In order for a moving object to remain in motion
A) there must be a frictional force acting on it
B) there must be a gravitational force acting on it
C) there must be a NET force acting on it
D)there must be a force acting on it
E) none of these is true
I thought that it would've had to be C because newton's 1st law states that an action remains in motion unless acted upon by a net external force. Or is it because it doesn't say external that none have to be true?
correct. There must be no net force acting
wait. so the answer is none of them are true?
The correct answer is C) there must be a NET force acting on it.
Newton's first law of motion, also known as the law of inertia, states that an object at rest will stay at rest, and an object in motion will continue to move at a constant velocity unless acted upon by a net external force. This means that if the object is not subject to any net force, it will continue to move with a constant velocity or remain at rest if it was initially at rest.
In the given options, A) there must be a frictional force acting on it, B) there must be a gravitational force acting on it, and D) there must be a force acting on it are not always true for an object to remain in motion. Frictional force and gravitational force can both act against the motion of the object, causing it to slow down or stop. However, if the object is experiencing a net force, which can be the result of various forces acting on it, it will continue to move.
So, in summary, for a moving object to remain in motion, there must be a net force acting on it, as stated by Newton's first law of motion.