Suppose an object is moving in a straight line at 50 mi/hr. According to Newton's first law of motion, the object will
A) continue to move in the same way forever, no matter what happens.
B) continue to move in the same way until it is acted upon by a force.
C) eventually slow down and come to a stop.
D) continue to move in a straight line forever if it is in space, but fall to the ground if it is on Earth.

Question

Quizplus · Accepted Answer

Newton's first law of motion, also known as the law of inertia, states that an object will remain in its current state of motion (i.e., at rest or moving at a constant velocity) unless acted upon by an external force. In this case, the object is already moving at a constant velocity, but if a force (such as friction or air resistance) were to act upon it, its motion would change. Therefore, the correct answer is choice B.

Suppose an Object Is Moving in a Straight Line at 50