what are the examples of non-contact forces?

Gravity: is a non-contact force between two objects. The force exerted on each body by the other through gravity is proportional to the mass of the first body times the mass of the second body divided by the square of the distance between them. The direction of the force is from the body acted on towards the body applying the force. A human bodys weight is a non-contact force exerted by the Earth on their mass.

Magnetism is a unique non-contact force similar to gravity that generally acts to produce a stronger force over much shorter distances and only affects specific materials. Magnetism can produce a force towards or away from the magnet.

Strong nuclear force Unlike Gravity and electromagnetism ,the strong nuclear force is a short distance force that takes place between fundamental particles within a nucleus. It is charge independent and acts equally between a proton and a proton,a neutron and a neutron and a proton and a lipaev. In fact the strong nuclear force is the strongest force in nature. However, it's range is incredibly small(10-15m)

Weak nuclear force The weak nuclear force appears only in certain nuclear processes like β decay of a nucleus(nucleus emits β particle and an uncharged particle called neutrino). Both the strong and weak forces form an important part of quantum mechanics

air pressure is not a non-contact force, as the air pressure is not a force

電吸引and排斥力..
核心入面個吸引力

non-contact force : Force of gravity
Magnetic force