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Exercício de Leis de Newton - calcular a intensidade da força média
por Agnes (exercício do livro de física - Iva Gonçalves dos Anjos, 2ª edição de 2005)
Fácil Thursday, July 1st, 2010
Exercício:
Um automóvel com velocidade de 20 m/s é freado quando o motorista vê um obstáculo. O carro é arrastado por 40 metros até parar. Se a massa do carro é de 1000 kg, qual a intensidade da força média que atuou no automóvel durante a freada?
espaço=40m
V=20m/s
m=1000kg
Fr=?
V²=Vo²+2a40
400=0+2a40
a=5m/s²
Fr=m.a
Fr=1000.5
Fr=5000N
A aceleração num seria de -5m/s² porque o carro teve uma desaceleração?
V²= Vo² + 2.a.?S ;
A velocidade final é 0m/s porque o carro parou e a velocidade inicial é 20m/s.
0² = 20² + 2 a 40 —} a = – 5m/s²
Um automóvel de massa m =1200 kg , com velocidade v0=30 m/s , bate num poste e atinge o repouso. Supondo que a colisão tenha demorado Delta t =0,2 s ,calcule a intensidade da força média exercida pelo poste sobre o automóvel durante a colisão.
Uma partícula de massa m= 1,0 kg possui, num certo instante, velocidade v de módulo v= 2,0 m/s, direção vertical e sentido ascendente. Determine o módulo, a direção e o sentido da quantidade de movimento apresentados pela partícula no instante considerado.
5 forcas atuam na mesma direção com os sentidos e as intensiadades a seguir: 3 forças para esquerda 27 n 54 n 63 n 2 forças para direita 45n e 120 n. calcule a intensidade ao resultante desses sistemas de forças e indique os sentidos dela.
n : newton
em quanto tempo (dias) um objeto lancado no rio percorre 1000km/h com uma velocidade constante de 20m/s?
um corpo de massa 4,0 encontra-se em repouso inicialmente e submetido a ação de uma força cuja a intendidade e igual a 60 n . Calcule o valor da aceleração adiquirida pelo corpo
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