1. Pressure

2. Don’t just stand there watching!
What is pressure?
Don’t just stand there watching!
LIFT!
… oh my, I’m seeing spots!
It’s squashing me!
Arghhh!

3. Pressure Don’t try this at home!!!! OUCH????
Why doesn’t this hurt? Think about the words pressure, force/weight and area.
OUCH????

4. Pressure
Why didn’t the balloon POP!!????

6. Why do you think my feet are wide?

7. Why are snow shoes used for walking in really deep snow?

8. My skis are flat at the bottom to stop me sinking but they also have a sharp edge to dig into hard snow. Explain how these 2 uses of my skis work.

9. Why are ice skate blades
sharp?

10. Why are dart tips pointed?

11. Why does a sharp knife cut better
than a blunt knife?

12. Jo weighs 500 N and is wearing stiletto heels
which together have an area of m2.
What pressure does she exert?
2. Dumbo the elephant weighs N. His 4 feet
are on the ground and cover a total area of 0.8 m2.
What is the pressure under an elephants feet?
3a) Who exerts the larger force and who exerts the larger
pressure? Jo or the Dumbo. Explain how you know.
3b) Who would sink further into the ground. Jo or Dumbo?
5. If atmospheric pressure
is N/m2 what
force is exerted on a wall of
area 100 m2?
4. A Christmas present weighs 100 N and its base
has an area of 2 m2. What pressure does it
exert on the ground?

13. Pressure 500 N/m2 0.5 N/cm2 5 cm2 Around 1 kg per cm2!
Calculate the pressure exerted by a 1000 N elephant when standing on the floor if his feet have a total area of 2 m2.
A brick is rested on a surface. The brick has an area of 20 cm2. Its weight is 10 N. Calculate the pressure.
A woman exerts a pressure of 100 N/cm2 when standing on the floor. If her weight is 500 N what is the area of the floor she is standing on?
(Hard!) The pressure due to the atmosphere is 100,000 N/m2. If 10 newtons are equivalent to 1 kg how much mass is pressing down on every square centimetre of our body?
500 N/m2
0.5 N/cm2
5 cm2
Around 1 kg per cm2!
30/11/2018