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