Pressure is in Force per unit area F = Force in N A = Area in m 2 P = pressure in N/m 2 (Pascals - Pa)

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Presentation transcript:

Pressure is in Force per unit area F = Force in N A = Area in m 2 P = pressure in N/m 2 (Pascals - Pa)

Example - a 2.4 kg box measures 15 cm by 25 cm on the base. What is the pressure under the box? F = mg A = LxW 630 Pa

A = (.20 m)(.32 m) =.064 m 2 P = F/A = (42 N)/(.064 m 2 ) 660 Pa What is the pressure of 42 N on a 20. cm x 32 cm plate?

A = LxW A = (.780 m)(1.82 m) = m 2 P = F/A, F = PA = (3200 Pa)( m 2 ) 4540 N What force does 3200 Pa exert on a 78.0 cm x 182 cm pane of glass?

Find area A =  r 2 for a circle Diameter = 2r P = F/A, A = F/P = (31360 N)/(1.38 x 10 6 Pa) A = m 2 A =  r 2 r = m d = 2r.170 m A hydraulic jack lifts a N car using a pressure of 1.38 MPa (M = x 10 6 ) What is the diameter of the cylinder?