Provide newton's first law of motion and explain why it is important to consider this law in rocket design.

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. It is also known as law of inertia.

If an object such as a rocket, is at rest then the forces on it are balanced. If the object is moving, it takes an unbalanced force and to stop it, we should change its direction from a straight line path or increase or decrease its speed. In rocket flight, forces become balanced and unbalanced almost all the time. So, it's very important to apply the law of inertia of newton's 1st law of motion into a count while working with rockets, or making one.

d) physical means can be used to separate the components of air.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.