In physics, mass is a measure of the amount of matter in an object. It is a fundamental property of an object that determines its resistance to acceleration when a force is applied. The standard unit of mass in the International System of Units (SI) is the kilogram (kg).

Mass is different from weight, which is the force exerted on an object due to gravity. While an object's mass remains constant regardless of its location, its weight can vary depending on the strength of the gravitational field. Mass is often measured using a balance scale, which compares the mass of an object to that of known masses.

The kilogram (kg) is the base unit of mass in the SI system. Other units of mass include the gram (g) and the metric ton (t). In the imperial system, mass is measured in pounds (lb) and ounces (oz).

Mass can be calculated using the formula:

Mass = Density × Volume

Where:

- Mass is the mass of the object (in kilograms)
- Density is the density of the material (in kilograms per cubic meter, kg/m³)
- Volume is the volume of the object (in cubic meters, m³)

Study GuideAlgebraic Equations Worksheet/Answer key

Algebraic Equations Worksheet/Answer key

Algebraic Equations Worksheet/Answer key

Algebraic Equations Worksheet/Answer keyAlgebraic Equations Worksheet/Answer key

Algebraic Equations Worksheet/Answer keyAlgebraic Equations

Algebra (NCTM)

Represent and analyze mathematical situations and structures using algebraic symbols.

Recognize and generate equivalent forms for simple algebraic expressions and solve linear equations

Grade 6 Curriculum Focal Points (NCTM)

Algebra: Writing, interpreting, and using mathematical expressions and equations

Students write mathematical expressions and equations that correspond to given situations, they evaluate expressions, and they use expressions and formulas to solve problems. They understand that variables represent numbers whose exact values are not yet specified, and they use variables appropriately. Students understand that expressions in different forms can be equivalent, and they can rewrite an expression to represent a quantity in a different way (e.g., to make it more compact or to feature different information). Students know that the solutions of an equation are the values of the variables that make the equation true. They solve simple one-step equations by using number sense, properties of operations, and the idea of maintaining equality on both sides of an equation. They construct and analyze tables (e.g., to show quantities that are in equivalent ratios), and they use equations to describe simple relationships (such as 3x = y) shown in a table.