Definitions
Speed and velocity
Components
Distance and displacement
Conversions
100
What is the difference between speed and velocity quantities?
speed is a scalar while velocity is a vector
100
x- component y component Time
5.0 m -2.0 m 10.0 s
-3.0 m -31.0 m 15.0 s
15.0 m 42.0 m 30.0 s
What is the Speed?
98.0 m / 55.0 s =
1.78 m/s
100
15.7 m east
100
What is the distance?
98 m
100
30 minutes = ______________seconds
30 min (60 sec / 1 min) =
1800 sec
200
How do we measure something? What does measuring mean?
Measuring means to see how many times the sample unit is contained in the object we want to measure.
200
x- component y component Time
5.0 m -2.0 m 10.0 s
-3.0 m -31.0 m 15.0 s
15.0 m 42.0 m 30.0 s
What is the magnitude of Velocity?
19.2 m / 55.0 s =
0.350 m/s
200
16.8 m north
200
What is the magnitude of displacement?
19.24 m
200
230 seconds = ________________Minutes
230 seconds (1 minute / 60 seconds)
300
When do you count ending zeros for significant figures identification?
Only when there is a decimal point in the number
300
x- component y component Time
5.0 m -2.0 m 10.0 s
-3.0 m -31.0 m 15.0 s
15.0 m 42.0 m 30.0 s
What is the direction (angle) for velocity?
tan -1 (9/17) = 27.9 degrees N of E
400
When do you count leading zeros for significant figures identification?
Never!!!
500
What is the difference in calculating distance vs. displacement? How do you calculate each?
Distance is the sum of every step taken, while displacement is the magnitude of the vector that connects starting point with ending point.
Calculation-wise, distance is addition of every length, while displacement calculation entails algebraical addition of x components, algebraical addition of y component, squaring x and y components, adding them up and square rooting such addition