5th - Science - Unit 8 Lesson 2 Flashcards
(20 cards)
The strength of gravity increases as the ___________ of objects increases and decreases as the distance between objects increases.
Total mass
Is a force of attraction, or pull, between any two objects?
Gravity
The Sun’s gravitational pull on Earth is ___________ than its pull on a planet much farther away, such as Neptune.
Stronger
Is the path that one object takes around another object?
Orbit
What does the Earth and the other planets move in orbits around?
The Sun
What is it called when moving objects have a tendency to keep moving in a straight line?
Inertia
Because of the effects of gravity and inertia, the Earth moves in what nearly circular orbit shape?
Ellipse
A complete spin on its axil?
Rotation
At any time, half of Earth faces the Sun and has _____________, while the other half faces away and has ________________.
Daylight, darkness
What is it called when every year, Earth makes one complete trip around the Sun?
Revolution
As Earth revolves around the Sun, sunlight strikes different parts of the Earth at different what?
Angles
Why does sunlight strikes Earth differently at different times of the year?
Because the Earth’s axis is tilted about 23 degrees.
What does the changes in the angle of sunlight on the Earth’s surface cause?
The seasons
What season is it when the Northern Hemisphere is tilted away from the Sun?
It is winter in the Northern Hemisphere.
Due to the Earth’s rotation, the constellations appear to change what from season to season?
Position
Certain constellations, such as Orion, are only visible during which season in the Northern Hemisphere?
Orion is only visible in winter in the Northern Hemisphere.
Why do the Sun, stars, and Moon appear to move from east to west across the sky?
Because of the Earth’s rotation
Is the Sun a star?
Yes, a star is an object that produces thermal and light energy. The Sun is an average-sized star Nd the largest object in the solar system.
What causes seasons?
The changes in the angle of the sunlight on the Earth cause the seasons.
What keeps Earth in orbit around the Sun?
Xxxxxxx
