Site Glossary

a natural object in space, such as a planet, moon, star, or asteroid.

Acceleration directed toward the centre of circular motion.

a force directed toward the centre of a circular or curved path.

(Δv)– Final velocity minus initial velocity.

The event that occurs when velocity passes through zero and changes sign.

motion in which an object's speed increases or decreases.

light produced when a charged particle moves through a medium faster than light can propagate through that medium.

an orbit with approximately constant distance from the central object.

The rate at which the separation between approaching objects decreases.

Two angles whose sum is 90°.