# Questions tagged [sports]

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34 questions
24 views

### Calculating energy capacity of a battery

I understand that you can easily calculate the energy capacity of a battery simply by multiplying the mAh rating by the Voltage. However, my question is how do the manufacturers calculate the mAh ...
34 views

### What makes a skier turn when weight is applied on the front-inner side of the outer ski?

A downhill skier is on the slope indicated by the arrows (arrow head indicating the direction of the incline). The skier has nearly reached the left edge and wishes to turn. The skier is heading, ...
56 views

### How can a player hit a home run with a broken bat?

Although they're rare, I've seen a few instances where a baseball player breaks their bat and still manages to hit a home run. Two examples: Chris Davis from the Orioles did it in 2012 (https://www....
16k views

### When you hit a baseball, does the ball ever travel faster than the bat?

It seems impossible, yet I'm thinking that maybe because the ball compresses against the bat a bit it acts a little like a spring, and DOES travel faster than the bat? EDIT: This is just a ...
58 views

### Disintegration of the rapidly rotating figure skater

Following recent news "Spectators Bombarded With Gamma Radiation As Rapidly Spinning Figure Skater Collapses Into Singularity" (Onion), I was wondering, are there any special effects that will occur ...
144 views

### Advantage of a deflated NFL football [closed]

In the infamous "Deflatagate Scandal", Tom Brady, quarterback of the New England Patriots, was accused of deflating his footballs and served a suspension for doing so. Why is a deflated NFL football ...
324 views

### How do figure skaters get angular momentum for a spin?

It’s no use asking skaters how they get the angular momentum for a spin. They don’t understand the distinction between angular momentum and velocity, and many are under the illusion that pulling in ...
288 views

### Negative Magnus effect?

Supposedly, the Magnus effect, which is responsible for the curve of a curveball, and is the reason that tennis players hit their ground strokes with topspin, only acts above a critical Reynolds ...
251 views

### How to hit a baseball or softball further?

I have this idea. Would wearing a weighted backpack help a batter hit a baseball or a softball further? I thought of this because I can accurately hit baseballs and softballs but my problem is that I ...
278 views

### Rotational motion activity for physics of sports class

I'm looking for a really solid rotational motion lab for a physics of sports class I'm teaching for younger students (HS Freshmen mainly). It should be something that the students can gather data ...
3k views

### A cricketer catches ball

A seasoned cricketer catches a cricket ball coming in with great speed,he draws his hand backward in act of catching the ball. How can I explain this phenomena in terms of impulse? In my text book ...
402 views

### Why are ski jumpers slim?

Assuming perfect technique and material, how does the mass of a ski jumper affect the performance? The higher potential energy of heavier jumpers could favour heavier jumpers, but then also friction ...
596 views

### Center of gravity of Athletes [closed]

Can someone please give me a clear explanation for the (b) Part of this question. Not the (a) Part of it. Also, Explain the importance of center of mass in deciding which type of jump is better.
151 views

### Percolation in Ultimate Frisbee (and Rugby, American Football, Basketball etc)

Question Has anyone ever investigated weather game dynamics in certain sports ever experiences a percolation-type transition with catching probability as the driver? Details I recently started ...
309 views

### Would I be able to jump higher at the top of a skyscraper because there is less gravity?

Would I be able to jump noticeably higher at the top of a skyscraper because there is less gravity? At the top of the Burj Khalifa? Does anyone have a video or something of someone testing this? I ...
333 views

### Spinning cricket balls and weight distribution

An article on ESPN Cricinfo discusses the possibility of the internal weight distribution of cricket balls having an impact on the ability of a bowler to achieve 'spin'. In cricket, a spin bowler ...
804 views

### High jump vs. gymnastics floor routine center of mass

Olympics are going on now so: The gymnists doing floor routines do some very high jumps after somersaulting a few times. High jumpers also jump very high using the Fosbury flop technique. Question: ...
129 views

### Maximum possible acceleration value on a ball in volleyball game

I have been examining this subject on web but could found enough information yet. I have to make a decision on choosing "range" for accelerometer which will measure acceleration value of ball in ...
116 views

### Does a man run a same distance with different velocities spend the similar energy?

To simplify the question we assume the same man run on a straight and flat road with constant speed. Personally I don't believe the man would spend a similar energy. But how to prove it in physics? I ...
433 views

### Why do throwing knives need to be balanced?

Indeed, unbalanced throwing knives are used, but I have read that balanced throwing knives are easier to use, because due to their geometric center being the same as their center of mass. Why would ...
416 views

### Why is acceleration significant to generating power in racket sports?

I'm reading a paper on badminton stroke power (see Figure 4 on page 8). It says: For most of the trials the racket head reached peak speed just at the time of impact. The racket head showed great ...
1k views

### How does angular momentum affect the trajectory of a projectile?

I am thinking about a football thrown in a very tight, very fast spinning spiral. If the football is thrown upwards at a high angle, is it possible for the football to not turn over at the top of its ...
2k views

### Efficiency of Bicycle Pedalling

Consider a bicycle with multiple gears. Suppose that you are in a starting position with someone holding your bike upright (so when you start there's no issue with clipping in etc). It's well-known (...
264 views

### Golf: spin direction resulting from striking out of the toe

If a golf club strikes the ball out of the centre of the club face with the club path on the target line through impact, and the face square to target, the ball will move towards the target with no ...
152 views

### How does a “hammer thrower” that we see in the Olympics, impart so much momentum

How does a "hammer thrower" that we see in the Olympics, build so much momentum into the club? It's sort of like the golf swing, the more momentum, primarily in the club head, the further the ball ...
9k views

### How do they measure the rotational speed of cricket balls?

The 2013 Ashes series (a cricket thing between England and Australia) are underway as of today and it seems they have a new (to me) gimmick. It appears that they are now able to measure almost ...
4k views

### In tennis, why does topspin serve bounce higher than flat serve?

When receiving servers (while playing tennis), I've noticed that the tennis ball seems to bounce up higher on me when the server uses a topspin serve than when the server hits a flat serve. Why is ...
17k views

### What makes running so much less energy-efficient than bicycling?

Most people can ride 10 km on their bike. However, running 10 km is a lot harder to do. Why? According to the law of conservation of energy, bicycling should be more intensive because you have to ...
10k views

### Why is ski jumping not suicidal?

At least on television, ski jumpers seem to fall great vertical distances before they hit the ground - at least a few dozen meters, though I couldn't find exact distances via a quick search. And yet ...
2k views

### “Relativistic Baseball”

On Randall Munroe’s new blog “what if”, he answers the question: “What would happen if you tried to hit a baseball pitched at 90% the speed of light?” http://what-if.xkcd.com/1/ He concludes: …...
3k views

### How many Gs would a driver of the Bugatti Veyron experience on the Ehra-Lessien track when cornering before record attempt?

Apologies if too specific. Watched a documentary National Geographic Megafactories Bugatti Veyron I told an colleague (engineer) about the need to warm the car up and then unleash it on the long ...
9k views

### Physics of a skateboard ollie

Does anyone have a good explanation of the physics and vectors of force involved in the skateboarding trick the ollie (where the skater jumps and causes the skateboard to rise off the ground with him)...
Okay, some textbooks I came across, and a homework assignment I had to do several years ago, suggested that the reason we can skate on ice is the peculiar $p(T)$-curve of the ice-water boundary. The ...