tract = pull

abstract (adj) pulled away from direct relation to anything; impersonal as in attitude or views

attract (v) to pull into something; to pull into oneself

contract (v) to pull together to make smaller in size or bulk; to pull inward; opposite of “expand”

distract (v) to pull a person’s attention in another direction

extract (v) to pull out by force

protract (v) to pull out; to make something take longer; to prolong

retraction (n) a statement or promise that is pulled back or taken back

subtract (v) to pull some out, therefore having less left over

traction (n) a pull to the arm or leg muscles to bring a bone back into place when it is dislocated or fractured

tractor (n) a powerful vehicle that pulls farm machines and hauls heavy loads