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FIGURE 2.7 The rate of movement and the direction of movement of this ship are determined by a combination of direction and size of
force from each of the tugboats. In which direction are the two tugboats pushing? What evidence would indicate that one tugboat is pushing
with a greater force? If the tugboat by the numbers is pushing with a greater force and the back tugboat is keeping the back of the ship from
moving, what will happen?

Forces Applied Net Force

1,000 units east Net = 2,000 units east
1,000 units east

A

1,000 units east Net = 0 units
1,000 units west

B

1,000 units east Net = 1,000 units west
2,000 units west

C

FIGURE 2.8 (A) When two parallel forces are acting on the ship in the same direction, the net force is the two forces added together.
(B) When two forces are opposite and of equal size, the net force is zero. (C) When two parallel forces in opposite directions are not of equal size,
the net force is the difference in the direction of the larger force.

2-9 CHAPTER 2 Motion 33