PDF chapter test TRY NOW

Take a good quality rubber sucker. It looks like a small rubber cup. Press it hard on a smooth plane surface. Does it stick to the surface? Now try to pull it off the surface. Can you do it?
 
YCIND20220823_4294_Force and pressure_11.png
 
a. The majority of the air between the sucker's cup and the surface  as we press it.
  
b. The applied force must be sufficiently strong to overcome  in order to lift the sucker off the surface.