Question

A plane is moving at a constant velocity.

That means
A. there is no net force on the plane.
B. there is a net upward force on the plane.
C. there is a net backward force on the plane.
D. there is a net forward force on the plane.

Answer 1

A plane moving at a constant velocity signifies that there is no net force on it, in accordance with Newton's first law of motion. This law also explains the sensations we feel during airplane takeoff or tight turns in a car due to inertial effects. The correct option is A. there is no net force on the plane.

Step-by-step explanation:

If a plane is moving at a constant velocity, it means that there is no net force acting on the plane because the forces are balanced as per Newton's first law of motion. This also applies to any object moving at a constant velocity, which indicates that the net force acting on it is zero. In the case of the question, the correct answer is A: there is no net force on the plane.

When relating this to other scenarios, in uniform circular motion, there is actually a net force acting on the object because it is constantly changing direction, which means there is acceleration towards the center of the circle. Such a force is called a centripetal force.

Furthermore, the feeling of being pushed back in a seat during airplane takeoff is not due to a real force pushing us backward but is related to Newton's laws, as our bodies tend to resist the change in motion due to inertia, while the seat pushes forward on us, causing acceleration.