Mass is a fundamental property of an object that measures the amount of matter it contains. It is a scalar quantity, meaning it only has magnitude and no direction. The SI unit of mass is the kilogram (kg).

Mass is typically measured using a balance or a scale. The most common instrument for measuring mass is the electronic balance, which measures mass by comparing the gravitational force on the object to the force on a standard mass. Another common method is to use a triple-beam balance, which has three beams that allow for fine adjustments to measure mass.

It's important to distinguish between mass and weight. Mass is the amount of matter in an object, while weight is the force of gravity acting on an object. Weight is directly proportional to mass, but it also depends on the gravitational field strength. The formula for calculating weight is W = mg, where W is the weight, m is the mass, and g is the acceleration due to gravity.

Mass plays a crucial role in various scientific fields, such as physics, engineering, and chemistry. In physics, mass is a key parameter in understanding an object's inertia, momentum, and gravitational interactions. In engineering, mass is important for designing structures, machinery, and vehicles. In chemistry, mass is essential for stoichiometry and understanding chemical reactions.

- Understand the concept of mass as a measure of the amount of matter in an object.
- Learn how to measure mass using a balance or scale.
- Be able to differentiate between mass and weight, and understand the relationship between the two.
- Practice solving problems involving mass, weight, and gravitational force.
- Explore real-world applications of mass in various scientific and engineering contexts.

PHYSICAL SCIENCE (NGSS)

Energy

Students who demonstrate understanding can:

Create a computational model to calculate the change in the energy of one component in a system when the change in energy of the other component(s) and energy flows in and out of the system are known.

Develop and use models to illustrate that energy at the macroscopic scale can be accounted for as either motions of particles or energy stored in fields.