The gauge of the shotgun is 12.

Friction is the resistance encountered when two objects move against each other.

The teacher made a correction to my homework.

The loud bang startled me.

There is a defect in the product.

I spent all day in the lab conducting experiments.

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His behavior was inhibited by the strict rules.

The differential equation is difficult to solve.

The coefficient of friction determines how much two surfaces will slide against each other.