1. The is the sum of all forces acting on an object. a. When forces act in the same direction, you can the

forces together.

b. If forces act in the direction, add them just as you

add positive and negative numbers.

2. Forces are or unbalanced.

a. If the net force acting on an object is 0 N, the forces acting on it are forces.

b. forces do not affect the motion of an object.

c. forces are the result of a net force that does not equal

zero that acts on an object.

d. The motion of an object changes when forces act on it.