# Acceleration vs Time Graph

1. Nov 13, 2007

### Khemkhajon

If a object was heading towards the orgin while slowing down. How would the a vs t graph look. I keep thinking it would be a positive acceleration line, but Im not sure wondering if anyone could clarify

2. Nov 13, 2007

### tyco05

If it is slowing down, what does that say about the acceleration?

An a-t graph plots acceleration. It doesn't matter if the object is moving towards the origin or away from it.

3. Nov 13, 2007

### Khemkhajon

Thats not true. Because if they gave you a x vs t graph of a object heading towards the orgin and speeding up the acceleration would still be negative because of the slope

4. Nov 13, 2007

### tyco05

What exactly do you mean by this?

If something is speeding up, the slope of the v- t graph is positive. Hence the acceleration is positive.

5. Nov 13, 2007

### Khemkhajon

Think of it as ball rolling down a ramp. it starts at 50m-----------ends at 0m

6. Nov 13, 2007

### tyco05

Hmmm.... maybe you mean speeding up in a negative direction?
In that case your statement is correct.

7. Nov 13, 2007

### Khemkhajon

so back to the question if its speed was negative and starts to slow down what would the a vs t be?

8. Nov 13, 2007

### tyco05

Maybe you're mixing up your horizontal and vertical components....

9. Nov 13, 2007

### tyco05

if the velocity is in a negative direction and it is slowing down then the acceleration is in the positive direction.

10. Nov 13, 2007

### Khemkhajon

o ok thankyou

Last edited: Nov 13, 2007