Gravity in the Solar System

What is weight?

• The amount of push and pull your body is creating.

• How many pounds something weighs.

• The force of gravity pulling your mass to the center of Earth.

• The force of gravity pushing your mass away from the Earth.

Order the strength of gravitational attraction from strongest to weakest between Earth and each of these objects: train engine, cow, basketball and a car.

• cow, car, train engine, basketball

• train engine, car, cow, basketball

• car, cow, train engine, basketball

• basketball, train engine, cow, car

How often does the moon orbit the Earth?

• 27.3 days

• 32.7 days

• 27.3 hours

• 23.7 days

What causes the ocean tides?

• The Sun's gravitational pull on the moon and Earth.

• The Earth's gravitational pull on the moon.

• The Sun's gravitational pull on Earth.

• The moon pulling on Earth.

Which planet takes the longest time to orbit the Sun?

• Mars

• Saturn

• Neptune

• Venus

• Jupiter

When planets move around the Sun they do not travel in a circle. Their orbit is an ____________________.

• straight line

• rectangle

• square

• ellipse

Jupiter is farther from Earth than Mars is. Why does Jupiter have a stronger gravitational pull on Earth than Mars does?

• It has less mass than both the Earth and Mars.

• It has a greater mass than both the Earth and Mars.

• It is closer to Earth than Mars.

• Jupiter is larger than the Sun.

Which planet is furthest from the Sun?

• Saturn

• Neptune

• Uranus

• Jupiter

Why do astronauts get taller in space?

• They eat better food.

• They take pills that help their bones grow.

• Because on Earth gravity compresses their vertebrae.

• Because in space gravity compresses their vertebrae.

Why do astronauts have to wear a space suit when walking on the moon?

• There is no nitrogen.

• There is no carbon dioxide.

• There is no oxygen.

• There is no water.