Gravity
What is the force that pulls objects toward the center of Earth?
Gravity
What is Earth's revolution?
The movement of Earth around the sun.
What is Earth's rotation?
The spinning of Earth on its axis.
What causes seasons on Earth?
The tilt of Earth’s axis and its revolution around the sun.
What is a moon phase?
The different appearances of the Moon due to its position relative to Earth and the sun.
Which of the following best describes gravity?
A. It pushes objects away from Earth.
B. It is a force that causes objects to lift.
C. It is an attraction between two heavy objects.
D. It pulls objects toward the center of Earth.
D. It pulls objects toward the center of Earth.
How long does it take for Earth to complete one revolution around the sun?
Approximately 365 days (1 year).
How long does it take for Earth to complete one rotation?
Approximately 24 hours.
What is the tilt of Earth's axis?
23.5 degrees.
How long does it take for the Moon to complete one cycle of phases?
About 29.5 days.
Which example shows a pulling force?
A. An acorn falling from a tree
B. Water rising from a pot as steam
C. A rocket launching
D. A magnet attracting a metal object
A. An acorn falling from a tree
What effect does Earth's revolution have on the seasons?
It causes different parts of Earth to receive varying amounts of sunlight throughout the year, leading to seasons.
Why do we experience day and night?
Different parts of Earth face the sun and experience day while others face away and experience night.
How do the seasons differ in the Northern and Southern Hemispheres?
The Northern Hemisphere experiences summer when the Southern Hemisphere experiences winter, due to the tilt and position of Earth.
Why do we see the Moon at different shapes throughout the month?
The Moon's position relative to the Earth and sun changes the amount of sunlight reflecting off it that we can see.
What do the arrows in a gravitational force diagram represent?
The direction of the gravitational force (toward the center of Earth).
Explain how Earth's tilt impacts its revolution in relation to the sun.
Earth's tilt (23.5 degrees) causes different hemispheres to receive direct sunlight at different times during its revolution.
What direction does Earth rotate?
West to east.
Why is it summer in one hemisphere when it is winter in another?
When one hemisphere is tilted toward the sun, it experiences summer; the opposite hemisphere experiences winter.
Describe how sunlight affects the appearance of the Moon.
Sunlight reflects off the Moon's surface, illuminating it from different angles as it orbits Earth.
Describe how gravity affects a skydiver's fall when the parachute opens.
Gravity pulls the skydiver down, but the parachute creates drag, slowing the fall.
How does the revolution of Earth affect the length of a year?
One complete revolution takes about 365 days, defining the length of a year.
What is the impact of Earth's rotation on time zones?
Earth's rotation creates time zones since different areas receive sunlight at different times.
Explain how Earth's revolution around the sun affects seasonal changes.
As Earth revolves, the tilt changes the angle of sunlight, affecting daylight and temperature, thus creating seasons.
Explain the sequence of moon phases from new moon to full moon.
The sequence includes new moon, crescent, first quarter, gibbous, full moon, and back through gibbous, third quarter, crescent, to new moon.