7 day JR Pass or 14 day JR Pass

Hi!

I am going to visit Japan for 10 days from August 19 to 29 and I am wondering does it worth to by 14 day JRPass.

I will arrive Narita Airport on 19th of August and heading to FujiJoshida in the same evening. Can I go there with JR train?

I will stay in FujiJoshida from 19.08 to 25.08 but making twice day trips to Tokyo. Then going to Kyoto.

From August 25 to 28 I will stay in Kyoto but making one day trip to explore Nara and one day trip to see Himeneji Castle.

In the evening 28th I will go back to Tokyo and departure from Narita on 29th.

As I am going to take a lot of trips by train is it useful to buy 14 day JRPass, even if I stay shorter time?