Atenção! Esta questão foi postada ha mais de 30 dias!
Exercício de Questão MAC-SP Força Resultante
Exercício:
(MACK – SP) Sobre uma superfície plana, horizontal e
sem atrito, encontra-se apoiado um corpo de massa 2,0
kg, sujeito à ação das forças F1 e F2. As intensidades de
F1 e F2 são, respectivamente, 8 N e 6 N. A aceleração
com que esse corpo se movimenta é:
a) 1 m/s2 c) 3 m/s2 e) 5 m/s2
b) 2 m/s2 d) 4 m/s2
Eu sei que a resposta certa é a E mas, não sei como resolver, não deu pra colar a figura aqui, mas nesse site tem é a questão 6 http://blog.clickgratis.com.br/fisicado/32444/Leis+de+Newton.html
Ah!!! Galera se alguem souber onde encontro algum material explicando esse assunto posta o link, pode ser qualquer coisa apostila, site, forum, video-aula.
;D
As forças estão num ângulo de 90º.
Aplicando o teorema de pitágoras para achar a resultante, temos que F=10N.
Mas a força resultante é igual ao produto da massa pela aceleração. Então temos:
F=ma
10=2a
a=5m/s2
F1=forças 1//F2=forças 2 = Newton= 6N e 8N
a= ?
M=massa do corpo= 2kg
F1+F2=m.a
8+2=2.a
10=2a
a=5 m/s²
A aceleração é igual a 5m/s².
Espero que tenha ajudado ^^
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