Knee Injury, I was hit hard!?

I was working out at my school's gym for p.e. (we had to) and I got to this particular station http://hawkspe.com/Fitness_Center/fitnes... and I couldn't lift it so I went to the front and pulled, sat down again and tried again to lift, when I did I couldn;t hold it and the heavy metal piece cam down hard directly on my knee cap! Ouch! It hurt so bad, my eyes filled with tears and it turned bright red, a lump appeared in my knee about an hour later. MY SYMPTOMS: I cannot lift my leg up, sometimes my knee gives away when walking, It gives a painful twinge sometimes and I can barely walk on it, It is no longer red though, just a lump. My mom thinks I should just walk on it and it'll be fine, she doesn't think it's really hurt. What kind of injury do you think this is and what should I do about it?

I am in a lot of pain!

sounds like you have a nasty bruise, if it gets worse or the swelling gets bigger get it looked at.

sounds like a bruise, a bad one at that. do the RICE method.
R-rest
I-Ice, it'll relieve the pain and it'll also keep the swelling down. I'd also go out and buy Icy Hot and rub it on your knee before you run.
C- compression wrap the bag of ice around your knee
E- elivate prop it up.
If it hurts tomrrow worse i'd go to the doctor.
From the beginning of your injury your put two much on the bar. VERY DANGEROUS ok

Does your kneecap look like it's in the right place. I hit my knee on something pretty hard and it dislocated my kneecap and I couldnt walk and there was no real swelling or anything like that. I would go get it checked out asap..you need your knee to walk. I didn't get mine checked out soon enough and it still gives me problems. Knees can be pretty fragile. Also it might of chipped some cartildge, which hurts a lot too.

It sounds like a problem to me! If you have any crutches walk on those until you can see a doctor! Knee pains can cause a lot of problems