# Motion in 1 dimension

1. Mar 10, 2016

### _Reza_

1. The problem statement, all variables and given/known data
Identify the motion that the different sections of the graph describe

2. Relevant equations

3. The attempt at a solution
t=0-2 is accelerating
t=2-4 is stationary
t=4-5 accelerating
t=5-9 decelerating/slowing down

Options which are given: Constant speed, moving back to the start position and the above. Is my solution correct?

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2. Mar 10, 2016

### Staff: Mentor

First things first: On such a diagram, what would a constant speed motion look like? What aspect of the diagram tells you the speed? Then: What would acceleration look like?

3. Mar 10, 2016

### _Reza_

well since the distance is changing over time, that must imply that the object is moving hence for t= 0-2 it is accelerating. Now for t=2-4 distance is not changing therefore it must be stationary. for t=4-5 and t=5-9 the object is accelerating but the first interval (t=4-5) is accelerating faster than the other (t=5-9) . My confusion is that they had provided other possible answers which i have stated, but i can not see any constant acceleration in that diagram

4. Mar 10, 2016

### Staff: Mentor

Yes, during that time the object is moving. But moving does not mean accelerating. What's the definition of acceleration?

5. Mar 10, 2016

### _Reza_

the rate of change of velocity over time, does that mean the object is moving in constant speed?

6. Mar 10, 2016

### Staff: Mentor

Exactly!

So what would a graph of constant velocity look like?

7. Mar 10, 2016

### _Reza_

Graph that shows distance and time, so distance/time= constant speed. so the different intervals were the distance is changing, is the objects always at constant speed?

8. Mar 11, 2016

### Staff: Mentor

Tell me what such a displacement vs time graph looks like. Would it be straight lines, curved lines, flat lines, what?

How would you draw a graph of the motion of an object moving at constant speed?