Chapter 11 Force And Pressure Flashcards
11.1 Pressure Equation
Force (N) / Area (m^2)
11.1 Why do shoes on ice need to have big surface areas
It is to spread the weight and decrease the pressure in order for it to not make any cracks
11.1 Why are knives sharp?
They have a very small surface area so they will pierce whatever it touches.
11.2 Pressure in a liquid equation
Pressure = height x density x volume
11.2 What happens to the pressure when you increase the depth
The pressure increases
11.2 The practical with the water bottle filled with water shows…
If you increase the depth there is more pressure as the water shoots out the most.
11.4 What is upthrust
It is an upward force on the object due to the fluid.
11.4 What causes upthrust
Pressure of the liquid.
11.4 An object floats when its weight is …. to upthrust
Is equal to upthrust
11.4 An object sinks when its weight is …. than the upthrust
Greater than the upthrust
11.3 pressure AT SEA LEVEL equation
Height x density x gravity
11.3 How is pressure created?
When air molecules collide and create pressure.
11.3 What happens to the density of an object when the altitude increases
The density decreases
11.3 Why does atmospheric pressure decrease when the altitude increases.
There is less air above a given altitude than there is at a low altitude.
11.2 The greater the density of a liquid, the _______ the pressure of a liquid
The GREATER the pressure of a liquid
