# Need help with a force vs time graph.

1. Nov 30, 2007

### Bensky

[SOLVED] Need help with a force vs time graph. :(

1. The problem statement, all variables and given/known data
Which interval in Fig. MC3 corresponds to the greatest change in the speed of the body?

Figure MC3 is above.

a) 1-2s
b) 0-1s
c) 2-3s

2. Relevant equations

None

3. The attempt at a solution

I figured out that 1-2s has the greatest slope of the three, would that indicate that it has the greatest change in speed? It seems logical to me but I don't really understand this graph, so I don't want to guess and get the wrong answer (this is my last try to get it right). It seems like it would be really simple.

#### Attached Files:

• ###### 4-MC3.gif
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2. Nov 30, 2007

### Staff: Mentor

Wrong. What is the fundamental equation that relates force, mass and acceleration?

3. Nov 30, 2007

### OJones

berkeman has it quite correct. Look at the relationship between force and rate of change of velocity (acceleration).

P.S. strictly this should be rate of change of momentum, but I won't confuse the issue ;-)

Edit: also, are you sure that the 1-2 second interval has the highest slope (gradient)? Look carefully.

Last edited: Nov 30, 2007
4. Nov 30, 2007

### Bensky

Thank you. :) solved