Free fall is when the only force acting on a falling object is gravity.
100
What does the slope of a distance vs. time graph represent?
speed
200
what is speed in a given direction?
velocity
200
How many types of acceleration are there?
Three
200
On Earth, what is the acceleration of an object in free fall?
Gravity - 10m/s*s
200
What does the slope of a velocity vs. time graph represent?
acceleration
300
The reading on a speedometer gives...
instantaneous speed
300
What are the types of acceleration?
acceleration (forward), deceleration (backwards), and a change in direction
300
An object begins at 10 m/s and ends at 20 m/s over the course of 2 s, what is its acceleration?
5 m/s*s
300
What does it mean if the slope of a distance vs. time graph is negative?
It means an object is slowing down.
400
Velocity changes when...
speed and/or direction changes
400
A car moving in a straight line steadily increases its speed each second, first from 35 to 40 km/h, then from 40 to 45 km/h, then 45 to 50 km/h. What is its acceleration?
5 km/h*s
400
How fast is an object in free fall traveling after 4 s?
40 m/s
400
What does it mean when the slope of a distance vs. time graph is zero?
There is no motion (no speed)
500
When do two cars have the same velocity?
When they are traveling at the same speed in the same direction.
500
A certain car can go from 0 to 60 km/h in 4.5 s. What is its acceleration?
13.33 km/h*s
500
How far has an object in free fall traveled after 4 s?
d=1/2gt^2
80 m
500
What does it mean when the slope of a velocity vs. time graph is zero?