Weight

In science and everyday life, weight refers to the force of gravity acting on an object. It is a measure of how heavy an object is. Weight is different from mass, which is the amount of matter in an object. While mass is always the same no matter where the object is located, weight can change depending on the gravitational pull of the planet or celestial body.

Units of Weight

Weight is commonly measured using the metric system in units such as grams (g) and kilograms (kg), and in the imperial system using ounces (oz) and pounds (lb).

Measuring Weight

Weight is measured using a scale. A spring scale measures weight by determining the force needed to counteract the gravity acting on an object, while a balance scale compares the weight of an object to the weight of standard masses. Digital scales are commonly used for precise measurements.

Changing Weight

An object's weight can change when it is taken to a location with a different gravitational force. For example, an object will weigh less on the moon than on Earth due to the moon's weaker gravitational pull.

Summary

Weight is the force of gravity acting on an object, measured in units like grams or pounds. It can change based on the gravitational pull of the location. Understanding weight is important in fields such as physics, engineering, and everyday tasks like weighing ingredients for cooking.

◂Math Worksheets and Study Guides Third Grade. Estimation

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The resources above cover the following skills:

Number and Operations (NCTM)

Understand numbers, ways of representing numbers, relationships among numbers, and number systems.

Understand the place-value structure of the base-ten number system and be able to represent and compare whole numbers and decimals.

Compute fluently and make reasonable estimates.

Develop and use strategies to estimate the results of whole-number computations and to judge the reasonableness of such results.

Select appropriate methods and tools for computing with whole numbers from among mental computation, estimation, calculators, and paper and pencil according to the context and nature of the computation and use the selected method or tools.

Algebra (NCTM)

Use mathematical models to represent and understand quantitative relationships.

Model problem situations with objects and use representations such as graphs, tables, and equations to draw conclusions.