# 3: Two-Dimensional Kinematics

- Page ID
- 14451

- 3.1: Motion in Two Dimensions
- An object moving with constant velocity must have a constant speed in a constant direction.

- 3.2: Vectors
- Vectors are geometric representations of magnitude and direction and can be expressed as arrows in two or three dimensions.

- 3.3: Projectile Motion
- Projectile motion is a form of motion where an object moves in parabolic path; the path that the object follows is called its trajectory.

- 3.4: Multiple Velocities
- Relative velocities can be found by adding the velocity of the observed object to the velocity of the frame of reference it was measured in.