Barrel Rolling on concrete reverses its direction of motion

While reading my textbook I came across an activity which told :

Try rolling a barrel from concrete onto grass, what happens does the barrell reverses its direction of motion ? Is this because of greater resistance offered by grass ?

And then later it answers :

rolling barrel from concrete onto grass reverses its direction of motion as grass offers greater resistance.

Now as said I did the activity but nothing like reversing of direction was observed by me , on contrary the barrel stopped.

I can't understand how direction of motion would reverse on I believe that due to friction barrel slows down but that contradicts what's written , where I am going wrong ?

• Was there a diagram in your book? The barrel rolling analogy is sometimes used to explain refraction. books.google.co.uk/… – Farcher May 10 '17 at 5:06
• @Farcher , no ; there wasn't any diagram, although looking at the link you provided I understood that barrel changes direction but how come it "reverses" its direction of motion ? – Physicsapproval May 10 '17 at 5:14
• That doesn't sound right to me either. I can't say I've ever seen grass that is springy enough to make a rolling barrel reverse course. – JMac May 10 '17 at 11:05
• I did the activity again and this time I noticed something that there was a litte bit backward motion after it stopped very quickly but I am not able to feel that even , can it seen mathematically ? assuming resistance due to grass larger than concrete , can it be proved ? – Physicsapproval May 10 '17 at 11:09
• -1. What text? If you quote from a source, you ought to identify it so that we can judge how reliable it is. It does not sound reliable. – sammy gerbil May 12 '17 at 0:58