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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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An object thrown in the air follows a parabolic path under the influence of Earth's gravitational force. The motion of such an object is called projectile motion, and the object itself a projectile. The parabolic path followed by the projectile is called the trajectory. Some common examples of projectile motion are the launching of fireworks, a golf ball in the air, meteors entering the Earth's atmosphere, and the firing of bullets.
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The theory of projectile motion is very useful for players of several sports to improve their performance. For example, a javelin thrower needs to throw their javelin in such a way that it travels as far as possible. The javelin thrower takes a short run-up to increase the initial speed of the javelin. The range of a projectile is at its maximum at a 45° angle so javelin throwers try to angle their throw as close to 45° as possible.
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Related Experiment Video

Updated: Feb 20, 2026

Using Eye Movements to Evaluate the Cognitive Processes Involved in Text Comprehension
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Keep your eye on the target.

Bruce F Kimler1

  • 1a Department of Radiation Oncology , University of Kansas Medical Center , Kansas City , KS , USA.

International Journal of Radiation Biology
|October 17, 2017
PubMed
Summary

Target Theory, crucial for radiation biology, has shaped research for nearly 100 years. Its core concepts continue to influence scientific thinking in this field.

Area of Science:

  • Radiation Biology
  • Radiobiology
  • Molecular Radiation Biology

Background:

  • Historical overview of Target Theory's inception.
  • Evolution of fundamental concepts in radiation biology.
  • Influence of early theories on modern scientific inquiry.

Observation:

  • Tracing the origins and developmental trajectory of Target Theory.
  • Examining the foundational principles that underpin radiation biology.
  • Documenting the historical impact of theoretical frameworks on scientific progress.

Findings:

  • Target Theory's enduring legacy in radiation biology.
  • The continuous influence of its central concepts on researchers.
  • A century-long impact on the field's intellectual landscape.
Keywords:
Radiationtarget theory

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Implications:

  • Understanding the historical context of radiation biology research.
  • Appreciating the foundational role of Target Theory.
  • Informing future research directions by examining historical influences.