ESS1-2 8th Grade Assessment

First & Last Name

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1. What does the strength of the force of gravity depend on?

• The masses of the objects and their speed
• The mass and weight of the objects
• The masses of the objects and the distance between them
• The length of the object and its speed

2. What is the definition of inertia?

• The force of a push or a pull on an object
• The force pulling us towards the Earth
• increasing force because of increased mass of an object
• The tendency of an object to resist change in motion

3. What controls the orbits of objects in our solar system?

• Speed and light
• Inertia and gravity
• Gravity and speed
• Momentum and inertia

4. Our solar system is part of the

• Milky Way Galaxy
• Andromeda Galaxy
• Magellan Galaxy
• Perseus Galaxy

5. What is the shape of the Milky Way Galaxy?

• elliptical
• oblong
• spiral
• irregular

6. How many stars are estimated to be in the Milky Way Galaxy?

• Less than 100,000
• At least 100 billion
• About 1000
• About 100 million

7. The gravitational force of the sun is the sole reason the planets and other bodies orbit around it, holding the solar system together.

• true
• false

Explain what this diagram is showing about space and large objects like a planet.

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Explain the relationship between mass of an object and gravity of that object.

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