how do lizards overcome the gravitational fore and climb the walls?
Answers
Lizards have pads on their feet. ... These minute hooks create the conditions like a suction pump and thus, enable lizards to run up on apparently smooth walls and even upside down on plaster ceilings. Because these hook-like cells are bent downward and to the rear, the lizard curls its toes upwards to disengage them
The very first thing that you need to get cleared about, is that GRAVITY is one of the 4 known and verified fundamental forces (Electromagnetic Forces, Strong Forces, Weak Forces, and Gravity) of nature. Almost everyone and everything in the whole universe is affected by Gravity. I could go on and on about the Theoretical concepts of Physics and Einstein’s General Relativity, but I will just tell you this (as you are clearly an amateur), that everything including the Lizard is affected by the force of Gravity. Wherein the Lizard seems to defy Gravity is in the fact that Gravity is a comparatively Weaker force compared to the other 3 fundamental forces of nature (for us Physicists, it’s way too weak) and thus any smaller force can counteract is. What the Lizard possess in its lower body are structures that act as ‘Suction Cups’ which in turn help the adhesive and cohesive forces between the Lizard and the surface to stay strong. You see the adhesive and cohesive forces between the Lizard and the surface is way stronger in Magnitude than the force of Gravity exerted on the Lizard. If you pull it off using a stick, it will fall down almost immediately. Although, after mentioning Gravity being weak ( Acceleration due to Gravity is 9.81 m/s though which is actually fast and Force = Mass x Acceleration), I wouldn’t recommend you to fly or jump out of the window to another surface soon.