It is the latest in a string of recent U.S. shootings that occurred for apparently trivial reasons, including the wounding of a Black teenage honors student in Missouri who went to the wrong address to pick up his younger brothers, the killing of a woman who was in a car that pulled into the wrong upstate New York driveway, and the wounding of two Texas cheerleaders after one apparently mistakenly got into a car that she thought was her own.

I was looking through pictures of the kids for a back-to-school project, and ran across this shot of SteelyKid, age 8, taking a shot in a Bankshot game. This is a variant of basketball using weird backboards where you have to bank the ball off one or more boards before it goes into the basket. She actually did better than I did at making some of the trickier shots, not so much in spite of the fact that I've been playing basketball for several times her age, but because of it. I kept reflexively treating these like real basketball shots, where she simply threw the ball at the board as hard as she could, and that turned out to be a better strategy for this particular game.


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So, what's the difference? Well, players learning to take a jump shot in basketball are taught from a very early age to "follow through" at the end of the shot, ending the shooting motion with a downward flick of the wrist, sort of like a wave. SteelyKid's five-year-old brother, The Pip, was being told this when he could barely throw the ball to the rim using both hands. The end result of this is to put a bit of backspin on the ball, which not only makes for gorgeous slow-motion images in sports replays or basketball movies but also gives the shot a better chance of bouncing in.

This isn't a Magnus Effect thing like curving shots in soccer, but a matter of friction when the ball hits a surface. When a ball strikes a surface, you can break the process into two separate problems: one involving the motion straight into the surface, the other the motion parallel to the surface.

Regardless of how the ball is thrown, the result of the into-the-surface problem is the same: the ball comes straight in, and bounces straight back out with almost the same speed. The only forces involved in this case are "normal" forces resulting from compression of the surface, and those can only act perpendicular to the surface. (This is the origin of the name-- contrary to what many intro physics students think, these aren't "normal" because they're normally present, but because in math jargon a line perpendicular to a planar surface is said to be "normal to the plane.")

In the case of a ball thrown without spin, the effect of friction is pretty minimal. During the brief time that the ball and the surface are in contact, there's not much relative motion between them, so nothing much happens. The parallel-the surface part of the ball's motion is unchanged, and it bounces off the floor at more or less the angle it came in.

For a spinning ball, however, friction makes a bigger difference. As the bottom of the ball comes in contact with the surface, it's trying to slide across that surface in the direction of the ball's motion, and friction is trying to resist that motion. A good basketball has a bit of grip to it, so it doesn't slide very easily, and the friction force can be substantial. Since the attempted slide is in the same direction the ball is moving, the friction force is in the opposite direction and makes the ball slow down.

You can demonstrate this pretty easily by taking a basketball and throwing it a short distance in front of you with and without spin. Without spin, the ball will bounce off the floor and continue moving away from you, but if you give the ball a significant amount of backspin as you let it go, you can make it stop, or even come back toward you.

(Why does this depend on the rate of spin, though, since in the simplest model of friction the force doesn't depend on the velocity between the surfaces? I think the way to picture this is to imagine the extreme case where the friction force succeeds in keeping the tiny piece of the ball in contact with the surface from sliding. In the no-spin case this doesn't make much difference, but for a ball that's trying to rotate in the direction of motion, this leads to some compression of the ball behind the contact point, which leads to an elastic force in the backward direction. The faster the spin, the greater the compression, and the bigger the force. But this is a quick off-the-top-of-my-head attempt to explain this, and I could be wrong...)

The spin is most important for a jump shot from a longer distance, where the horizontal velocity is pretty substantial. A ball coming in without spin that hits the front of the rim and bounces will continue on at high speed and hit the backboard at high speed, and most likely bounce back out over the front of the rim, with no chance to fall through-- a "brick." A shot with backspin, on the other hand, will slow down a bit as it hits the rim, and thus hit the backboard at a slower speed. This gives means it will bounce back more slowly, as well, and probably won't clear the front of the rim again on the way back out; it might go straight in, or it might bounce off the front of the rim again, but in either case it's got a second chance to go in that the no-spin shot doesn't.

A shot with the opposite sort of spin will tend to roll forward as it hits a surface, which is another thing basketball players are taught to do, in a different context. When taking a lay-up from short range, players are taught to let the ball roll off their hands toward the rim (as you can see in the game photo above), giving the ball forward spin. Unlike the jump shot, which is coming in fast and needs to slow down to go in, a lay-up is coming in slow, and you want it to roll forward and into the basket.

So, returning to the cute-kid example that started all this, the reason SteelyKid was better at some of the Bankshot games than I was is that thanks to thirty-mumble years playing basketball, I reflexively shoot the ball with backspin on it. Which is great if you want to hit a single rim and a single backboard, then drop in. If you're trying to do a double-bank, though, where the ball needs to hit multiple boards before going in, the loss of speed that comes from the spin is deadly. you're much better off doing what she was doing, and just throwing the ball hard at the board and hoping you've got the angle right.

Nine people were shot and wounded near the Denver Nuggets' Ball Arena early Tuesday morning in an apparent drug deal as celebrations for the team's first NBA championship were winding down, police said. One of two men who were arrested in connection with the shooting also sustained a gunshot wound, police disclosed.

According to police, the shooting happened in the vicinity of the arena where the Nuggets won their first NBA championship Monday night with a hard-fought 94-89 victory over the Miami Heat in Game 5 of the NBA Finals.

CBS Colorado reported that thousands of celebrating fans had poured into the streets around the arena after the game. Police spokesperson Doug Schepman told CBS News the shooting happened roughly three-and-a-half hours after the game, in the area where the biggest crowd of fans had gathered, though there was a smaller crowd when the gunfire broke out.

I'm new to THREE.js and with a very poor knowledge in physics but still I want to make a football manager game (played from top view) and I need to know that the kick of the ball is realistic as possible.

In the first part of the workout, we do a ball handling warm up for a couple of minutes. These drills are done for a combination of reasons including...Warm up the body.

Wake up the nerves in your hands and arms to dribble, shoot, and pass better.

Motivate the athlete with variety.

Overload the athlete so game-like ball handling feels easy and you can dribble without thinking.

Description

Bend your knees and dribble to basketball from front to back, on the left side of your body. Next, dribble the ball once in front of your body before returning to the front to back dribble. Dribble exclusively with your left hand.

Description

Bend your knees and dribble to basketball from front to back, on the right side of your body. Next, dribble the ball once in front of your body before returning to the front to back dribble. Dribble exclusively with your right hand.

Description

Bend your knees and dribble two basketballs at once. Dribble the ball in your right hand high enough to be able to quickly dribble the other ball through your legs from your left hand to your right hand back to your left hand.

Description

Bend your knees and dribble two basketballs at once. Dribble the ball in your left hand high enough to be able to quickly dribble the other ball through your legs from your right hand to your left hand back to your right hand.

You may also notice that the shooters are very deliberate with some of their motions, like getting the ball to shooting position, pausing for a fraction of the second to look at the hoop, then executing their footwork counters. This is done to ingrain good habits and skills as it is easy to speed up and get sloppy.

Points of Emphasis

- Keep your knees bent as you pivot.

- Make sure you quickly get your feet in shooting position. They should be in the same balance position each time you shoot. Reps will help with this.

Description

Spin the ball (simulating a pass) on the wing. Jump stop, catch the ball, front pivot, step through and shoot. Your left foot is the pivot foot and should stay in contact with the ground. 17dc91bb1f

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