Mine craft is crashing.help?

So I got a MacBook for Christmas and it s a MacBook Pro. I downloaded minecraft on it (1.7.10). I also started downloading mods on if to,everything was fine until I downloaded a few mods and it crashed. Then I took those mods out and switched to 1.8. Then I switched back to 1.7.10 and decided I was just gonna stay with that Version. I downloaded Mr crayfishes frunuture mod and carpenters blocks mods, it crashed. The first time I was on 1.7.10 it was totally fine, downloaded it with no problems. What could be causing this? Please help!

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