# Homework Help: Physics resistance force question (Newton's Laws)

1. Oct 2, 2011

### modis15

1. The problem statement, all variables and given/known data
If a 25kg mass has a constant velocity of 5m/s, when pushed horizontally by a 5 N force, what amount of resistance force is present?

2. Relevant equations
F=ma

3. The attempt at a solution

I'm pretty sure the velocity is irrelevant, ... I made a diagram but that didn't help much. I'm not sure exactly what it is asking, aka I don't know what resistance force is or how to find it. I'm not sure where to start so any help would be appreciated!!!

2. Oct 2, 2011

### grzz

What are the horizontal forces on the mass?

3. Oct 2, 2011

### modis15

Just the 5 N right?

4. Oct 2, 2011

### grzz

Is the mass accelerating?

5. Oct 2, 2011

### modis15

No, it doesn't have any acceleration.

6. Oct 2, 2011

### grzz

Therefore it cannot have only the 5n force acting on it because otherwise it will acc.

7. Oct 2, 2011

### modis15

Ooohhh, I think I see what you're getting at. The resistance force must be 5 N also, right?

Last edited: Oct 2, 2011
8. Oct 3, 2011

### grzz

Correct! Now you ARE thinking.
Physics becomes easy... when you think enough.
Now draw a diagram showing the forces and continue.