If no external forces act on a moving object, it will? a) move slower and slower until it finally stops. b) come to an abrupt halt. c) continue moving at the same speed. d) none of the above

3 Answers
Mar 16, 2018

(c) The object will ontinue moving at the same speed. This is brought out by Newton's first law of motion.

Mar 16, 2018

C

Explanation:

Newton's second law says that #F=(mDeltav)/t#, where:
#F# = resultant force (#N#)
#m# = mass (#kg#)
#Deltav# = change in velocity (#ms^-1#)
#t# = time (#s#)

If #F=0#, then #Deltav=0# (#m# can equal 0, but this isn't part of the question).

When #Deltav=0# it means that the object is travelling at a constant velocity. If its velocity was changing then it would be accelerating. Since it isn't accelerating, it will stay at the same speed.

Mar 16, 2018

(c)

Explanation:

Statement of Newton's First Law of motion.