Ohaus PRIMER BALANCE Manual - Manual (Page 7)

7
how many cards?
OBJECTIVE :
To make comparisons of mass using a nonstandard
unit of measure.
MATERIALS: Primer Balance
A deck of playing cards
Some round objects:
Tennis ball
Golf ball
Marble Ping Pong ball
Super ball
Ball bearing
PROCEDURE: 1. Guess the number of playing cards that will
equal the mass of the objects listed below.
2. Record your guess and then find the number
using the balance.
Your Guess
(Number of
Playing Cards)
Material
Actual Number of
Cards Needed to
Balance the Object
Tennis ball
Golf ball
Marble
Ping pong ball
Super ball
Ball bearing
Nonstandard