Uniform Linear Motion Model: Model Development & Motion

Sections 1.2 & 2.2: Physics 1

What are the assumptions for a uniform linear motion model?

particle, 1D motion, constant velocity, neglect air resistance & friction

What is Uniform Linear Motion?

Uniform = constant

Linear = one-dimensional or along a straight line

motion = position is changing

What is distance traveled?

The length of the path (trajectory) taken when an object moves from one position to another

What is the symbol and SI unit of distance traveled?

Distance traveled and meter

What is average speed?

The distance traveled divided by the elapsed time

What is the symbol and SI unit of average speed?

Average speed and meter per second

What is displacement?

The difference between the final position and the initial position

Delta x= xf - xi

What is the symbol and SI unit for displacement?

Delta x and meter

What is the average velocity?

The displacement divided by the elapsed time

What is the symbol and SI units for average velocity?

V (upper bar) x and meter per second

Motion in the positive position:

Average speed → positive value

Average velocity → positive value

Motion in the negative direction:

Average speed → positive value

Average velocity → negative value

Round trip:

Average speed → positive value

Average velocity → zero

What is instantaneous velocity?

The velocity at an instant time

What is the symbol and SI unit for instantaneous velocity?

vx and meter per second

What is instantaneous speed?

The speed at an instant time

v = I vx I

What is the symbol and SI unit for instantaneous speed?

v and meter per second

What does your cars speedometer measure?

Instantaneous speed

What does the motion diagram for the uniform linear motion model include?

World line, coordinate system, system, vector, physical quantities