physics pressure Flashcards
1
Q
What are the units of Force?
A
Newtons (N)
2
Q
What are the units of Area?
A
mm2 , cm2 or m2
3
Q
What are the units of Pressure?
A
N/mm2 , N/cm2 or N/m2 And Pascals (Pa)
4
Q
What is the relationship between Pressure, Force and Area?
A
Pressure = Force
Area
5
Q
What is the equation for Pressure is a liquid?
A
Pressure = height X density X gravity
6
Q
A box which weighs 12N is placed on a table. The area in contact with the table is 24 cm2 . Calculate the pressure the box exerts on the table.
A
P= F/A P = 12/24 P= 0.5N/cm2
7
Q
A box which weighs 1000N is placed on a table. The area in contact with the table is 2m2 . Calculate the pressure the box exerts on the table.
A
P= F/A P = 1000/2 P= 500N/cm2
8
Q
What is the pressure exerted by a girl of mass 40kg standing on 1 stiletto heel of area 2cm2
A
First calculate the Weight force: F= m x g F =40 X 10 F= 400N – now find the Pressure P= 400/2 = 200N/ cm2
