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Related Concept Videos

Mass and Weight01:19

Mass and Weight

Mass and weight are often used interchangeably in everyday conversation. For example,  medical records often show our weight in kilograms, but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of the Earth on an object. It depends on the distance from the center of the Earth. Weight dramatically varies if we leave the Earth's surface, unlike mass, which does not vary with location. On the Moon, for example, the acceleration due to...
Mass and Weight01:19

Mass and Weight

Mass and weight are often used interchangeably in everyday conversation. For example,  medical records often show our weight in kilograms, but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of the Earth on an object. It depends on the distance from the center of the Earth. Weight dramatically varies if we leave the Earth's surface, unlike mass, which does not vary with location. On the Moon, for example, the acceleration due to...
Rigid Body Equilibrium Problems - II01:21

Rigid Body Equilibrium Problems - II

A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
Apparent Weight01:09

Apparent Weight

True weight is the measure of the gravitational force acting on an object. However, if the object accelerates, its measured weight is different from its true weight. Similar observations can be made when the object is submerged in water. An object's weight in water is its apparent weight, which is equal to the difference between its true weight and the buoyant forces.
Consider a person standing on a bathroom scale inside an elevator. If the scale is accurate at rest, its reading equals the...
Weightlessness01:01

Weightlessness

When an object is dropped, it accelerates toward the center of the Earth. If the net external force on the object is its weight, it is said to be in free fall; that is, the only force acting on the object is gravity. Galileo was instrumental in showing that, in the absence of air resistance, all objects fall with the same acceleration g. However, when objects on the Earth fall downward, they are never truly in free fall, because there is always some upward resistance force from the air acting...
Testing a Claim about Standard Deviation01:19

Testing a Claim about Standard Deviation

A complete procedure to test a claim about population standard deviation or population variance is explained here.
The hypothesis testing for the claim of population standard deviation (or variance) requires the data and samples to be random and unbiased. The population distribution also must be normal. There is no specific requirement on the sample size as the estimation is based on the chi-square distribution.
As a first step, the hypothesis (null and alternative) concerning the claim about...

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Modified Drop Tower Impact Tests for American Football Helmets
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Certifying wrestlers' minimum weight: a new requirement.

W O Roberts1

  • 1MinnHealth SportsCare, White Bear Lake, MN, 55110, USA.

The Physician and Sportsmedicine
|January 21, 2010
PubMed
Summary
This summary is machine-generated.

Wrestlers cut weight for competitive advantage, but extreme methods are dangerous. Unhealthy weight loss practices have tragically led to athlete deaths.

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Area of Science:

  • Sports Medicine
  • Exercise Physiology
  • Adolescent Health

Background:

  • Athletes in weight-class sports, like wrestling, frequently engage in weight cutting.
  • This practice aims to gain a competitive advantage by competing in a lower weight class.
  • Concerns exist regarding the safety and health implications of extreme weight cutting methods.

Purpose of the Study:

  • To highlight the dangerous practices associated with "weight cutting" in high school and college wrestling.
  • To underscore the severe health risks, including fatalities, linked to extreme weight loss methods.
  • To raise awareness among athletes, coaches, and parents about the dangers of unhealthy weight cutting.

Main Methods:

  • Review of existing literature on weight cutting practices in wrestling.
  • Analysis of reported cases and health consequences associated with extreme weight loss.
  • Examination of the physiological impact of rapid weight reduction on adolescent and college athletes.

Main Results:

  • Weight cutting is prevalent among high school and college wrestlers.
  • Unhealthy and extreme weight loss practices are commonly employed.
  • Tragic outcomes, including multiple athlete deaths, have resulted from these practices.

Conclusions:

  • Extreme weight cutting poses significant health risks to wrestlers.
  • The pursuit of competitive advantage through unhealthy weight loss can have fatal consequences.
  • There is a critical need for education and safer practices in collegiate and high school wrestling programs.