Are there differences between the 2 and what are they if they are not
interchangeable?

りき入ってんじゃん. For this sentence "(He) sure is putting power into it.", could
chikara be used instead? E.g. ちから入ってんじゃん.
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2017-12-21T08:53:36.590
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2017-12-21T13:42:52.933
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question
meaning word-choice kanji nuances
りき vs ちから for 力
ちからが入る is a very common set phrase, which can mean both "(for a muscle) to
physically strain (under pressure, etc)" and "to put much effort on
something".

>   * (while practicing tennis) 肩の筋肉に力【ちから】が入ってしまっている。もっと力を抜いて、リラックスしてプレイしなさい。
>   * 締切が近いので、彼は仕事に力【ちから】が入っている。
>

リキが入る is a fairly uncommon and slangy expression. From what I understand, it
usually means "to put much effort on something" or "to do something
seriously". I may be wrong, and others may use it differently. I never use
this phrase, but maybe so-called 体育会系 people tend to use this more often.

>   * おお、仕事にリキ入ってんじゃん。
>

If there is no furigana, you can read it as ちから.
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2017-12-21T10:03:59.940
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2017-12-21T11:52:28.483
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answer