The basic definition of pressure is force/area and the scientific community defined that as the Pascal (Pa).
        
                    
             
        
        
        
Friction between the ball and the floor is stealing some of the kinetic energy of the ball, and turning it into heat.
 
        
             
        
        
        
You could put sheet metal lining the bottom or something similar to that.. yOU could use rubber to make it have more friction
        
             
        
        
        
The efficiency of steam engine is  26.66 %.
<h3>What is Efficiency?</h3>
The efficiency is defined as the work done by the engine divided by the heat supplied. 
Work done is the difference between the heat supplied and heat rejected.
So, efficiency η = (Qs -Qr) / Qs
Given is the heat supplied Qs = 225 Joules and heat rejected Qr =285 . then the work done is
W = 225 -225 = - 60 Joules
Efficiency η  = 60/225 x 100%
 η = 26.66 %
Thus, the efficiency of the steam engine is  26.66 %.
Learn more about efficiency.
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