Science Chapter 19 Flashcards
Astronomy
The study of the moon, stars, and other objects in space.
Equinox
The two days of the year on which
neither hemisphere is tilted toward of away from the sun.
Revolution
The movement of an object around another object
Axis
An imaginary line that passes through Earth’s center North and South poles, about which Earth rotates.
Orbit
The path of an object as it revolves around another object in space.
Rotation
The spinning motion of a planet on its axis.
Solstice
The two days of the year on which the sun reaches its greatest distance north of south of the equator.
Force
A push of pull exerted on an object
Gravity
A force that moves rocks and other materials downhill; the force that pulls objects toward eachother
What determines the strength of the force of gravity between two objects?
The masses, and distance
The force of gravity on an object
Weight
On the moon, you would weigh:
One sixth
What keeps the moon orbiting around the earth, and the earth sun?
Gravity and inertia.
Universal Gravitation
Every object attracts every other object.
Mass
The amount of matter in an object
Inertia
The tendency of an object to resist a change in motion
Newtons First LAW
Object in motion, stays in motion unless acted on by a force.
hoi
Aloha : )
Earth rotates on its
Axis
The spinning of Earth on its axis
causes:
Day and Night
How long does it take Earth to make on revolution around the sun?
365 and one 4th
Earths axis is tillted at an angle of
23.5
It takes ________ hours for Earth to rotate
24
Equinox=
equal night
The position of the moon, Earth and sun causes the phases of
The moon eclipses, and tides
A lunar eclipse occurs when earth is between moon and sun
What i just said
The darkest part of moons shadow: ( total eclipse north tonowandians)
Umbra
Twice a month the earth, moon, and sun are in a straight line combined bla bla bla… form
Spring tide
tides occur:
12.5 hrs.
Space race was between
US and Soviet union 1957 -
A rocket needs ____ to propell forward
Thrust
Velocity
Speed in a given direction
Orbital velocity
V a rocket needs to orbit
Escape V
What a rocket needs to go into space
Maria
Dark flat areas which galileo called maria
Moon has:
Maria, crater, and highlands.
Why is an extra day added to Feb. every four years?
What two factor combine to keep planets in orbit?
Inertia and Gravity
Identify four objects that travel into space
Space shuttle, rover, Space probe, Space station.
Some probes have small robots that can move on planet surface called
Rovers
The american effort to land a person on the moon was
The Apollo Program
A rocket can only carry so much fuel. The main Advantage of a multistage rocket is that the
Total weight of the rocket is greatly reduced as it rises
