There are two forces acting on a rocket at the moment of lift-off: Thrust pushes the rocket upwards by pushing gases downwards in the opposite direction. Weight is the force due to gravity pulling the rocket downwards towards the centre of the Earth. For every kilogram of mass, there is 9.8 newtons (N) of weight.

What forces are acting on a rocket?

In flight, a rocket is subjected to four forces; weight, thrust, and the aerodynamic forces, lift and drag. The magnitude of the weight depends on the mass of all of the parts of the rocket.

How does a rocket fly straight up?

The jet or rocket engine pushes the gases backwards, which in turn push the plane or rocket forwards. A plane is rather heavy, so it needs air streaming past it at very high speed to lift it up. ... Hence, a rocket does not need to speed along horizontally to get airborne, it just goes vertically up.