Unit 1b Review

The diagram below shows the effect of mass and distance on the force of gravity. Which configuration will result in the greatest gravitational force?

• small masses far apart

• large masses far apart

• small masses close together

• large masses close together

What happens to the gravitational force if the mass of one of the objects increases?

• The gravitational force decreases.

• The gravitational force increases.

• The gravitational force remains the same.

• The gravitational force becomes zero.

Charlotte is observing the paths that planets take as they move around the Sun. Which term best describes the shape of the orbit of planets in our solar system?

• circular

• elliptical

• spherical

• centripetal

Arjun is reading about different regions in our solar system. He comes across the Kuiper Belt and wonders where it is located. Where is the Kuiper Belt located?

• outside the orbit of Neptune

• between the orbits of Earth and Mars

• between the orbits of Jupiter and Mars

• between the orbits of Neptune and Jupiter

Santiago is watching a documentary about astronauts traveling through space. He wonders why the planets in our Solar System move around the Sun instead of floating away. What causes the planets to orbit the Sun rather than drift off into space?

• momentum

• the force of gravity

• the force of magnetism

• heat energy from the Sun

Which of the following is correct about the Milky Way galaxy?

• The Milky Way galaxy contains only one solar system.

• The Milky Way galaxy is shaped like a perfect sphere.

• The Sun is part of the Milky Way galaxy.

• Earth is the largest planet in the Milky Way galaxy.

Daniel is building a model of the solar system and wants to place the asteroids in the correct location. Where should Daniel place most of the asteroids as they revolve around the Sun?

• between the orbits of the Sun and Mercury

• between the orbits of Neptune and Pluto

• between the orbits of Earth and Venus

• between the orbits of Mars and Jupiter

James is watching a meteor shower and wonders where most meteors come from. Where do most meteors come from?

• Oort Cloud

• Kuiper Belt

• Asteroid Belt

• The Sun

Which two forces work against each other to maintain the structure of our Solar System?

• gravity and friction

• inertia and magnetism

• gravity and inertia

• pressure and temperature

Our solar system is located within a huge collection of stars, gas, and dust. What is this collection called?

• a nebula

• a galaxy

• a planet

• a cluster