Chapter 2 Motion along a line Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

When describing where an object is located at we need to identify the _______ point, the distance, or the direction

A

Reference point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The reference point is called the _______

A

Origin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

To describe the location of something we give its _________ from the place & the direction

A

Distance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

For graphing motion along a line the line of motion is the ___ axis & the origin is x=0 (or just 0) so the position of an object can be describe by its x-coordinate or how far from the origin point

A

X-axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Displacement

A

Is the change of position (final position- initial position) (symbol i delta X)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Velocity

A

Is a quantity with magnitude & direction where the magnitude is the speed that the object is moving

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Velocity depends on both __________ & the time interval

A

Displacement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Average Velocity

A

When a displacement (delta x) occurs over a time interval (delta t) the average velocity during that time interval is delta x divided over delta t

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Since delta t is always ________ the direction of the average velocity ( whether its -/+) depends on the __________

A

Displacement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Average speed is the ______________

A

Total distance traveled divided by the time interval

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Instantaneous velocity

A

Is a quantity where the magnitude i the speed & the direction is the direction of motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

A ________ shows the position of an object over a period of time so its a graphs that x vs t

A

Motion diagram

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

For a graph that deals with displacement (delta X) on the x axis & time (delta T) on the y axis the velocity is the _________

A

Slope

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

In a displacement vs t graph the tangent line is the _____________

A

Instantaneous velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

For a graph that is velocity vs time the _________ is the area under the graph (or the shape formed) ( the units are usually just meters_

A

Displacement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

When finding the displacement with graphs of changing velocity you would have to make smaller ________ for the certain area under the graph and then add up the area of all the shapes formed to get the total displacement

A

Shapes

17
Q

Acceleration

A

The rate of change of velocity (tells you how the velocity is changing)

18
Q

Average acceleration

A

Average acceleration during a time interval is the change velocity divided by the time interval (units is m/s2)

19
Q

To find ____________ acceleration have to calculate the average acceleration during a very short time interval

A

Instantaneous

20
Q

When acceleration & velocity is both in the same direction ( if both are in the positive x-direction or in the negative x-direction) the object is _________

A

Speeding up

21
Q

Only when acceleration & velocity are in the ______ direction when the object is slowing down

A

Opposite

22
Q

When velocity is positive & acceleration is negative the object is moving in the positive x-direction the object is ________

A

Slowing down

23
Q

When velocity is negative & acceleration is positive the object is moving in the positive x-direction the object is ________

A

Slowing down

24
Q

In a graph that is acceleration vs velocity the slope of the graph is the acceleration & the area under the graph is the __________

A

Velocity

25
Q

What are the 4 kinematic equations used when acceleration is constant?

A
  1. delta V= a(delta)T
  2. delta X = ½(Vf + Vi) (delta)T
  3. delta X = Vi(delta)T + ½a(delta T)2
  4. Vf2 - Vi2 = 2a(delta)X
26
Q

How do you calculate average velocity when acceleration is constant?

A

V = ½(Vf + Vi)

27
Q

In free fall its assumed that no other forces act on an object besides __________

A

Gravity

28
Q

An object in free fall has a constant downward acceleration called the ___________

A

Free-fall acceleration (gravity) (g is the symbol) (g=9.80m/s2)

29
Q

When dealing with vertical motion the y-axis is positive pointing upward & negative when pointing downward so in free fall the acceleration is what?

A

a = -g (-9.80m/s2)

30
Q

If an object is moving downward gravity ________ it up & if its moving upwards gravity slows it down

A

Speeds

31
Q

Explain why at the object peek height an object velocity is zero but acceleration isn’t zero?

A

When an object is at its peak height its velocity is zero but acceleration isn’t zero because when an object is thrown upwards its velocity is positive but when its falls back down its velocity is negative so acceleration can’t be zero because its needed to change the velocity

32
Q

When there no acceleration (when it says something travels at constant speed or constant velocity) what equation do you use?

A

delta X = vt (velocity x time)