# Help With Free Fall

1. Jan 4, 2010

### MCSPT117

The problem statement, all variables and given/known data[/b]
Problem: How much Air Resistance acts on a 100-N bag of nails that falls at its teminal speed?

What process do you use to solve this?

2. Jan 4, 2010

### rock.freak667

At terminal velocity the resultant force on it is zero, so find the expression for the resultant force and equate to zero.

3. Jan 4, 2010

### jegues

What have you tried so far? Do you understand the properties behind terminal speed?

4. Jan 4, 2010

### MCSPT117

Nothing.
I'm asking if I need to use F=ma to solve this. And if I do, where are each of the numbers plugged in?

5. Jan 4, 2010

### jegues

This should be more than enough for you to solve the problem.

Make some attempts and if you're still stuck we'll go from there.

6. Jan 4, 2010

### MCSPT117

???
Still don't know what to do? How do you find the expression for the resultant force?

7. Jan 4, 2010

### jegues

To obtain an expression for the resultant force you have to understand what the resultant force is! ;)

The resultant force is what you get when you sum up all the forces acting on a given object.

What forces are acting on the object?

8. Jan 4, 2010

### MCSPT117

Air resistance, and gravity are the forces acting on the object, right?

9. Jan 4, 2010

### Nerdy3.141592

Fg (Force of Gravity) - Ff (Force of Friction) = Fr (Resultant Force)