8thGrade_Physics

Copernicus is the first scientist to realize that …...

• the earth moves around the sun
• the sun moves around the earth
• the earth has gravity
• the sun is a part of the solar system

Answer explanation

Jupiter is a gas giant made primarily of hydrogen and helium. Unlike terrestrial planets that have solid surfaces, gas giants like Jupiter don't have a well-defined solid surface, allowing them to accumulate more mass in a gaseous form. This composition has allowed Jupiter to grow significantly larger than planets with solid surfaces.

When is an object in "motion"?

• When its position does not change relative to another object.
• When its position changes relative to another object.
• When it is lighter than other objects.
• When you get dizzy looking at it.

A reference point is …

• a place or object used for comparison to determine if an object is in motion
• a place higher than the moving object.
• a place or object in the back of a moving vehicle.
• an invisible object used as a reference.

The only star that does not change its position is ….

• the South Star
• the Giant Star
• the North Star
• the Sparkling Star

If you can move as fast as the Earth's speed around the sun, you can go from NYC to LA in …..

• 2 days
• 2 seconds
• 2 hours
• 2 minutes

The basic SI unit for length is …

• meter
• inch
• gram
• unit

The suitable SI unit for measuring distances between cities is …

• mm
• km
• m
• cm

The length of a pencil can be meaured by the SI unit ….

• mm
• km
• m
• cm

The distance between San Francisco and Boston is about

• 4300 mm
• 4300 m
• 4300 km
• 4300 cm

1 km = ? m

• 1000.0
• 100.0
• 10.0
• 10000.0