PDF chapter test TRY NOW

1. Explain why the sliding friction is less than the static friction.
  
a. Sliding friction is  than the static friction.
  
b. Moving an object that is already moving is somewhat  than initiating motion.
 
2. Explain why objects moving in fluids must have special shapes.
  
a. To fluid friction, objects must be specially shaped.
  
b. Front portion of the objects should be  than the middle portion.