IN VOLLEYBALL, FORCES ARE BALANCED WHEN TWO PEOPLE HIT WITH EQUAL FORCE, WHILE GOING FOR THE BALL. I KNOW THIS BECAUSE THEY HIT EACH OTHER WITH EQUAL FORCE.
IN VOLLEYBALL, AN EXAMPLE OF A FORCE EXPLANATION AND NET FORCE IS; IF A BALL COMES AT THE PLAYER WITH A FORCE OF 20 N AND THE PLAYER HITS IT WITH 50 N, IT WILL GO 30 N.