Speed & Velocity
Is speed a vector quantity or scalar quantity? Why?
scalar; only has magnitude
A car is slowing down, is the acceleration vector going to face left or right?
left
What is the equation for calculating speed?
speed = distance/time
What is the equation for acceleration?
(final speed - initial speed) / time
What is the equation for calculating velocity?
velocity = displacement/time
Is acceleration a scalar or a vector quantity? Why?
vector; has magnitude and direction
An object travels 4 m in 2 s. What's the speed?
2 m/s
What are the metric units for acceleration?
m/s2
If I ride my bike 5 km in 1 hour. Calculate my SPEED. Be sure to convert to proper units.
1.38 m/s
What can a negative acceleration mean? Give two explanations.
slowing down
accelerating in reverse
Is velocity a vector quantity or scalar quantity? Why?
vector; has magnitude and direction
They will be opposite.
Acceleration left
Velocity right
I ran 7 m/s for 900 seconds. Calculate the distance I ran.
6300 meters
An object's velocity increase from 0 m/s to 20 m/s in 2 seconds. What's the acceleration?
(20 m/s - 0 m/s)/2 s = 10 m/s2
An object travels at 10 m/s for 5 seconds. How far did it travel?
s = d/t
t*s = d
(5 s)(10 m/s) = 50 m
A car traveling at 45 m/s increases its velocity to 80 m/s in 5 s. What is its acceleration?
7 m/s2
An object travels backward at a velocity of 20 m/s for 4 s, what is the displacement?
80 m backward
Calculate the acceleration. Include correct units to count as correct. A car is going 50 m/s and slows down to 13 m/s in 9.5 seconds.
-3.89 or -37/9.5
v = 10 m/s
d = 70 m
t = ?
7 s
A car accelerates at 5 m/s2 and its initial speed was 20 m/s. Calculate the final speed if the car did this in 8 seconds.
60 m/s