Vocab
speed at any moment
A. average speed
B. constant speed
C. instantaneous speed
C. instantaneous speed
If a car is traveling at an average speed of 60 kilometers per hour, how long does it take to travel 12 kilometers? (t=d/s)
0.2 hours
TRUE OR FALSE
Acceleration can occur when an object stops
FALSE
This must be included with speed in order to describe velocity.
direction
Mrs. Curry drove from GBMS to 5 and below for a squishy parked for an hour and drove back. On a distance vs time graph what would her parking for an hour look like?
horizontal (flat) line segment
speed that stays the same
A. average speed
B. constant speed
C. instantaneous speed
B. constant speed
The average speed of a bird for 6.0 seconds is 2 meters per second. What is the total distance traveled by the bird? (d=s*t)
12 m
A skateboarder slows from 20 m/s to 10 m/s in 5 seconds what type of acceleration is this?
negative
Which example describes velocity?
A. A car traveling 60 km/h
B. A runner moving 8 m/s north
C. A bike traveling 15 miles per hour
D. A turtle moving 1 m/s
B. A runner moving 8 m/s north
A distance–time graph shows a straight line that slopes upward from left to right. What does this tell you about the object's motion?
A. The object is standing still
B. The object is moving away at a constant speed
C. The object is slowing down
D. The object is moving backward
B. The object is moving away at a constant speed
total distance traveled by total time
A. average speed
B. constant speed
C. instantaneous speed
A. average speed
A ball moves a distance of 10 meters in 5 seconds. What is the average speed of the ball? (s=d/t)
2.0 m/s
On a velocity vs. time graph, this feature of the line tells you the object’s acceleration.
slope
Which statement best describes speed?
A. Speed includes direction
B. Speed is distance divided by time
C. Speed measures acceleration
D. Speed is the same as velocity
B. Speed is distance divided by time
Two students walk the same path. On a distance–time graph, Student A’s line is steeper than Student B’s line. What does this mean?
Student A walked faster
the rate at which velocity changes
acceleration
What is the velocity of a truck that travels 75 miles north in 2.5 hours? (V=d/t in a direction)
30 miles/hr North
A velocity–time graph shows a line that increases from 10 m/s at 0 seconds to 30 m/s at 5 seconds. The line is straight. The slope of this graph represents this quantity, describes how quickly the object's velocity is changing. What is it?
Acceleration
Two runners have the same speed, but they run in opposite directions. What is different about their motion?
their direction/velocity
A velocity vs. time graph shows four different lines. One line is horizontal above the time axis, one slopes upward, one slopes downward, and one is horizontal on the time axis. This line represents a car moving at a constant speed in a forward direction.
horizontal line above the time axis
speed in any given direction
velocity
An object has initial velocity of 50 m/s and a final velocity of 25 m/s. It takes 5 seconds to travel. What is the acceleration of the object? (A=Vf-Vi/t)
-5 m/s2
Name three things that can happen when something is accelerating. (remember the motions)
increases speed
decreases speed
changes direction
This must be included with speed in order to describe velocity.
direction
A distance–time graph shows a line that becomes steeper over time. What does this indicate?
Acceleration/ The object is speeding up