Need help with the interpretation of this v(t) graph

[gladidi]

Summary:: Please tell me an example

Determine the distance traveled by the object between 0-7 s.

Determine the acceleration of the piece in the range of 0-4 s
Determine the acceleration of the piece in the range of 4-7 s.I've tried, but something I'm doing wrong. Could you clarify?

 

[berkeman]

Welcome to PF.

You need to show us your work before we can help you with this. How is the velocity as a function of time related to the position and acceleration as a function of time? How can you use that to help you solve these questions?

 

[gladidi]

Welcome to PF.

You need to show us your work before we can help you with this. How is the velocity as a function of time related to the position and acceleration as a function of time? How can you use that to help you solve these questions?

This is the work.

 

[berkeman]

This is the work.

No, that is the graph you are supposed to use to figure out those 3 questions.

Please answer this:

How is the velocity as a function of time related to the position and acceleration as a function of time?

 

[gladidi]

No, that is the graph you are supposed to use to figure out those 3 questions.

Please answer this:

I've tried to solve it with a chart, but the answers aren't going right

 

[berkeman]

You didn't answer my questions. Until you do that, you will not get very far on problems like this one...

 

[berkeman]

How is velocity defined in terms of position and time?

How is acceleration defined in terms of velocity and time?

 

[robphy]

Summary::
I've tried, but something I'm doing wrong. Could you clarify?
View attachment 288876

What specifically did you try?

I've tried to solve it with a chart, but the answers aren't going right

What approach with a chart did you try?
What were your answers
and how did you get them, specifically?

 

[gladidi]

What specifically did you try?What approach with a chart did you try?
What were your answers
and how did you get them, specifically?

> Determine the acceleration of the piece in the range of 0-4 s

< 12/4

 

[robphy]

> Determine the acceleration of the piece in the range of 0-4 s

< 12/4

Ok, that's a start.
Why 12/4?

 

[gladidi]

Ok, that's a start.
Why 12/4?

Speed change / time to change

 

[gladidi]

Ok, that's a start.
Why 12/4?

Acceleration formula

 

[robphy]

Speed change / time to change

That sounds like a slope.
What is the speed-change [although velocity-change is more correct], during the time-change?

 

[haruspex]

Speed change / time to change

What is the speed at t=0s?
What is the speed at t=4s?
What is the change in speed?

 

[gladidi]

What is the speed at t=0s?
What is the speed at t=4s?
What is the change in speed?

Speed at t=0s =0?
Speed at t=4s? =12?

 

[haruspex]

Speed at t=0s =0?

Not according to the graph.

 

[gladidi]

Not according to the graph.

It is 3?

 

[haruspex]

It is 3?

Yes.

 

[gladidi]

Yes.

finally i got this right..

 

[gladidi]

What is the speed at t=0s?
What is the speed at t=4s?
What is the change in speed?

How solve this? Determine the acceleration of the piece in the range of 4-7 s.

 

[haruspex]

How solve this? Determine the acceleration of the piece in the range of 4-7 s.

Same process. What was the increase in velocity in that interval?

 

[gladidi]

Same process. What was the increase in velocity in that interval?

4 and 7 have same speed 12?

 

[haruspex]

4 and 7 have same speed 12?

Yes, so what was the increase in speed?

 

[gladidi]

Yes, so what was the increase in speed?

24?

 

[haruspex]

24?

If you are earning $20 an hour and that changes to $20 an hour, how much is your pay rise?

 

[haruspex]

I give up

 

[gladidi]

If you are earning $20 an hour and that changes to $20 an hour, how much is your pay rise?

0...

 

[haruspex]

0...

Right.
So what is the speed increase from t=4s to t=7s?

 

[gladidi]

Right.
So what is the speed increase from t=4s to t=7s?

Answer is 0..

 

[gladidi]

The last point is to calculate the distance traveled by objects.
it is said that should calculate the surface area