From the rocket's movement energy (formally called kinetic energy). As the rocket slows down through friction, its kinetic energy is converted mainly to heat energy.
You use fins and a nose cone on a bottle rocket because the cone reduces the drag on the rocket, and the fins help stabilize the rocket.
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The energy comes from the conversion of its kinetic energy (motion) into thermal energy (heat) due to air resistance and compression of air in front of the rocket. This intense heating is known as aerodynamic heating.
A conical rocket head is a nose cone shape at the front of a rocket. It is designed to reduce aerodynamic drag during flight and improve the overall performance and stability of the rocket. The conical shape helps to streamline the rocket and reduce air resistance as it travels through the atmosphere.
typically the nose cone is filled with a parachute to the rocket arrives on the ground safely.
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fin and tip (cone).
It streamlines the rocket and allows more speed.
"Rocket nose cone" pretty much says it all, I really don't think there is another suitable name.
A perfect cone
It streamlines the nose, so the rocket flies faster.