Why do balls spin?

When a ball bounces off a surface, it starts by sliding. Friction slows it down, so Vx decreases. The torque due to friction acts to generate spin, so w increases as Vx decreases. At low values of A the ball slides the whole time so COF = coefficient of sliding friction and Ex is negative.

Why do balls rotate?

Testicular torsion often occurs several hours after vigorous activity, after a minor injury to the testicles or while sleeping. Cold temperature or rapid growth of the testicle during puberty also might play a role.

Why do balls untwist when they bounce?

Store-bought bouncy balls are made of rubber, another material that is made up of polymers. When the bouncy ball is stretched, these polymer chains uncoil and straighten.

What is the physics of spinning ball?

The Magnus effect is a particular manifestation of Bernoulli's theorem: fluid pressure decreases at points where the speed of the fluid increases. In the case of a ball spinning through the air, the turning ball drags some of the air around with it.

What is the law of spinning?

Newton's First Law for Rotation: an object at rest tends to remain at rest, and an object that is spinning tends to spin with a constant angular velocity, unless it is acted on by a nonzero net torque or there is a change in the way the object's mass is distributed.

SPIN & SPIN AXIS - Understanding the Science of Golf (Golf Pro Training)

How is spin created in a ball?

When a ball bounces off a surface, it starts by sliding. Friction slows it down, so Vx decreases. The torque due to friction acts to generate spin, so w increases as Vx decreases. At low values of A the ball slides the whole time so COF = coefficient of sliding friction and Ex is negative.

Is testicular torsion embarrassing?

Testicular torsion usually requires immediate surgery to save the testicle. For most boys, talking seriously about their private parts can be a little embarrassing. But it's important that they know to tell a parent or a health care provider if they ever have genital pain, especially in the scrotum or testes.

Can you accidentally twist your balls?

Testicular torsion occurs when the spermatic cord twists and cuts off the blood supply to the testicle. This condition can occur at any age, but tends to be more common between the onset of puberty and the mid-20s. It requires urgent medical attention.

Is it rare for your balls to twist?

Testicular torsion is rare. It affects about one in 4,000 men and people AMAB under age 25. It's usually a spontaneous event, meaning it occurs without any apparent cause. It almost always affects only one testicle.

Why do men's balls hang unevenly?

"It's perfectly normal for one to be bigger and heavier - and that's the reason it hangs lower," says Professor David Neal, surgeon and urologist at the University of Newcastle. It's also normal for testicles to contract.

Why is my testicle hard as a rock?

Calcifications: These are small structures in the testicle or along the main sperm pipeline (vas) can become hard, almost rock like. These are always painless and rarely need to be removed.

Why are my balls darker than my body?

The development of more pigments in some areas of the skin of testicles leads to a darker appearance. This can appear as lesions such as freckles, moles, sun spots, or age spots.

What does it mean when a guy has loose balls?

The majority of the time, sagging testicles are a normal part of the aging process. The testicles naturally sag, even at a young age, to protect the sperm inside and keep them viable. Anyone worried about saggy balls or other associated symptoms should contact a doctor for a diagnosis.

What happens when your balls are full?

If your scrotum looks or feels like it's full of fluid on one or both sides, you may have a hydrocele. A hydrocele may be caused by inflammation or injury but it's not usually painful.

Why does it hurt when boys get kicked?

The testicles contain a great number of densely packed nerve endings in a small area. This high concentration of nerves makes them very sensitive and susceptible to pain. Unlike other organs, which may be internal and receive protection from muscles and bones, the testicles are external and more vulnerable to injury.

Should I call 911 if I have testicular torsion?

Testicular torsion can cause the body part to lose its blood supply, resulting in loss of the testicle. If you suspect testicular torsion or if testicular pain is accompanied by nausea, fever, chills, or blood in your urine, it's important to seek medical attention immediately.

Can I call 911 for testicular torsion?

Seek emergency care for sudden or severe testicle pain. Prompt treatment can prevent severe damage or loss of your testicle if you have testicular torsion. You also need to seek prompt medical help if you've had sudden testicle pain that goes away without treatment.

Is it normal for a 13 year olds balls to hurt?

​​​Testicular pain in teens could be a sign of testicula​r torsion. The most important thing to know about testicular torsion is that it is an emergency that must be treated immediately. But, it can be difficult for teenage boys to talk about their testicles or tell a parent if they are having pain.

What is meant by Magnus effect?

Magnus effect occurs on spinning objects that are spherical or cylindrical. The effect that we can observe is that the moving spinning object bends away from the intended direction of travel. The spin of the object alters the airflow around the body and due to the conservation of momentum it causes the Magnus effect.

Why do doctors make you cough when holding your balls?

A doctor can feel for a hernia by using his or her fingers to examine the area around the groin and testicles. The doctor may ask you to cough while pressing on or feeling the area. Sometimes, the hernia causes a bulge that the doctor can detect. If this happens, surgery almost always repairs the hernia completely.

Do some guys balls not drop?

Undescended testicles are a common childhood condition where a boy's testicles are not in their usual place in the scrotum. It's estimated about 1 in every 25 boys are born with undescended testicles.

Do guys balls hang lower than the other?

Most men's testicles are about the same size, but it's common for one to be slightly bigger than the other. It's also common for one testicle to hang lower than the other. The testicles should feel smooth, without any lumps or bumps, and firm but not hard.

Why do some guys balls look different?

Most males have one testicle that is smaller than the other, a testicle that hangs lower than the other, or both. Certain issues and health conditions, such as testicular cancer, can cause changes in the size and shape of the testicles.

What happens if a testicle dies?

The testicle will shrink ("atrophy") if the blood supply isn't restored within 6 hours. With no blood, the testicle could die (or "infarct"). When the testes die, the scrotum will be very tender, red, and swollen. Often the patient won't be able to get comfortable.