P2 Pressure Flashcards
How can we calculate area using the pressure equation?
Area = Force ÷ Pressure
How do we calculate pressure?
Pressure = Force ÷ Area
What are the units of pressure?
Newton per metres squared (N/m2)
or
Newtons per centimetres squared (N/cm2)
If your decrease the area that a force is acting over you will ______ the pressure.
If your decrease the area that a force is acting over you will increase the pressure.
Define pressure.
When a force acts over an area.
When you stand on a surface you exert a ______ on the surface.
pressure
How can we calculate force using the pressure equation?
Force = Pressure x Area
If you increase the area that a force is acting over you will ______ the pressure.
If your increase the area that a force is acting over you will decrease the pressure.
What is the force that is acting on the ground where you stand?
Your weight
State the right equation and calculate the force required to exert a pressure of 100N/m2 over an area of 2m2.
force = pressure x area
100 x 2 =
200N
Calculate the pressure if 20N of force is spread over 5cm2 . Give the units.
P = F/A
20/5 = 4 N/cm2
If a force of 50N exerts a pressure of 10 N/cm2 - what is the area? Give the units.
A = F/P
50 / 10 = 5 cm2
What force is needed to exert a pressure of 500 N/m2 over an area of 5 m2? Give the units.
F = P x A
500 x 5 = 2500 N
How many cm2 are there in 1 m2?
100 x 100 = 10,000 cm2
Why does sharpening a knife make it safer to use (describe using pressure, force and area)
A sharp blade a smaller area
This means it can create the same amount of pressure with a smaller force
Using a smaller force is safer
