You can't tackle a player that doesn't have the ball in his possession. You can block any player you want -- you can even knock someone over with a pancake block -- but grabbing onto a player who doesn't have the ball and taking him to the ground would constitute holding.
Not sure exactly what you're asking, but yes, you can knock a runner over by tripping into them. All it really takes is a hard shove, because a runner's feet rarely touch the ground at the same time.
Yes. NFHS Rule 9-2-5c. A player shall not clip except to tackle a runner or player pretending to be a runner.
No. Tripping by a blocker for the ball carrier or by a defender trying to tackle the ball carrier is illegal and is a 10 yard penalty.
It is legal to trip the ballcarrier. Rulebook definition: Tripping is the use of the lower leg or foot to obstruct an opponent, who is not the runner (ballcarrier), below the knee. If tripping occurs on an opponent other than the runner it is a 15 yard penalty.
When I played football, our coach taught us that we always watch the runner's (or qb's) hips, because that gives away what direction he'll run. Don't look at his legs, it will confuse you; look at the hips. Then you lean in that direction to make your tackle. So, you watch the runner's hips and lean that direction to tackle him.
Suppose a runner covers a distance of 5322 feet in a 6 minutes and 11,531 feet in 13 minutes. So how much distance does the runner cover in 16 minutes?
No. With minor exceptions (e.g. a fielder with the ball can tag "out" a runner) baseball is NOT a contact sport. A catcher holding the ball and blocking off home plate CAN legally be barreled over by a runner attempting to score by knocking the ball out of the catchers hands but other than that, no there is no tackling in baseball.
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yes
Nerves in your feet relay information about the position of the joints and also about the surface upon which you are walking. If this impaired the balance will be off and you will be subject to tripping.
What to do while tripping
In the NFL, a horse collar tackle is when a defender grabs the inside collar of the back or side of the shoulder pads or jersey of the runner and immediately pulls them down. This is considered a dangerous tackle and is penalized with a 15-yard penalty. It is meant to protect players from potential injuries to the neck and spine.