# Pressure from contact surface

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1. Nov 2, 2014

### Nerikk

1. The problem statement, all variables and given/known data
The object has a mass of 10 Kg. And it has a contact surface of 25 cm^2. How much pressure do the object apply to surface? Give your answer is Pascals.

2. Relevant equations
N

3. The attempt at a solution
So, I think I need to divide the mass with with the surface area to get kilogram-force per squared centimeter. Then I need to convert it into Pascals. But how do I convert it to Pascals? Is there a formula?

2. Nov 2, 2014

### elegysix

The first step is to find the force. What is the force due to gravity? (F=?)

one pascal is 1 N/m^2. so you need to use newtons and meters. This means convert cm^2 to m^2.

Then you can use the definition of pressure (Pressure = Force/area), and your answer will be in pascals.

3. Nov 2, 2014

### Nerikk

Since Englsih isn't my first language so I had a bit of a hard time to understand, but I think I got it.
F=m*g
F=10kg*9,78=97,8N
Then 25cm^2=0,4m^2
97,8 N per 0,4m^2
Pascal=97,8 N / 0,4m^2 = 244,5 Pa
Pascal=244,5
How is that?

4. Nov 2, 2014

### elegysix

1 cm = 1/100 m, and 1 cm^2 = (1/100)^2 m^2 = 1/10000 m^2. therefore 25 cm^2 = ?
hint: it is not 0.4m^2