Position, Reference Frames, Displacement, and Distance

All flashcards

What is position?

Position tells where an object is at a particular time, measured relative to a chosen reference frame.

What is a reference frame?

A reference frame is the viewpoint or coordinate system used to describe an object's location and motion.

What is displacement, and how is it calculated?

Displacement is the change in position. Calculate it by subtracting initial position from final position: $\Delta x = x_f - x_0$.

What is distance traveled?

The total length of the path an object takes, including turns or backtracking.

What does the sign of one-dimensional displacement indicate?

Direction relative to the chosen positive direction.

Quiz questions

1. An object moves from $x_0=2\,\text{m}$ to $x_f=7\,\text{m}$. Which calculation gives its displacement?Answer: $7\,\text{m}-2\,\text{m}=+5\,\text{m}$
2. If right is defined as positive, what does a negative one-dimensional displacement indicate?Answer: The object's net change in position is to the left.
3. In one-dimensional motion, how is the distance between an object's initial and final positions found?Answer: Take the magnitude of its displacement.
4. A person walks $10\,\text{m}$ east and then $10\,\text{m}$ west, ending where they started. What are the distance traveled and displacement?Answer: $20\,\text{m}$ traveled and zero displacement.
5. If the chosen positive direction is reversed, what happens to the sign of a nonzero one-dimensional displacement?Answer: Its sign reverses, while the physical motion remains the same.