🟦 CATEGORY 1: GRAVITY
What is gravity?
A force of attraction between objects
What does orbit mean?
Moving around something in a path
What is rotation?
Spinning on an axis
What is revolution?
Movement around another object
What is a shadow?
A dark area made when light is blocked
Why does the moon appear to shine?
It reflects sunlight
Why is Earth’s gravity strong?
Earth has a large amount of mass
Give one example of orbit.
Earth goes around the Sun OR Moon goes around Earth
What causes day and night?
Earth’s rotation
How long does Earth take to revolve around the Sun?
365 days or 1 year
Why do shadows change during the day?
Earth rotates and the sun appears to move
Why does the moon appear to change shape?
We see different parts of the lit half
What direction does gravity pull objects?
Toward the center of Earth
Why do objects stay in orbit?
Gravity pulls them while they are moving forward
How long does one rotation take?
24 hours or a day
What two things cause seasons?
Earth’s tilt and revolution
When are shadows shortest?
Noon
How long is one moon phase cycle?
29.5 days
What slows objects like a parachuter when falling?
Air resistance
Which object orbits Earth?
The Moon
Why does the sun appear to rise in the east and set in the west?
Because Earth rotates from west to east
What happens when a hemisphere tilts toward the sun?
It experiences summer
When are shadows longest?
When the sun is low in the sky
What is a constellation?
A group of stars forming a pattern or image
What must rockets reach to leave Earth?
Escape Velocity
Which object does Earth orbit?
The Sun
Explain how Earth’s rotation causes both day and night.
As Earth rotates, the side facing the sun experiences day and the side facing away experiences night
What happens when a hemisphere tilts away from the sun?
It experiences winter
What causes shadow length to change?
The angle of sunlight
Why does the sun appear brighter than other stars?
It is closer to Earth