Motion Type 1: Uniform Motion What is Uniform Motion? Uniform motion describes an object travelling at a constant speed in one direction Uniform motion describes an object travelling at a constant speed in one direction

Characteristics of Uniform Motion 1) Distance: 1) Distance: A measure of length A measure of length Base unit is the meter or “m” Base unit is the meter or “m” Displacement: Displacement: The length that an object has moved from a starting reference point The length that an object has moved from a starting reference point In physics, when we talk about distance, we are really referring to a change in distance In physics, when we talk about distance, we are really referring to a change in distance Change in distance = final distance – initial distance Or…∆ d = d f - d i

Characteristics of Uniform Motion 1) Distance 1) Distance Change in distance example: Change in distance example: If Mr. Okrainetz starts at rest and travels 3.5m, what is his change in distance? If Mr. Okrainetz starts at rest and travels 3.5m, what is his change in distance? Use: ∆ d = d f – d i d f = 3.5m d i = 0 m ∆ d = 3.5m – 0m ∆ d = 3.5m

Characteristics of Uniform Motion 2) Time 2) Time Change in time example Change in time example It took Mr. Okrainetz 1.1s to travel his distance from rest It took Mr. Okrainetz 1.1s to travel his distance from rest Use ∆ t = t f – t i t f = 1.1s t i = 0s ∆ t = 1.1s – 0s ∆ t = 1.1s

Characteristics of Uniform Motion 2) Time 2) Time A measure of duration A measure of duration Base unit is the second or “s” Base unit is the second or “s” In Physics when we talk about time, we are really referring to a change in time In Physics when we talk about time, we are really referring to a change in time Change in time = final time – initial time Or… ∆ t = t f - t i

Characteristics of Uniform Motion 3) Velocity 3) Velocity A measure of a specific distance travelled in a specific amount of time A measure of a specific distance travelled in a specific amount of time Velocity = change in distance change in time change in time Or… v = ∆ d ∆ t ∆ t Base unit for velocity is meters per second or “m/s” Base unit for velocity is meters per second or “m/s”

Characteristics of Uniform Motion 3) Velocity 3) Velocity Example of velocity Example of velocity Based on the previous two examples, how fast was Mr. Okrainetz travelling? Based on the previous two examples, how fast was Mr. Okrainetz travelling? Use v = ∆ d ∆ t ∆ t ∆ d = 3.5m ∆ t = 1.1s v = 3.5m 1.1s 1.1s v = 3.18 m/s or sig fig correct answer = 3.2 m/s