Units
Real-Life Issues
The Fast and the Faster
Graphs
Theory
100
One unit for distance (metric only)
meters, centimeters, millimeters, kilometers...
100
Bob walks 4 miles in 2 hours. What is Bob's speed?
8 miles per hour
8 mi/hr
100
Ac c e l eration = (???)/(Time)
Change in velocity
100
Is this a distance vs. time or a velocity vs. time graph?
distance vs. time
100
What we call something changing position, compared to a frame of reference
Motion
200
What is a unit for speed?
m/s, km/hr, mm/s, etc.
200
Leonard Fournette just makes it to the end zone, with 10 seconds left on the clock. He has a top speed of 10.8 yards per second. How far was he from the end zone?
108 yards
200
If something is increasing in speed/velocity, we call it acceleration. If it is decreasing, we call it what?
Deceleration
200
This graph shows which of the following:
A. A distance vs. time graph at 0
B. A speed/velocity vs. time graph at 0
C. A distance vs. time graph with constant velocity
D. A speed/velocity vs. time graph of constant velocity
D. A speed/velocity vs. time graph of constant velocity
200
velocity is always in this format:
unit type 1/unit type 2
What are the two unit types?
Unit type 1: distance
Unit type 2: time
300
What does this symbol stand for?
Change in/of
said "Delta"
300
A cat tracks a mouse slowly through tall grass 120 cm. It takes her 30 seconds. How fast was this game of cat and mouse?
4 cm/s
300
What does this equation say?
a=(v_f-v_i)/t
Acceleration equals final velocity minus initial velocity, all divided by time.
300
What does the following graph say?
Something is increasing in speed over time- acceleration
300
Acceleration is different from velocity in its units how?
The time is 2
400
Solve for the correct unit:
(cm)/(hr) * (hr)/min * (m)/(cm) =
Correct unit is m/min
400
A plane flies overhead at 300m/s. In 5 hours, how far has it flown in km?
5400 km
400
A car gets on the on ramp to the freeway going 9 m/s and gets to 27 m/s at the freeway. If it took the car 30 seconds to reach that speed, what was its acceleration?
0.6 m/s2
400
What does this graph say?
Speed is decreasing over time- deceleration
400
What is the difference between speed and velocity?
(Hint: distance and displacement have the same difference)
Speed/distance- amount (scalar)
Displacement/velocity- amount plus direction (vector)
500
What is this a unit of?
(m/min)/s
acceleration (distance/time)/time
Why isn't it "time2"?
500
Mari has 3 minutes to get to class, but she wants to stop by to get a drink first. Class is 15 meters away, and the water fountain adds 5 more meters each way. If she runs 20 m/min, will she make it?
Yes, her total time comes to 1.25 minutes if she runs that fast.
500
Kyrie Irving can accelerate at a rate of 10 m/s2. If he takes 1.2 seconds to reach the basket, starting standing still, how fast is he going when he gets to the rim of the basket?
12 m/s
500
Which speed vs time graph says the following story?
A girl walks slowly to a park. While there, she takes a short break on a bench. Then, filled with energy, she runs home.
A
B
A. is the correct graph
500
If a rock is thrown upwards, what is happening to its velocity?
It increases right when thrown, but then decreases as it goes up until it stops and falls back down.