Weight is the measure of how heavy an object is. It is the force exerted on an object due to gravity. The unit of weight is the Newton (N) in the metric system, and the pound (lb) in the imperial system.

**Mass vs. Weight:**Mass is the amount of matter in an object, while weight is the force exerted on an object due to gravity. Weight can change based on the gravitational pull, whereas mass remains constant.**Units of Weight:**In the metric system, weight is measured in Newtons (N), while in the imperial system, it is measured in pounds (lb).**Measuring Weight:**Weight is measured using a scale or a balance. It is important to use the appropriate units for measurement.

Weight (W) = Mass (m) x Acceleration due to gravity (g)

W = m x g

Here are some key points to remember when studying weight:

- Understand the difference between mass and weight.
- Learn the units of weight in both the metric and imperial systems.
- Practice using the formula W = m x g to calculate weight.
- Understand the concept of gravitational acceleration and its effect on weight.

By understanding the concept of weight and practicing its calculations, you can gain a solid grasp of this important measurement in physics.

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Measurement (NCTM)

Understand measurable attributes of objects and the units, systems, and processes of measurement.

Understand such attributes as length, area, weight, volume, and size of angle and select the appropriate type of unit for measuring each attribute.

Understand the need for measuring with standard units and become familiar with standard units in the customary and metric systems.

Understand that measurements are approximations and how differences in units affect precision.

Apply appropriate techniques, tools, and formulas to determine measurements.

Select and apply appropriate standard units and tools to measure length, area, volume, weight, time, temperature, and the size of angles.

Grade 5 Curriculum Focal Points (NCTM)

Geometry and Measurement and Algebra: Describing three-dimensional shapes and analyzing their properties, including volume and surface area

Students relate two-dimensional shapes to three-dimensional shapes and analyze properties of polyhedral solids, describing them by the number of edges, faces, or vertices as well as the types of faces. Students recognize volume as an attribute of three-dimensional space. They understand that they can quantify volume by finding the total number of same-sized units of volume that they need to fill the space without gaps or overlaps. They understand that a cube that is 1 unit on an edge is the standard unit for measuring volume. They select appropriate units, strategies, and tools for solving problems that involve estimating or measuring volume. They decompose three-dimensional shapes and find surface areas and volumes of prisms. As they work with surface area, they find and justify relationships among the formulas for the areas of different polygons. They measure necessary attributes of shapes to use area formulas to solve problems.