Unit 3 Flashcards
(18 cards)
What tells you about the precision of measurements?
Sig figs
What tells you about the accuracy of measurements?
Percent Error
How can the velocity of an object be determined from a distance-time graph?
The velocity is the slope
An object is at rest. What is its velocity?
0 m/s
Ball on the ground lab:
-IV
-DV
-CS (s)
-IV: distance (m)
-DV: time (s)
-CV: ramp height, ball bearing
Ball on the ground lab:
What did the c-value mean in real life?
Velocity
If the ramp had been higher, how would the c-value be different?
The c-value would be bigger
If the ball had been heavier, how would the c-value be different?
It would stay the same.
Vector
A quantity with magnitude (size of the number / bigness) and direction (velocity, displacement, acceleration, force)
Scalar
Has magnitude, but not direction (speed, time)
Speed
How fast something goes (connected to Velocity)
Velocity
Speed in a certain direction (connected with Speed)
Distance
How far something goes
Time
How long it takes - duration
What are the appropriate units for speed and velocity?
distance unit
——————-
time unit
Can any of the vocab words be negative? If so what does the negative sign mean?
Velocity: sign tells the direction
+away from observer
-closer to the observer
What does “constant speed” mean?
Stays the same the whole time
Not speeding up or slowing down
(0 m/s is at rest, NOT moving at constant speed)
What does it mean if the graph is pointing down?
It’s starting away from us and object is getting closer
