How many forces need to be applied to a body in space to keep it moving with a constant velocity?
A) one force, in the direction of motion
B) none
C) two unequal forces
D) one force, in a direction opposite to the direction of motion

Question

Quizplus · Accepted Answer

According to Newton's first law of motion, an object in motion will stay in motion with the same speed and in the same direction unless acted upon by an unbalanced external force. Therefore, if a body is moving in space away from significant gravitational fields and other forces, no additional forces are needed to keep it moving with a constant velocity.

How Many Forces Need to Be Applied to a Body