Yes and no.
Done right, it involves an unbalancing move or feint. With a leg sweep, the best way is to faint or make a high attack, bringing the opponent to raise his center of gravity.
If I got hold of you, I could topple you with a feather, your large mass is actually a handicap when it comes to that.
If you want to take somebody down, with a sweep or a wristlock, like a Kote Gaeshi, you start out by faking a move in the opposite direction.
Done right, it will make the opponent try to move back from it, in effect putting his center of gravity in the direction , you want him to go.
Gary can probably say that in a more understandable way than I can, being a native English speaker.