Asteroid
one of many small rocky objects between Mars and Jupiter.
Fossil
any remains or imprints of living things from the past.
Weight
A measure of how gravity pulls on an object.
Unbalanced Forces
Forces that do not cancel each other out and that causes an object to change its motion.
Contact Force
A force that occurs as objects touch.
Comet
a mixture of ice and frozen gazes ,rock, and dust left over from the formation of the solar system
Endangered
when a species is in danger of becoming extinct.
Volume
a measure of how much space an object takes up.
Gravity
The force of attraction between any two objects due to their mass.
Friction
A force that opposes the motion of one object moving past another.
Meteor
A chunk of rock that travels through space's atmosphere.
Extinct
when a species has died out completely
Newton
a metric system unit for measuring weight.
Distance
the amount of space between two objects or points; how far away something is.
Design
The art of creating something that does not exist.
Inherited trait
a trait that an offspring acquired from a parent
Instinct
an inherited behavior, one that is not learned but done automatically.
Density
the amount of matter in a certain volume of substance; found by dividing the mass of an object by its volume.
Force
A push or pull
Criteria
principles or standards by something may be judged or decided.
Trait
a quality of a living thing; a characteristic.
Variation
being similar to something else but different in some ways.
Balanced Forces
Forces that act together on an object without changing its motion.
Motion
A change in an object's position over time.
Constraint
A limit to a design process; may be such things as appearance, funding, space, materials, and human capabilities.