Up quark
Up quarks are subatomic particles that help make up many larger particles, such as protons. Up quarks have a charge of +2/3, and are the lightest of the six types of quarks. Up quarks have a spin of 1/2, which is the spin all fermions have. They are affected by all four of the fundamental forces, which are gravity, the strong force, the weak force, and electromagnetism. Up quarks are elementary particles, similar to all other quarks. This means that they are so small that scientists believe that they can not be divided any more.