MCQ : The rocket engines lift a rocket from the Earth because hot gases with high velocity

Question

The rocket engines lift a rocket from the Earth because hot gases with high velocity

1. push it against the Earth
2. push is against the air
3. react against the rocket and push it up
4. heat up the air which lifts the rocket

Answer

react against the rocket and push it up

Explanation

The rocket engines lift a rocket from the Earth because hot gases with high velocity react against the rocket and push it up. According to Newton’s third law of motion, every action has an equal and opposite reaction. The rocket engines expel hot gases with high velocity in the opposite direction of the desired motion of the rocket. As a result, the rocket experiences a reaction force in the opposite direction, which propels it upwards.