Speed
Why do we need average speed?
What is a vector?
a measure that has size 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
Give me an example vector.
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Describe how are velocity changes in 3 cases at a traffic light.
-the light turns red and then green heading straight
- same but we turn left
velocity change - speed decreases/ increases - no direction change
same but we add a direction change
My direction changes. Did I accelerate?
yes.
What are the axis on a velocity time graph? Horizontal and vertical.
H - Time
V - Velocity
How fast our position changes
Irish Wristwatch, Swiss Wristwatch
I wish to wash my Irish Wristwatch
Which wristwatches are Swiss Wristwatches?
gooooooooodddddd
How is average speed and average velocity different?
Average speed depends on total distance travelled. Average velocity depends on total distance from the starting point. Think of a running track!
What does acceleration measure?
how quickly the velocity is changing.
You can carry it everywhere you go, and it does not get heavy. What is it.
Your Name
Our speed at any given instance is called what?
Instantaneous speed or moment to moment speed
3 vector quantities?
velocity, acceleration, force!!!!
What 2 quantities make up velocity? example
size and direction. km/h
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.
How was Deep Space 1 able to achieve such a huge speed increase?
*Double Points* Draw the Distance - Time graph and Velocity - Time graph
A very small positive acceleration over a long period of time.
466.66666666666
What units do vectors have?
vectors can have any unit. It depends on the circumstance :P
My velocity is 12mph NW and my friend's velocity is 12mph also. Why are our velocities not the same?
Although the size is the same. I never said if our direction is. He was actually travelling West :P
What is the formula for acceleration?
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Who is Kenneth Cutler? page iii?