Chapter 9- Motion and Energy Flashcards
What is the SI basic unit of length?
a meter
Speed
how fast you are going
speed = distance/time
Velocity
speed in a given direction
How is motion plotted on a graph? What is always on the x-axis?
motion is plotted based on distance and time
the x-axis is always time because its the independent variable
Acceleration
the rate in change in velocity
Deceleration
slowing down (opposite of acceleration)
How is acceleration calculated?
final velocity plus final speed over two
Reference point
a place or object used for comparison to determine if something is in motion
Where are SI units used?
international system
What 2 things must you know to calculate speed?
distance and time
What is constant speed? What does it look like on a distance vs time graph? What does it look like on a speed vs time graph?
when the speed of an object stays the same
it is a straight line, and distance keeps going but speed stays the same
What are 2 things that can change for acceleration to occur?
distance and time
Is the Earth accelerating?
yes because it’s moving around the sun in a circular motion
Motion
when an object’s distance from another object is changing
