He is protecting his ewes and lambs. Is it possible to keep him separately but with a wether companion?
Not to be indelicate, but sheep are well aware that human females are female, and it is better to stay away from them at certain times of the month. Your ram may well want to include your daughters in his harem so will be trying to round them up. You however are a competing male so unless you show your dominance now you are in for a battered time.
People try various ways to show dominance over their livestock with various degrees of success. One which does not work is to whack your ram's head, because he will see that as fighting so will get back at you. The drawing back is indeed to get a better run at you, and when two horned rams meet after a long run-up it's cringeworthy and one or even both can be killed. The crack when they meet is loud
A very important rule when dealing with rams is NEVER to turn your back on them no matter how docile and cuddly they are. The worst are those which have been the friendliest and cutest as lambs
For your daughters feeding the sheep, it is best for them not to go into the field, but to have a trough near an edge so they can lean over the fence and pour the food in from there. Or you could build an 'air lock' of hurdles just inside the gate, then have the trough by that and pour the food over.
But really it's best to keep your ram away from the ewes other than at tupping time, but to give him a wether companion.