LABORATORY MANUAL 13 



EXERCISE V (Textbook 64) 



TO FIND THE WEIGHT OF A BODY BY USE OF 

 THE PLATFORM BALANCE, OR TRIP SCALE 



APPARATUS: Platform balance, bodies to be weighed 

 (blocks of wood used in previous experiment, pieces of 

 stone or metal). 



DIRECTIONS FOR WORK: Place the body to be weighed 

 upon the left-hand platform. Have the sliding weight at 

 the point of the scale. Upon the right-hand platform, 

 place weights that will nearly balance the body. Move 

 the sliding weight to such a position that the platforms are 

 at the same level. Record the weight in grams to .1 g. 



Platform balance, number 



Body No. Weight 

 -g- 



RESULTS 



1. What change in the apparatus occurred when the 

 block was placed on the left platform? Explain. 



2. When the " weighing" is accomplished, what keeps the 

 platforms at the same level? 



3. Describe some other kind of balance. 



4. What force is measured in weighing a body? 



EXERCISE VI (Textbook 66) 

 TO FIND THE DENSITY OF A SOLID 



APPARATUS: Balance, jar of water, metric measure, 

 various solid bodies. 



DIRECTIONS FOR WORK: If the body is a regular solid, 

 find its volume by measurement (Ex. IV), and its weight 

 by use of the balance (Ex. V). If the body is irregular and 



