Space Systems: Stars and the Solar Systems

Gravity on Earth (Page 198-199) Gravity is:

• the force that pulls objects toward the center of the Earth.

• the energy that objects use to move.

• the process of objects floating in the air.

• the heat produced by the Sun.

Gravity is a type of:

• Push force

• Pull force

How is the force of gravity working on the skydiver?

• It pulls the skydiver downward toward the Earth.

• It pushes the skydiver upward away from the Earth.

• It has no effect on the skydiver.

• It makes the skydiver float in the air.

Where on Earth is “down”?

• Towards the center of the Earth

• Towards the North Pole

• Towards the South Pole

• Parallel to the surface

Revolution: _____________________________________________________________________________________________ ________________________________________________________________________________________________________ ________________________________________________________________________________________________________

• The spinning of Earth on its axis

• The movement of Earth around the Sun

• The changing phases of the Moon

• The tilt of Earth's axis

Revolution: _____________________________________________________________________________________________ ________________________________________________________________________________________________________ ________________________________________________________________________________________________________

• A sudden and significant change

• A type of government

• A peaceful agreement

• A scientific experiment

Earth's rotation on its axis causes:

• Day and night

• Seasons

• Tides

• Earthquakes

Which time period is closer to the scientific meaning of a day?

• The time period between sunrise and sunset

• The 24-hour time period between one sunrise and the next sunrise

Real and apparent motions are different because:

• Real motion is the actual movement of an object, while apparent motion is how the movement appears to an observer.

• Real motion is observed only at night, while apparent motion is observed during the day.

• Real motion refers to imaginary objects, while apparent motion refers to real objects.

• Real motion and apparent motion are always the same.

The location of a rider's shadow is determined by what?

• The position of the sun

• The speed of the rider

• The color of the rider's clothes

• The type of bicycle