8th Grade Science Semester Final Review 2023-24

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What is Newton's First Law of Motion?

Back

Newton's First Law, also known as the Law of Inertia, states that an object at rest will remain at rest, and an object in motion will continue in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Front

What is the significance of the tilt of the Earth?

Back

The tilt of the Earth (approximately 23.5 degrees) is responsible for the changing seasons as different parts of the Earth receive varying amounts of sunlight throughout the year.

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What is a transform plate boundary?

Back

A transform plate boundary is where two tectonic plates slide past each other horizontally, often causing earthquakes and faults.

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What are red giants?

Back

Red giants are a late stage in the life cycle of stars, characterized by a large size and a reddish color, occurring after a star has exhausted the hydrogen in its core.

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What is a chemical property?

Back

A chemical property is a characteristic of a substance that becomes evident during a chemical reaction, such as flammability, reactivity with acids, or the ability to oxidize.

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What happens to an object in motion when no external forces act on it?

Back

According to Newton's First Law, the object will continue to move in a straight line at a constant speed.

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What is the role of friction in motion?

Back

Friction is a force that opposes the motion of an object, causing it to slow down or stop.

Front

What is the difference between a physical property and a chemical property?

Back

A physical property can be observed without changing the substance's chemical identity (e.g., melting point), while a chemical property can only be observed during a chemical change (e.g., flammability).

Front

What is the effect of Earth's rotation on day and night?

Back

The rotation of the Earth on its axis causes different parts of the Earth to face the Sun or move away from it, resulting in the cycle of day and night.

Front

What is a divergent plate boundary?

Back

A divergent plate boundary is where two tectonic plates move away from each other, often creating new crust as magma rises to the surface, forming features like mid-ocean ridges.