Mass and thrust are very important values of a rocket. If mass and thrust are divided then you will get the thrust-to-weight ratio.
Mass[]
Mass are numbers that calculate how heavy is the rocket. Too much mass will lead to your rocket not leaving the ground. To avoid this lower the mass of the rocket, adding more thrust or changing the fuel level in fuel tanks.
Thrust[]
Thrust is a number that calculates the horsepower of the rocket. More thrust means more power. Thrust is important but too much thrust can lead to your rocket getting burned due to the aerodynamic drag acting against the speed of the rocket so try to throttle down if the rocket has a high thrust.
Thrust-to-weight ratio[]
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As stated earlier, dividing the mass and thrust will have its quotient be the thrust-to-weight ratio. It will tell if the rocket can lift off of a celestial body or not. If the TWR is higher than 1, then it would lift off of the ground; if it's below 1, then it wouldn't loft off of the ground. A TWR of 1.3–1.5 is best.