DICAS DE VESTIBULAR E CONCURSO COM O PROFESSOR ANDERSON ALVES
Ola amigos !
Hoje a dica entrará na parte da física que estuda os movimentos . Estou falando da cinemática . Começaremos pelo movimento retilíneo e uniforme . Por definição é todo movimento em que a velocidade permanece constante. Vejamos alguns exemplos:
O gráfico a seguir representa a função horária do espaço de um móvel em trajetória retilínea e em movimento uniforme.
Com base nele, determine a velocidade e a função horária do espaço deste móvel.
Com base nele, determine a velocidade e a função horária do espaço deste móvel.
v = Δs/Δt
v = (250 – 50)/(10 – 0)
v = 200/10
v = 20m/s = velocidade
x = xo+ v.t
x = 50 + 20.t
v = (250 – 50)/(10 – 0)
v = 200/10
v = 20m/s = velocidade
x = xo+ v.t
x = 50 + 20.t
Obs: Cuidado com o tipo de gráfico.O gráfico (VxT) é que representa uma reta paralela ao eixo de X.
2) A função horária do espaço de um carro em movimento retilíneo uniforme é dada pela seguinte expressão: x = 100 + 8.t. Determine em que instante esse móvel passará pela posição 260m.
X = Xo + V t X- Espaço final , Xo = Espaço inicial , V = Velocidade e T= Tempo.( Equação Horária )
x = 100 + 8.t
260 = 100 + 8.t
8.t = 160
t = 160/8
t = 20s
260 = 100 + 8.t
8.t = 160
t = 160/8
t = 20s
Anderson Alves.
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