Vector/Scalar
Give an example of a scalar quantity
time, temperature, distance, speed, etc.
How is distance calculated?
length of the path or add up the total length traveled.
How is speed calculated?
distance divided by time
Define acceleration
change in velocity over time
What about the position-time graph tells you velocity?
the slope
Give an example of a vector quantity
displacement, velocity, acceleration, etc
Define displacement
staightline distance from starting point to ending point
How is velocity calculated?
displacement divided by time
If a car changes its speed from 20 m/s to 40 m/s in 5 seconds, what is its acceleration?
= 20/5 = 4 m/s^2
Describe what a steep slope on a position-time graph indicates about an object's motion vs a shallow slope.
It is moving fast
Definition of scalar quantity
What unit is commonly used to measure distance in physics?
m or km
DAILY DOUBLE!!!
If a car travels 100 km in 2 hours, what is its speed - with correct units?
If an eastward moving car is slowing down, what is the direction of the acceleration?
west
What does a horizontal line on a position-time graph tell you about the motion of the object?
it is at rest or stopped
Definition of vector quantity
A measured quantity with magnitude and direction
DAILY DOUBLE!!
Can distance ever be negative? Explain why or why not.
If you run 3 laps around a track (200 m each lap) in 6 minutes, what is your average speed?
speed is 600/6 = 100 m/min
What is a common unit for acceleration?
m/s^2
What does the line on a position-time graph look like if the object is moving backwards?
(Draw the Graph) a diagnol line with negative slope
Why is time considered a scalar quantity?
It doesn't have direction
Can you ever move for a period of time and still have zero displacement? Explain.
Yes, if you start and end at the same spot
If you run 3 laps around a track (200 m each lap) in 6 minutes, what is your average velocity?
velocity = 0/6 = 0
If a northward-moving car changes its speed from 60 m/s to 30 m/s in 5 seconds. What is the magnitude and direction of the acceleration?
6 m/s to the south
How do you find displacement from a position-time graph?
Difference from starting point to ending point on the y-axis