I dunno, Ma'am, I have to agree with Supert10/Andrew. I grew up getting way too much handed to me (despite being poor, which is really odd). I'm 25 now and joining the USAF in large part to get a replacement for the tough-love parenting I never got. Don't get me wrong, I've got nothing against service, but I'd rather not have to admit that I'm joining because I disastrously unchallenged growing up.
Master a gold on one. I'd say braking, and the trick is to NOT slam on the brakes, but to gradually add more pressure to the brake button--the higher your speed, the less brakes you apply. As your speed drops, add an equivalent amount of brakes. Then just when you're thinking "won't this damn car stop?" slam your brakes and maybe E-brake for a quick halt. If you just slam the brakes (there's a big braking thread I learned this from, then applied it for 2-3 golds and much better times everywhere), your wheels will lock up and you will get less braking power from them. (You're more or less hydroplaning on a microscopic film of molten rubber--not safe at all!)
So master a gold. Show your kid how to get that gold. Let 'em know that at first you were nowhere near the gold, but each time you tried your time got a liiiittle closer. Since it's doable, and since Mum has showed them how, you now leave it in their hands. Encourage them, be confident in them, but let them do it. That's my advice. It seems a little bit uncaring--it requires the parent to assure them of the parent's confidence in them. The rush your kid'll get when they find out they actually can do something (especially something once thought impossible)... it's a great thing to witness, believe me. It's inspiring every time you see it.