Kinematics Flashcards
The location of an object in relation to some “reference point”
Position
If an object is not accelerating, you can be absolutely positive that it is experiencing ________________.
Zero Net Force
What would be the net force upon this object?
30 N to the right.
The symbol for time
t
In linear motion, the “+” and the “-“ symbols are used to show what?
Direction
True/False
This fighter jet is in “Free Fall.”
False.
This fighter jet has more forces acting upon it than just gravity. It is experiencing the following forces:
- Gravity
- “Lift” (from the air on the wings)
- “Thrust” (generated by the afterburners)
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
Newton’s Third Law
For every action, there is an equal and opposite reaction.
Newton’s Second Law
A = F/M
(Acceleration = Force divided by Mass)
Acceleration
That rate at which you change your velocity.
Example:
Every second, he was going 5mph faster than the second before.
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.
Vector
What would be the net force upon this object?
10 N to the left.
What would be the net force upon this object?
1 Newton to the right.
Velocity at clock reading = t
<span>v</span>t
A point or exact location that can be used to help describe the location of some other point or object.
Reference Point
Constant Speed
Not speeding up or slowing down
A letter written smaller and below the rest of the writing.
<span>v</span>t
Here the “ t “ is subscripted
Subscript
Newton’s Second Law
A = F/M
(Acceleration = Force divided by Mass)
Another way of saying that someone is accelerating in such a fashion that each second they were going 7 meters per second faster than the second before?
Acceleration = (7 m/s) / s
or
7m/s2
Air Friction
The force impeding the motion of an object traveling through the air.
In motion along a line, what is the difference between the following two “velocities?”
17 m/s
-17 m/s
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.
Reference Point
A point or exact location that can be used to help describe the location of some other point or object.
Mass
How much “stuff” there is in an object.
(or how much matter)
(each added atom or molecule adds mass)
When we refer to the “trace” on a graph, we are talking about …
The best fit line or curve on the graph.
Slope
The angle of a line on a graph
More mass means more ___________.
Inertia
Net Force
The overall force acting upon an object.
True/False
The soccer ball shown in the picture is in “Free Fall.”
True.
It doesn’t matter if the ball is going up, down, or sideways. As long as the only force acting upon the ball is gravity, it is in “Free Fall.”
The size of the force of air friction is dependant upon
______________
and
_______________
The size and shape of an object
and
The speed at which the object is moving relative to the air.
This is called a
Motion Map
Scaler
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.
In order to describe the position of an object, you must always refer to a ___________ _____________.
Reference Point
(or reference object)
Speed
How fast an object is traveling.
(Direction is not important)
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.
Is velocity a vector or a scaler?
Velocity is a vector.
It has both magnitude (size) AND direction.
Example:
Her velocity was 30 mph north.
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.
<span>x</span>0
Position at clock reading = zero
Inertia
VERY close in meaning to “mass”
BUT
Inertia is usually used when you are talking about stopping a moving object or making a stationary object start moving.
True/False
The entire time between when this cannonball
leaves the cannon until it hits the ground,
the cannonball is in
“Free Fall.”
True.
Once it leaves the cannon, the only force acting upon the cannonball is gravity.
x
the symbol for position
(X marks the spot)
Velocity/Time graph
A motion graph with time on the horizontal axis and velocity on the vertical axis.
a
The symbol for acceleration
Vector
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.
Position at clock reading = “t”
<span>x</span>t
The angle of a line on a graph
Slope
<span>v</span>t
Velocity at clock reading = t
the symbol for distance
d
Displacement
How far you are from where you started, and in what direction.
How big something is.
Magnitude
What mathematical calculation would you do to determine the net force upon the skydiver shown here?
Net Force = (Force of Gravity) - (Force of Air Friction)
That rate at which you change your velocity.
Example:
Every second, he was going 5mph faster than the second before.
Acceleration
The symbol for acceleration
a
Change in Momentum and ________ mean the same thing
Impulse
Gravity
A force between any two objects with mass
What would be the net force upon this object?
30 N to the right
All of the red lines are ____________ to the red curve.
“Normal”
(In physics, “normal” means “perpendicular to”)
Velocity
The speed and direction an object is travelling.
What would be the net force upon this object?
10 Newtons to the left.
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)
Which object is not moving?
C
(did you remember to look at the axes?)
Look carefully at the following graph. Does this show and object that is moving or standing still.
What would the net force be upon this object?
2 N to the right
What would be the net force upon this object?
100 Newtons upward
Distance
How far you have travelled.
Position/Time graph
A motion graph with “time” on the horizontal axis and “position” on the vertical axis.
This graph shows the motion of 4 objects.
The blue line could also be consider to be ______________ to the red surface
“Normal”
(In physics, “normal” and “perpendicular” mean the same thing)
True or False
This motorcycle rider is in “Free Fall.”
True.
Once he goes off the jump, the only force acting upon him is the force of gravity. (Until he lands of course)
In which direction would the net force be upon this object?
To the left.
What is the formula for finding
Average Speed
What quantity is this device used to measure?
Time
What quantity is this device used to measure?
Volume
What quantity is this device used to measure?
Length
What quantity is this device used to measure?
Mass
(Note, mass is different than weight)
Scales measure weight
Balances measure mass
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)
What is the picture we use to remember the formula triangle shown?
This is Newton’s Second Law ( Fnet = ma )
What is the picture we use to remember the formula triangle shown?
What is the picture we use to remember the formula triangle shown?
What is the picture we use to remember the formula triangle shown?
