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Related Concept Videos

Social Facilitation01:04

Social Facilitation

Not all intergroup interactions lead to negative outcomes. Sometimes, being in a group situation can improve performance. Social facilitation occurs when an individual performs better when an audience is watching than when the individual performs the behavior alone. This typically occurs when people are performing a task for which they are skilled.
Rolling Without Slipping01:09

Rolling Without Slipping

People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is essential...
Kinetic Friction01:26

Kinetic Friction

Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car begins...
Obesity01:24

Obesity

The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in adipocytes...
Rolling With Slipping01:14

Rolling With Slipping

Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can affect...
Kinetic Energy for a Rigid Body01:13

Kinetic Energy for a Rigid Body

Imagine a solid object involved in a general planar movement, with its center of mass pinpointed at a spot labeled G. The object's kinetic energy relative to an arbitrary point A can be quantified for each of its particles - the ith particle in this case. This measurement is achieved through the employment of the relative velocity definition. The position vector, known as rA, extends from point A to the mass element i.

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Related Experiment Video

Updated: Jun 20, 2026

Kinematics and Ground Reaction Force Determination: A Demonstration Quantifying Locomotor Abilities of Young Adult, Middle-aged, and Geriatric Rats
10:28

Kinematics and Ground Reaction Force Determination: A Demonstration Quantifying Locomotor Abilities of Young Adult, Middle-aged, and Geriatric Rats

Published on: February 22, 2011

Physical activity: Cinderella or Rodney Dangerfield?

Antronette K Yancey1, James F Sallis

  • 1UCLA Kaiser Permanente Center for Health Equity, Division of Cancer Prevention and Control Research, Los Angeles, CA 90095, USA. ayancey@ucla.edu

Preventive Medicine
|September 1, 2009
PubMed
Summary

Physical inactivity is a major health issue, yet resources for promotion are insufficient. This analysis highlights the need for increased investment and strategic action to boost physical activity levels across all populations.

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Area of Science:

  • Public Health
  • Health Promotion
  • Behavioral Science

Background:

  • Physical inactivity is a leading cause of mortality, disability, and healthcare expenditure.
  • Current investments in physical activity promotion are inadequate compared to the scale of the problem, particularly in the US.
  • There is a significant gap in capacity for physical activity promotion relative to other health risk behaviors.

Discussion:

  • The commentaries in this special issue address key issues from diverse viewpoints.
  • Recommendations focus on immediate actions to increase population-wide physical activity.
  • Emphasis is placed on ensuring benefits reach all societal segments, especially high-risk groups for chronic diseases.

Key Insights:

  • Underinvestment in physical activity promotion hinders public health efforts.
  • A coordinated, multi-perspective approach is necessary to overcome barriers.
  • Prioritizing physical activity is crucial for mitigating chronic disease burdens.

Outlook:

  • Stimulate research institutions to prioritize physical activity research.
  • Encourage public health agencies to elevate physical activity promotion.
  • Urge policymakers to integrate physical activity into public health agendas.