Key Terms
The Earth
How many inches are in a foot?
12in
In a speed graph what are the axes?
x = time
y = distance
What is the displacement of a man who ran 20km East and then 55km West?
35km West
The three types of speed discussed in class are: constant, average, and ___________________.
Instantaneous
A vector is both a magnitude (measurement) and ___________.
Direction
1cm = .39 in
How many centimeters are in a foot?
30.48cm
Draw a speed graph where the object moving is staying a constant speed.
x = time
y = distance
line = Any straight line
If it takes a truck 6 hours to travel 4000km, what is the average speed of the truck?
666.66km/hour
Which of the three types of speed never changes?
Constant
A change in position over an amount of time is the definition of what?
Speed
If a car has enough gas to travel 50 more miles, how many meters can it go before running out?
1 mile = 1.6km
80,467 m
What would a speed graph look like if the object was not moving?
Flat line
How long would a balloon floating up at a velocity of 5m/s take to get 320 meters up?
64 seconds
How can an objects velocity change without its speed changing?
If its direction changes
Define motion
A change in position
Solve for time in minutes:
v = 15m/s
d = 450m
t = ?
.5 minutes
Draw a speed graph with two lines, one for a marble dropped down a ramp at 5cm up, and one dropped from 20 cm up.
Both lines should be diagonal and straight with the 5cm being below the 20cm.
How far will a cyclist go if they travel at 20km/min for a total of 2 hours?
2,400 km
Show all three formulas that can be used to solve a speed question. (It is really one formula that can be rearranged)
v = d/t
d= v x t
t = d/v
Name a scalar quantity
Mass, weight, speed, distance, etc.
Anything measurement without a direction.
Disposable wipes take 2 weeks to breakdown in your piping. Suppose a wipe will not reach the sewer/septic tank until fully broken down.
If it takes 2 weeks for a wipe to go from the drain to a septic tank 150 yards south. What is the average velocity in meters/hour?
1 yard = 3 feet 1 foot = .3m
v = .4m/hr South
What would a speed graph look like if the object was accelerating?
Curved line
What would the average velocity be of a runner on the track who ran a total distance of 4000m in 40 minutes. *The starting line and finish line are at the same point on a track.*
Please answer in m/sec
0 m/s
A woman is walking her dog and travels north 30m and then East 10m. What is her displacement from her starting point? Show all work
Displacement = 31.6m Northeast