Science QA2 Review

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What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

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What is a chemical change?

Back

A chemical change occurs when a substance transforms into a different substance with different properties. This often involves a chemical reaction.

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What is elastic potential energy?

Back

Elastic potential energy is the energy stored in elastic materials as the result of their stretching or compressing.

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What is kinetic energy?

Back

Kinetic energy is the energy of an object due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

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What is gravitational potential energy?

Back

Gravitational potential energy is the stored energy of an object based on its height above the ground, calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

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What is a net force?

Back

Net force is the overall force acting on an object when all the individual forces are combined. It determines the object's motion.

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What are metalloids?

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Metalloids are elements that have properties of both metals and nonmetals. They are found on the periodic table and include elements like silicon and germanium.

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What is the difference between potential and kinetic energy?

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Potential energy is stored energy based on position, while kinetic energy is the energy of motion.

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What is the law of conservation of energy?

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The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.

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What is a balanced force?

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A balanced force occurs when two forces acting on an object are equal in size but opposite in direction, resulting in no change in motion.