Aula Prática 1 Propriedades dos fluidos e unidades.

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Presentation transcript:

Aula Prática 1 Propriedades dos fluidos e unidades

Mass and Force What is the mass that weights 1kg? Using Force in kg (Gravitational Units System, MKpS) one obtains the mass in this units system… The units in this system are equal or 9.8 time the SI units: On SI units system the mass is 1 kg.

É homogénea

Resolução P1.14

Resolução do problema P1.18

Resolução do problema P1.45 Zero acceleration means forces balanced. Forces are the weight and friction. For the same h, the bigger is viscosity the lower the velocity will be. But is we place oil below the block it will slip faster. Is there a contradiction? No. The oil is to increase “h”…. If h is zero, velocity is zero

Pressure Units Compute normal atmospheric pressure (760 mmHg) in bar, kg/cm2 e psi.

In psi Atm=14.69psi 1bar=14.2psi