96 THE LEVER. 



8 feet from the other end. Give the pressure on each point of sup- 

 port. 



32. Length of lever = 3 feet ; where must the fulcrum be placed 

 so that a weight of 200 Ibs. at one end shall be balanced by 40 Ibs. 

 at the other end ? 



33. In one pan of a false balance, a roll of butter weighs 1 Ib. 



9 oz. ; in the other, 2 Ibs. 4 oz. Find the true weight. 



34. A and B at opposite ends of a bar 6 ft. long carry a weight 

 of 300 Ibs. suspended between them. A's strength being twice as 

 great as B's, where should the weight be hung ? 



35. A and B carry a quarter of beef weighing 450 pounds on a 

 rod between them. A's strength is 1} that of B's; the rod is 8 

 feet long ; where should the beef be suspended ? 



36. Length of lever = 16 feet ; weight at one end, 100 pounds : 

 what power applied at other end, 3- feet from the fulcrum, is re- 

 quired to move the weight ? 



37. A power of 50 Ibs. acts upon the long arm of a lever of the 



first class ; the arms of this lever are 5 and 40 inches respectively. 

 The other end acts upon the long arm of a lever of the second 

 class ; the arms of this lever are 6 and 33 inches respectively, (a.) 

 Figure the machine. (6.) Find the weight that may be thus sup- 

 ported, (c.) What power will support a weight of 4,400 kilograms? 



Recapitulation. To be amplified by the pupil for 

 review. 



f DEFINITION. 

 RELATION TO ENERGY. 

 USE. 

 GENERAL LAWS. 



THE LEVER. 



BENT. 

 COMPOUND. 



MOMENTS OF FORCES. 



DEFINITION. 

 ARMS. 



STATIC LAWS. 



( True. 



CLASSES. 



1. BALANCE.-! 



False. , 



i Weighing. 



2. LOAD BETWEEN TWO SUPPORTS. 



