When we talk about kinematics, especially relative motion, there are some common misunderstandings that can confuse people. Here are a few of them:

1. All Motion is Absolute: Some people think that motion must be looked at from a fixed point. But actually, motion is always about something else. It's important to remember that things like position and speed depend on where you are looking from.

2. Frames are Interchangeable: Many assume you can use any frame of reference without thinking about it. But switching between different frames needs careful attention to their speeds. For example, if frame A is moving at speed $v_A$ and frame B is moving at speed $v_B$, the speed of frame A compared to frame B is found by $v_{AB} = v_A - v_B$.

3. Misunderstanding Velocity Addition: A lot of people find it tricky to add speeds when they are in different frames. It’s not just simple addition. For example, if one object is moving at $10 \, \text{m/s}$ compared to a bench, and the bench is moving at $5 \, \text{m/s}$ compared to the ground, the object's speed compared to the ground would be $15 \, \text{m/s}$.

4. Object vs. Observer: Lastly, some people mix up the motion of an object with the motion of the observer. It's very important to look at how both are moving to explain what’s really happening.

By understanding these misunderstandings, you can get a much clearer idea of relative motion!