### Concept Items

#### 5.1 Vector Addition and Subtraction: Graphical Methods

There is a vector $\overrightarrow{\text{A}}$, with magnitude 5 units pointing towards west and vector $\overrightarrow{\text{B}}$, with magnitude 3 units, pointing towards south. Using vector addition, calculate the magnitude of the resultant vector.

- 4.0
- 5.8
- 6.3
- 8.0

#### 5.2 Vector Addition and Subtraction: Analytical Methods

True or False—Every 2-D vector can be expressed as the product of its x and y-components.

- True
- False

#### 5.4 Inclined Planes

True or False—Kinetic friction is less than the limiting static friction because once an object is moving, there are fewer points of contact, and the friction is reduced. For this reason, more force is needed to start moving an object than to keep it in motion.

- True
- False

#### 5.5 Simple Harmonic Motion

With reference to simple harmonic motion, what is the equilibrium position?

- The position where velocity is the minimum
- The position where the displacement is maximum
- The position where the restoring force is the maximum
- The position where the object rests in the absence of force