kitchen scale
Activity

Gravity and Weight

A hands-on activity to introduce students who are blind and visually impaired to gravity and weight.

History:

People have been weighing objects forever, but it was the Greek people who first tried to figure out what weight is and how to explain weight.  A Greek man named Archimedes said weight was determined by (opposition of buoyancy) whether objects sink or float.  An Ancient Greek named Euclid was the first to say that “weight is the heaviness or lightness of one thing compared to another, as measured by a balance.” About 300 years ago, a scientist from England, Isaac Newton, determined that weight is the “force” of an object depending on the amount of stuff/matter the object is made of (mass) and the pull of gravity on the object.  Objects weigh less on the moon than they do on Earth because there is less gravity (W=mg).

Science Process Skills:

Materials

  1. Paper folded in half and labeled (one half “heavy” and the other half “light”).
  2. Variety of objects with varying degrees of weight (block, rock, pebbles, feather, plastic toys, sponges, balls, etc.)
  3. Pan balance
  4. Units for weight, standard or nonstandard (grams, ounces, beans, pennies)
  5. Standard scales and spring scales

Part I:  Compare and describe 2 objects as heavy or light

Explain and Demonstrate: 

  1. Given two objects, use your hands to compare and identify the heaviest object and the lightest object by placing the objects on designated area of a labeled, folded, piece of paper. 
  2. Compare the objects by placing one object in one pan of the balance and the second object in the other pan of the balance.
  3. Based on observation (evidence) of the position of the pan (up or down), identify the object as heavier or lighter.
    • Examples:
      • The pan with the rock is down.  The rock is heavier than the feather.  
      • The pan with the feather is up.  The feather is lighter than the rock.
  4. Weigh each object and record the weight on a class chart.
class chart of weights
Template of the class chart

Continue to Part II, or compare two new objects.

Part II:  Compare the weight of 3 objects close in weight

  1. Students receive 3 objects to compare.
  2. Allow a minute or two for the students to manipulate the objects.
  3. Ask students to place the objects in order from the lightest to the heaviest.  May use a labeled piece of paper if needed.
  4. Students will weigh each object using the pan balance and place the objects in the correct order (lightest to heaviest).
  5. Record the weights on a class chart.
  6. As a class, compare the data and make conclusions for the correct order of the weights from lightest to heaviest. 
class chart of weights of different objects
Template of the class chart

Note:  this chart is only an example, any objects may be used.  

The higher the skills of the student, the closer the weights of the objects.

Part III:  Extensions to every day life

* Do not allow students to stand on the bathroom scale. 

NGSS Standards

3-PS2-1 Motion and Stability: Forces and Interactions

By Selma Walsh

Collage of gravity and eight

Return to Accessible Science main page.

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