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### 1D Motion

What’s your frame of reference?

Frames of reference

From where are you measuring?

Frames of Reference

- Location of the Point of Reference
- Measurements are relative
- Standards of Measurement
- Unit Conversions

Distance vs Displacement

How far? What direction?

Distance vs. Displacement

- Total distance does not always equal total displacement
- Distance measured in meters/kilometers
- Displacement is measured in meters/kilometers with direction
- Change in distance = Δd = df- di
- Change in displacement = Δx = xf - xi

Scalar vs. Vector

What is direction anyway?

Speed vs. Velocity

Who wins the tortoise or the hare?

Who wins between the tortoise and the hare?

The tortoise is traveling at a velocity of 0.5 kmph to the north, while the hare is travel at a speed of 10 kmph. Who reaches the finish line first?

The Answer is

- It depends.
- What direction is the hare traveling?
- What direction is the finish line from the starting line?
- Does the tortoise have a head start?

- These are all parts to a frame of reference to determine a winner.

Speed vs. Velocity

- Avg. Speed or speed is measured in kmph or kph
- Speed = (Δ d/Δ t)
- Scalar quanity
- Ex: 30 kph

- Avg. Velocity or velocity is measured in kmph or kph
- Velocity = (Δx/Δ t)
- Vector quantity
- Ex: 30 kph to the north

Practice

- What is the total displacement and total distance of a dump truck that travel a 30 km there and back trip to deliver a load of dirt?
- What is the average speed of a car that traveled 1 km in 5 mins, 10 km in 15 mins, and 30 km in 30 mins?

Practice

- What is the avg. velocity
- What is the average speed of a car that traveled 1 km in 5 mins, 10 km in 15 mins, and 30 km in 30 mins?

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