Site Glossary

A simplified representation that ignores complicating effects.

A pulley assumed to have negligible mass and friction.

A theoretical rope with no mass and no stretching.

A string assumed to have negligible mass and no stretching.

The measured size of the magnified image.

The ability of the adaptive immune system to respond more quickly to pathogens it has encountered before.

The body system that protects against disease-causing organisms.

Treatment that helps the immune system attack cancer.

Velocity immediately before striking a surface.

The attachment of the blastocyst to the uterine lining.