_sm=c&amp;gs_upl=3890l4070l1l5290l2l2l0l0l0l0l420l680l2-1.0.1l2l0&amp;fp=1&amp;biw=853&amp;bih=415&amp;bav=on.2,or.r_gc.r_pw.,cf.osb&amp;cad=b
FORÇA Interação entre dois corpos, que pode ser atrativa ou repulsiva. É uma grandeza vetorial.Tipos:&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1- Contato: há o contato entre os corpos.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2-&nbsp; Campo : não precisa de contato. ( Gravitacional, elétrico, magnético) Efeito: mudar a velocidade, equilibrar, deformar.1- Força Gravitacional &nbsp;&nbsp;&nbsp; P= m.g &nbsp;&nbsp;&nbsp; Fg= G(constante de valor 6,67x10-11). m1.m2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;d²
LEIS DE NEWTON:1-&nbsp; Inércia: todo corpo tende permanecer em seu estado natural, em repouso ou velocidade constante, até que uma forma de mesma intensidade ou intensidade superior, atue sobre ele forçando o movimento. 2- Princípio fundamental da dinâmica:&nbsp; Fr= m.a3- Ação e Reação:&nbsp; Há interação de força, entre dois corpos. As forças com mesma direção, porém sentido opostos. Sendo que a&nbsp; força que os corpos exercem, um sobre o outro, é de mesma intensidade. 
FORÇAFr= m.a , Sendo que aceleração pode ser também deltaV&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;deltaT
Ou, outras equações, como: V= Vo+ a.t &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;V²= Vo+2.a. rS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;S= So+Vo .t + a.t²&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2Fr= F1 ≠ F2Fr=&nbsp; F1-F2 ( F1&gt;F2)Fr=&nbsp; raiz quadrada de F1²+F2²
TRAÇÃO ( Tensão)T=P &nbsp;– quando um corpo encontra-se preso ao teto, pendurado por uma corda. Há a tração da corda no teto e a tração do corpo na corda, por causa do peso. Em uma superfície plana -&nbsp;&nbsp;&nbsp; (parede) T --&gt;&nbsp;-------&lt;--&nbsp;&nbsp;T (homem)&nbsp; &nbsp;&nbsp;- &nbsp;Por exemplo: quando se tem uma corda &nbsp;presa em uma parede e sendo puxada por um homem, há a tração da corda na parede e a tração da corda sendo puxada pelo homem. 
FORÇA NORMAL ° Em uma superfície plana: N=P° Em um plano inclinado: N=F+P° Um corpo preso no teto: N=F-P 
PARA DETERMINAR SE UM CORPO ESTÁ EM REPOSO ou MOVIMENTO:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Equilíbrio:&nbsp; a=0 ( igualdade ) e ( repouso M.U.)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Movimento acelerado:&nbsp; a ≠ 0
FORÇA DE ATRITO (Fat)1- Repouso:&nbsp; Quando&nbsp; FATe = F
2- FATmáx = Me . N&nbsp;&nbsp;&nbsp;&nbsp; Me =&nbsp; coeficiente de atrito estático&nbsp;&nbsp;&nbsp;&nbsp; N = força normal
3- FATd = Md . N&nbsp;&nbsp;&nbsp;&nbsp; Md = coeficiente de atrito dinâmico&nbsp;&nbsp;&nbsp;&nbsp; N = força normal

PLANO INCLINADON= PyPx= P. sen do ânguloPy= P. cós do ângulo
POLIAS MÓVEIS Em um sistema de polias moveis, com “n” polias moveis, usa-se a fórmula&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F= P&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2n
TRABALHO DE UMA FORÇA CONSTANTE (w)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; W= F . d . cos do ângulo
Trabalho é variação de energia ou troca de energia.
W &gt; 0 ( trabalho motor): quando o corpo ganha energia ou a força favorece o deslocamento.
W = 0 ( trabalho nulo): não houve troca de energia, trabalho nulo.
W &lt; 0 (trabalho resistente): o corpo perde energia ou a força está atrapalhando o deslocamento.
ENERGIA MECÂNICA 
Energia Cinética:&nbsp;&nbsp;m . v²&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2Energia Potencial Gravitacional: m . g . h&nbsp;Energia Potencial Elástica:&nbsp;&nbsp;k . x²&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2
POTÊNCIA: &nbsp;Está relacionada a rapidez com que se realiza o trabalho.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; P =&nbsp;&nbsp;W&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;TOBS: W= P. &nbsp;deltaT&nbsp; &nbsp; &nbsp; &nbsp; deltaE= P. deltaT
ENERGIA MECÂNICA Trabalho=W=rE= EF - EI, onde W pode ser substituído por F.d.cosEnergia Cinética:&nbsp;&nbsp;m . v²&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;2Energia Potencial Gravitacional: m . g . h&nbsp;Energia Potencial Elástica:&nbsp;&nbsp;k . x²&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2
<!--[if !supportLists]-->1-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->Sistema conservativo: conserva o estado de energia ( sem atrito)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;EA=EB<!--[if !supportLists]-->2-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->Sistema não conservativo: não conserva a energia, energia é dissipada ( há atrito)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; EA≠EB&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;EA=EB+ Edis&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Edis= EA-EBTemos também :
W= EB-EAW= -(-EB+EA)W= -(EA-EB)
Ou também, W= - Edis&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;Edis= - W

IMPULSO ( I )T= F. rT&nbsp; ( para F constante)I – módulo, direção e sentido.Em um gráfico, IMPULSO é numericamente igual a&nbsp; ÁREA.
Sabemos F= m.a, então:I= m. a.&nbsp;delta&nbsp;t ; a= deltaV , logo deltaV= a. delta&nbsp;t&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; delta&nbsp;t
<!--[if !supportLists]-->1-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->Quantidade de movimento ou momento linear (P)P= m.v 
<!--[if !supportLists]-->2-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->Teorema do impulsoI= deltaP 
OBS: Impulso é a variação do momento linear.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
COLISÕES P=m.v&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;T=0I= deltaP= PF-PI &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; deltaP=0I= F. rt&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PF-PI =0, logo PF=PI &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
CONSERVAÇÃO DO MOMENTO LINEAR ( Quantidade de movimento)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mA . vA + mB . vB =&nbsp; mA’. vA’ + mB’. vB’&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (antes)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;(depois)
<!--[if !supportLists]-->1-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->Não conserva o momento linear. ( I≠0)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F. rt = m’ – m
<!--[if !supportLists]-->2-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->Conserva o momento linear .mA . vA + mB . vB =&nbsp; mA’. vA’ + mB’. vB’