Chapter 7
instantaneous speed
Is the speed at which an object is moving at a given instant time
Speed
On a distance versus time the slope of the line indicates the 😃 of an object
Rise divided by run
Slope
instantaneous speed
The speed at which an object is moving at a given instant in time
The sun
Best reference point for describing the motion of planets in our solar system
Average
The 😃 speed of an object is found by dividing the total distance by the total time
Kilometer
There are 1,000 meters in a
Millimeters
There are 1,000 😃 in a meter
Centimeters, kilometers, and millimeters are
They are SI units how far it's form point A to point B
instantaneous speed
the speed at a given point in time
Instantaneous
A speedometer shows the 😃 speed of a vehicle
speed
The distance an object moves per unit of time
49km/hr
200km/5hr
slope
The steepness of a line on the graph
Is
A Ferris wheel turning at a constant speed of 5m/s is not 😃 accelerating. False
75.9km/hr
A car travels 1025km northeast form El Paso to Dallas in 13.5 hours what was the average velocity
T= 22km/hr
A car travels 66 kilometers in 3 hours what is its speed
Vertical
A distance versus time graph will never show a horizontal line. False
S=4m/s
A jogger runs the first 1000 meters of a race in 250 seconds what is the joggers speed
Reference point
A place or object used for comparison to determine if something is in motion
How do you determine whether an object is in motion
A reference point that is fixed to earth such as a building, tree, is usually used
105000km
A space shuttle travels in orbit at 21000km/hr how far will it travel after 5 hours
0
A speed versus time graph for a cars motion is a horizontal line at a speed of 12m/s. The car's acceleration during this time is 😃 12m/s2. False
8.3m/sec
A student practicing for a track meet ran 250m in 30 seconds what is her average speed
International system of units
A system of measurement scientists use
International system of unite
A system of measuring units scientists use
400
Alfonso ran 1,000 meter race in 2.5 minutes. Aldo did average speed was 😃 m/min
8m/s
An airplane is accelerating at 8m/s. Each second it's speed increases by
Less
An airplane is accelerating at-8m/s2. The distance the airplane travels each second is 😃 than the distance it traveled during the previous second
50
An airplane is flying west at 22km/h. Two hours later, iris flying west at 300km/h. It average acceleration is 😃 100km/h2. False
10m/s2
An amusement park ride falls straight down for 4 seconds. During this time, the ride accelerated from a speed of 0m/s to 40m/s. The rides rate of acceleration during 4 seconds is
Average speed
An object divide the total distance traveled by the total time
🔐
An object is in motion if it changes position relative to a reference point
Motion
An object is in 😃 if it's position changes relative to another object
44cm/sec
At 10:05 AM an ant wandered onto a rear track at 94-cm Mark it crawled in a westerly direction until it reached 50cm mark at 10:06 what is the velocity of the ant
Determine the motion of planets in our solar system what is a good reference point
The sun cause the planets revolve around the sun
Average speed
Divide the total distance traveled by the total time
Acceleration=
Final speed- initial speed/ time
S=13.3km/min
How fast was a plane flying if it traveled 400 km in 30 minutes
8sec
How long would it take Master Supersnail to travel 3a meters if its speed is 4m/s
3
If a car travels 75 kilometers with an average velocity of 25km/hr how long did it take the car to reach its destination
True
If a train is slowing down it is accelerating
motion
If it position changes relative to another object
🔐
In science acceleration refers to increasing speed decreasing speed or changing direction
🔐
In science, acceleration refers to increasing speed, decreasing speed, or changing direction
S=6m/s
Jack went a total of 129 meters in 20 seconds what was the average speed for the entire ride on his skateboard
The family car
Jane is sitting in the family car. Her mother is driving her from their house to the library. Jane waves as she passes her friend Marina. What is not moving which respect to Jane
The front entrance of the school
Jeff is in a stationary school bus. The beat reference point for him to use to determine when the bus starts to move
You are standing what is your motion relative to the car and the plane
Left to right
Changing position relative to another object
Motion
Speed
Object is the distance the object moves per unit of time
Speed
Of an object is the distance the object moves per unit of time
Constant
On a distance time graph a straight Lind indicates that an objects speed is zero. False
True
On a distance versus time graph a speed of zero would appear as a horizontal line
Reference point
Place or object used for comparison to determine if an object is in motion
Reference point
Place or object used for comparison to determine if something is in motion
distance divided by time
Speed
Velocity
Speed in a given direction
Velocity
Speed in a given direction to
Velocity
Speed in given direction
4 m/s
Speed= 32m/8s
25km/hr
Suppose a car travels 60 kilometers the first two hours and 15 kilometers the next hour. What is the cars average speed
5km/hr
Suppose you ride your bicycle into the countryside on a bike path. You travel 6 kilometers the first hour, 3 kilometers the second hour, and 6 kilometers the third hour. What is your average speed for the whole ride?
Three examples of reference points
Surface of the earth, building, and tree
Meter
The SI unit for measuring distance is the
M/S
The SI unit for speed is m/min. False
It is difficult to determine which direction motion is occurring
The best reason for not using a moving car as a reference point
Distance
The length of the path between two points
International system of units
The measurement system used by scientists
Average speed
The quantity can you calculate if you know that a car travels 30 kilometers in 20 minutes
Acceleration
The rate at which the velocity of an object changes is the objects rate of
Acceleration
The rate at which velocity changes
acceleration
The rate at which velocity changes
Dividing
The slope of a line is found by multiplying the rise by run. False
1m/sec
The speed of the car during the first four seconds
M/s2
The standard SI unit for acceleration are 😃 km/h2
Slope
The steepness of a line on a graph
🔐
To calculate the speed of an object divide the distance the object travels by the amount of time it takes to travel that distance
Direction
To describe this an objects motion you need to know both its speed and its
Speed
To find the acceleration of an object moving in a straight line you must calculate the change in 😃 distance for each unit of time. False
Average speed
Total distance divided by total time
Objects that make good reference points to determine whether or not the train is moving
Tree, building, parked cars, people not moving
Meter
What is the SI unit of distance
0-4m/secs
What time period was the car moving fastest
🔐
When you know both the speed and direction of an objects motion you know the velocity of the object
🔐
When you know both the speed and direction of an objects motion, you know the velocity of the object
Right to left
You are riding a plane your motion relative to the person standing on the sidewalk and the car
🔐
You can show the motion of an object on a line graph in which you plot distance versus time
🔐
You can use both a speed versus time graph and a distance versus time graph to analyze the motion of an accelerating object
🔐
You can use both a speed versus time graph and distance versus time graph to analyze the motion of an accelerating object
Reference point
is a place or object used for comparison to determine if something is in motion
