When does gravity decrease?
When the distance between objects decreases and when the mass of the objects in question decreases.
Would your mass be different on the Moon compared to Earth? Explain.
No, mass always remains constant. It's weight that changes based on gravitational force.
What is an orbit? What causes one?
One object revolving around another in a regular pattern, caused by gravity and inertia.
What is inertia? Give an example of inertia in action.
The tendency of an object to maintain its current motion (unless acted on by an outside force), e.g.: a ball rolling in a straight line will continue to do so.
Can astronauts jump higher on the Moon than on Earth? Why?
Yes, they have less gravitational force acting upon them and therefore less weight.
In what direction would the planets travel if the Sun suddenly disappeared? Explain.
In a straight line because of inertia without gravitational attraction, until they encountered a massive enough object to attract them.
What causes Earth’s seasons to change?
Earth's axial tilt of 23.4 degrees, which affects the directionality of sunlight hitting the Earth.
What is an axis? Where is Earth’s axis?
An imaginary line running through the center of an object. Earth's axis goes vertically between the its two poles.
What are the hemispheres? How do they experience seasons differently?
The northern and southern halves of the spherical Earth, divided by the equator. They experience seasons oppositely.
When it's summer in Canada, what season is it in Australia? Why?
Winter, less direct sunlight due to Earth's axial tilt.
