How are Earth's motions related to the length of a day?
One rotation on Earth's axis equals one day
How are Earth's motions related to the length of a year?
One revolution of Earth around the sun equals one year
What is Earth's annual motion around the sun called?
Revolution
How does the night sky appear to change through the night?
Objects appear to move from East to West
Which of the following objects is found in Earth's atmosphere? Comet, Meteor, Moon, Planet
Meteor
Why do objects in the sky appear to move west as seasons change?
Earth's position in its orbit has changed
What is inertia?
The tendency of an object to resist a change in motion
What is Newton's first law of motion?
Objects at rest will stay at rest; objects in motion will stay in motion with a constant speed and direction unless acted on by a force.
What kinds of objects can you see in the night sky?
Stars, meteors, comets, the moon, planets
Mars's axis is tilted at about the same angle as Earth's axis. Do you think Mars has seasons?
Yes because the tilt will cause changes in the amount of sunlight reaching Mars.
Why do objects in the night sky appear to move to the west?
The Earth is rotating
If you move two objects farther apart, how does the force of gravity between the two objects change?
The force decreases
What keeps objects in orbit?
Gravity and inertia
What is a constellation?
A group of stars which people imagine to represent a figure
The constellation Orion appears in the eastern sky in December. Where would you expect it to appear in the sky in March?
The western sky
On what day does the sun appear farthest north of the equator?
Summer Solstice
What is weight?
The measure of the force of gravity on an object
What is mass?
The amount of matter in an object