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Wenger - Physical Science > Constant motion > Flashcards

Constant motion Flashcards

1
Q

Position

A

The location of an object in relation to some “reference point”

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2
Q

Reference Point

A

A point or exact location that can be used to help describe the location of some other point or object.

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3
Q

If you say a ball is 30 feet up, what would typically be your reference point.

A

The ground below the ball.

(The ball would be 30 feet away from the reference point or ground in this case)

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4
Q

Speed

A

How fast an object is traveling. Distance the object travels in a unit of time.

(Direction is not important)

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5
Q

The location of an object in relation to some “reference point”

A

Position

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6
Q

A point or exact location that can be used to help describe the location of some other point or object.

A

Reference Point

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7
Q

How fast an object is traveling.

(Direction is not important)

A

Speed

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8
Q

Velocity

A

The speed and direction an object is travelling.

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9
Q

Vector

A

A quantity that has both magnitude and direction.

Example:

Forces are vectors because if you push or pull on something, there is a magnitude (size) of your push, and there is always a direction of your push.

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10
Q

Magnitude

A

How big something is.

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11
Q

Scaler

A

A quantity that has a magnitude (size) but no direction.

Examples:

Temperature. 78 degrees tells you how “big” the temperature is, but there is no direction to 78 degrees.

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12
Q

Is “speed” a scaler or a vector?

A

It is a scaler. Speed has a magnitude (size) but no direction.

Example: 50 mph.

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13
Q

Is velocity a vector or a scaler?

A

Velocity is a vector.

It has both magnitude (size) AND direction.

Example:

Her velocity was 30 mph north.

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14
Q

A quantity that has both magnitude and direction is called a _______________.

Example:

Forces are ________ because if you push or pull on something, there is a magnitude (size) of your push, and there is always a direction of your push.

A

Vector

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15
Q

How big something is.

A

Magnitude

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16
Q

A quantity that has a magnitude (size) but no direction.

Examples:

Temperature. 78 degrees tells you how “big” the temperature is, but there is no direction to 78 degrees.

A

Scaler

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17
Q

Reference object

A

An object that can be used as a reference for both position and for velocity.

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18
Q

In order to describe the position of an object, you must always refer to a ___________ _____________.

A

Reference Point

(or reference object)

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19
Q

In order to describe the velocity of an object, you must always refer to a ___________ _____________.

A

reference object

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20
Q

When you describe the velocity of a car, your typical reference object would be what?

A

The surface of the road beneath the car.

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21
Q

Linear Motion

A

Motion along a line

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22
Q

In motion along a line, what is the difference between the following two “velocities?”

17 m/s

-17 m/s

A

The objects are traveling at the same speed, but in opposite directions.

In linear motion, we can use plus and minus to represent different directions.

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23
Q

In linear motion, how will we show the direction an object is travelling?

A

With a “+” sign or a “-“ sign.

The plus would mean one direction, and the minus would mean in the exact opposite direction.

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24
Q

Position/Time graph

A

A motion graph with “time” on the horizontal axis and “position” on the vertical axis.

This graph shows the motion of 4 objects.

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25
Which object is not moving?
C (did you remember to look at the axes?)
26
Which object is moving the fastest?
A The steepest line on a position/time graph represent the fastest moving object. (A is moving the opposite direction from B and D)
27
Velocity/Time graph
A motion graph with time on the horizontal axis and velocity on the vertical axis.
28
Look carefully at the following graph. Does this show and object that is moving or standing still.
This shows an object that is moving at a very steady speed. [![]()](http://s3.amazonaws.com/brainscape-prod/system/cm/002/046/089/q_image_card.png?1347224568) (Make sure you understand why) (Did you remember to look at the labels on the axes?)
34
What is meant by the acronym: A.U.T.O.graph
When we look at graphs, we will always think about: A - the axes U - the units T - the trace O - the origin
35
When we refer to the "trace" on a graph, we are talking about ...
The best fit line or curve on the graph.
36
*v*
the symbol for velocity
37
*d*
the symbol for distance
38
*P*
the symbol for position (X marks the spot)
39
*t*
The symbol for time
40
Subscript
A letter written smaller and below the rest of the writing. *vt* Here the " *t* " is subscripted
41
the symbol for velocity
*v*
42
the symbol for distance
*d*
43
the symbol for position
*P*
44
The symbol for time
*t*
45
A letter written smaller and below the rest of the writing. *vt* Here the " *t* " is subscripted
Subscript
46
Kinematics
The study of motion
47
Constant Speed
Not speeding up or slowing down
48
The study of motion
Kinematics
49
Instantaneous Speed
How fast an object is going at an instant in time. It is what is shown on the speedometer of a car.
50
Average Speed
A **_single speed_** that can be used to represent an object's speed during a period of time, even if the object is changing speeds.
51
Slope
The angle of a line on a graph
52
How fast an object is going at an instant in time. It is what is shown on the speedometer of a car.
Instantaneous Speed
53
A **_single speed_** that can be used to represent an object's speed during a period of time, even if the object is changing speeds.
Average Speed
54
This is called a
Motion Map
55
The angle of a line on a graph
Slope
56
The formula for calculating the slope of a line.
Slope = rise/run
57
Slope = rise/run
The formula for calculating the slope of a line.
59
Displacement
How far you are from where you started, and in what direction.
60
Distance
How far you have travelled.
75
What is the formula for finding **Average Speed**
76
What quantity is this device used to measure?
Time
77
What quantity is this device used to measure?
Volume
78
What quantity is this device used to measure?
Length
79
What quantity is this device used to measure?
Mass (Note, mass is different than weight) Scales measure weight Balances measure mass
83
True or false. This object is **_moving_** at a constant speed.
False ( I guess zero is a constant speed, but it is not really moving, is it. It just stays at a position of 8 meters from the reference point)
84
In linear motion, the difference between -55 mph and +55 mph is?
Direction only
85
In linear motion, the "+" and the "-" symbols are used to show what?
Direction
86
Which object is moving faster? A car going +10 mph A moped going - 10 mph
Neither. They are both going the same speed, but in different directions.
87
You walk all the way around a typical high school track. Its about 400 meters. Your Distance = \_\_\_\_\_\_\_\_\_\_\_ Your Displacement = \_\_\_\_\_\_\_\_\_\_\_\_\_
Your Distance = \_\_\_\__400-m\_\_\_\_\_\_\__ Your Displacement = \_\_\_\__\_0-m\__\_\_\_\_\_\_\_ Distance is how far you travel. Displacement is how far you end up from the starting point.
88
You are about to go outside to take measurements necessary to calculate your top running speed. What measurements would you need to take.
Distance and Time (because S = d/t )
94
When we make a motion graph, what variable will ALWAYS be on the horizontal axis?
Time (Even if time is the dependent variable, we will always put it on the horizontal axis in motion graphs.)
95
Is **_displacement_** a vector or a scalar?
Displacement is a vector. It has both magnitude and a direction.
96
Is the following a description of a distance or a displacement? He travelled 20 miles North.
Displacement (Magnitude = 20 miles) (Direction = North)
97
Is the following a description of a distance or a displacement? He traveled 30 meters.
Distance It has no direction, so it cannot be a displacement.
99
30 meters is a **_distance_**, so its a **_scalar_** quantity. If you add a direction so it reads 30 meters north, then it becomes \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ which is a \_\_\_\_\_\_\_\_\_\_\_\_\_\_
If you add a direction so it reads ## Footnote 30 meters north, then it becomes **_displacement_** which is a **_vector_**.
100
Time Vector Quantity or not?
Not 3 seconds does not have a direction. No direction, not a vector.
101
Distance Vector Quantity or not?
Not 25 meters does not have a direction. No direction, not a vector.
102
Temperature Vector Quantity or not?
Not 37 degrees does not have a direction. No direction, not a vector.
103
Speed Vector Quantity or not?
Not 50 mph does not have a direction. No direction, not a vector.
104
Velocity Vector Quantity or not?
Vector Quantity 50 mph - North has both magnitude (50) and direction (North). So, its a vector or vector quantity.
105
The definition of "Displacement" is "how far you are from the reference point and in what direction." Displacement can also often be thought of as:
How far you are from where you started. (and in what direction)
106
"Uniform Linear Motion" is just a physicsy way of saying....
"Moving in a straight line at a steady speed."
111
Object "A" has a velocity of -5m/s. Object "B" has a velocity of -3m/s. Object "C" has a velocity of 0 m/s. Which object is moving the fastest?
Object A is moving the fastest. ## Footnote (Both objects are moving in the negative direction. Object "A" is moving at 5m/s, object "B" is only moving at 3m/s. Object "C" isn't even moving, so it is pretty much going the slowest.)
112
Which of the following velocities represents the object travelling most slowly. Car 1 is traveling at -40 mph Car 2 is traveling at 0 mph Car 3 is traveling at +20 mph.
Car 2 is traveling most slowly. (It is not even moving) (Car "1" is traveling the fastest, even if it is moving in the negative direction)
113

Wenger - Physical Science (17 decks)

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