Speed
How do you calculate average speed?
total distance traveled over total time
What is a vector?
a measure that has size/magnitude and direction
Velocity is - a speed. True or false?
Speed in a specific direction.
When is there is no acceleration?
Velocity does not change. Speed and Direction are the same!
What does a flat line mean on a D-T graph and a V-T time graph.
no speed - stationary
no acceleration - constant speed
What 2 quantities do we need to calculate speed?
distance and time
A person walks 4 m/s east for about 20 minutes. What is the magnitude of their velocity?
4m/s
Describe 3 examples of how a car's velocity can change at a traffic light.
-the light turns red and then green --speed up
- same speed but we turning left/right at the light
--Slowing down to stop at the light
My direction changes. Did I accelerate?
yes.
What does a constant speed look like on a velocity-- time graph and a distance-time graph?
Velocity-time=Flat horizontal line anywhere other than zero
Distance-time=Straight diagonal line (up or down)
What does speed measure?
How fast our position changes/How fast something moves
distance traveled divided by time
Longer arrows indicate a _________ magnitude where as shorter arrows indicate _________magnitude.
More, Less
Speed or Velocity?
A) A person travels 20 miles in 2 hours
B) The cheetah ran East at 60 mi/h
C) The spider slowly moved upward in its web
Speed, Velocity, Velocity
What does acceleration measure?
how quickly the velocity is changing.
One a distance time graph, the steeper straight and diagonal line.....
the faster the speed
Speed! Speed! Oh gosh I need a ____________.
Rhyme
Name 2 vector quantities.
velocity
acceleration
force
What 2 quantities make up velocity? example
speed and direction
A car is heading north. In order to make it speed up, what direction do I need to apply the acceleration?
North. Same direction as motion causes a speed up.
What does it look like when an object is accelerating on a position-time graph and also a speed-time graph?
d-t graph=Curved line up or down
v-t=Straight diagonal line up or down
If I run 7 laps of a 400m track at an average speed of 6m/s. How long will it take me?
466.7 s
What standard units do velocity vectors have?
meters/second (plus direction)
My velocity is 12mph NW and my friend's velocity is 12mph SW. Describe both people's speed and both people's velocities.
Same speed, different velocities (different directions).
What are three ways to accelerate?
Speeding up, Slowing down, changing direction
What is the formula for acceleration?
a=Vf-Vi/ delta t