Vocabulary
When an object moves at the same speed; the speed at any moment is exactly the same.
constant speed
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What is the SI unit for speed or velocity?
m/s
Matthew and Marie moving down the road. They walk a distance of 250.0 meters in 30.0 seconds. What was their average speed in m/s?
8.33 m/s
A roller coaster is moving at 25 m/s at the bottom of a hill. Three seconds later it reaches the top of the hill moving at 10.0 m/s. What was the acceleration of the coaster?
-5.0 m/s2
Label the following as vector or scalar quantities:
Distance
Displacement
Velocity
Speed
Distance = scalar
Displacement = vector
Velocity = vector
Speed = scalar
What axis has the dependent variable?
y-axis
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The distance an object travels in a specific unit of time.
Speed
What is the equation for speed
v=d/t
Matthew’s Ferrari goes a distance of 350.0 km in a time of 2.0 hours. What was his average speed in m/s?
38.6 m/s
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DOUBLE JEOPARDY! x2 points!
A swimmer speeds up from 1.1 m/s to 3.2 m/s during the last 13.0 seconds of the race. What is the acceleration of the swimmer?
0.20 m/s2
James spins around 5 times without moving in any direction. What is his distance traveled and his displacement?
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What is the average speed Sasha swam in km/min?
0.18 km/min
The rate at which velocity changes.
acceleration
What is the SI unit for acceleration?
m/s2
If on the following day she ran 300.0 m in 30.0 s, by how much did her average speed increase?
1.70 m/s
How many seconds will it take a car to go from 0.00 to 12.2 m/s if it’s accelerating at 1.4 m/s2?
8.7 s
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Amy runs 2 miles south, then turns around and runes 3 miles north. What is her displacement?
Displacement = 1 mile north
Which cyclist kept a constant speed throughout the entire race? What was this speed in km/min?
Kim 0.20 km/min
The distance an object travels in a specific unit of time in a particular direction.
Velocity
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DOUBLE JEOPARDY! x2 points!
When measuring velocity or acceleration, we usually convert units like km and hours to ____ and _____.
meters and seconds
How fast was a plane flying if it traveled 40.0 km in 30.0 min, in m/s?
22.2 m/s
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If a speeding train hits the brakes and accelerates at a rate of –1.09 m/s2, how long will it take for the train to go from 54.8 m/s to 12.0 m/s?
39.3 s
Jermaine runs exactly 2 laps around a 400 meter track. What is his distance traveled and displacement?
Distance = 800 m
Displacement = 0 m
Describe the 4 lines (A, B, C, and D) on the Velocity vs Time graph.
A = fast acceleration
B = no movement
C = Constant speed
D = decelleration
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a place or an object used for comparison to determine if something is in motion
reference point
What is the formula for calculating acceleration?
a = change in velocity (final velocity - initial velocity) / time
If the average speed of a car is 45 km/h, how many km can it travel in 40 min?
The car can travel _____ in ______.
The car can travel 30 km in 40 min.
A speed skater just finished a record setting race. After she crossed the finish line, she coasted to a stop on the ice. If her initial speed was 13.0 m/s and her acceleration was -2.9 m/s2, how long did it take her to stop?
Ray runs 30 feet north, 30 feet west, then 30 feet south. What was his distance traveled and displacement?
Distance = 90 ft
Displacement = 30 ft west
Which cyclist won the race and their winning time? What was the average speed of the person in second place?
Kim, 50 minutes
Sasha - 0.18 km/min
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The speed of an object at one exact point in time; one point on a slope of a graph describing various speeds
instantaneous speed
Cassy walks 1 mile north then turns west and walks 2 miles. What is the name of the formula needed to find the displacement?
Pythagorean theorum.
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Patrick and Emily are walking to the grocery store to buy some treats. They walk 3.0 kilometers in 900.0 seconds. What was their average speed in m/s?
3.3 m/s
A car goes from a stop to 110.0 km/h in 25 s. What is the acceleration in m/s2?
1.2 m/s2
What is her distance and displacement?
Distance = 47 m
Displacement = 38.3 m NE
Which cyclist started off the fastest? How do you know from the graph? What was his average speed?
Barry, his line on the DT graph is the steepest, 0.17 km/min