3rd Book ( Pressure ) Flashcards
What is pressure
Pressure= force
———-
Area
What is force measured in
Newtons
What is pressure defined as
The force (in newtons) per unit area (cm2 or m2)
What is area measured in
Meters square (m2)
What is pressure measured in
N/m2
Newtons/meter squared
Or sometimes cm2
Why can you lie down on a bed of nails without having any nail break your skin, but if you step on a single nail, it will go right through your foot?
The area of a bed of nails is much larger instead of a single nail where all the force is concentrated on one point
What is 1 N/m2 also called?
One PASCAL (Pa)
How is it low pressure
When the weight is spread over a larger area
How is it high/large pressure
When the weight is spread over a small area
What might have high pressure
Stiletto heels
Thumb tach
Pin
Needle
Ice skates with thin blade
Sharp knife
What might have low pressure
Elephant feet
Fat tyres snowshoes
Camels foot
How do you calculate the amount of pressure that you exert on the ground
.
Your force in newtons — area of both feet in cm2 = N/cm2
.
How many newtons are in a kg
1 kg = 10 newtons
What is 50kg in newtons
50 X 10
=500 newtons
If a house weighs 900 newtons and is on a piece of land with an area of 3m by 3m
What’s its pressure
100N/m2
