Forces Flashcards
What can the equation of force be written as?
F
P= _ = Newtons/metre2 or Pascals
A
Show the pressure triangle
/ \
/ F \
/— \
/P x A\
What is biomass?
Any mass that comes from a living thing
How do you test for oxygen?
A glowing wooden splint relights in a test tube of oxygen
How do you test for carbon dioxide?
A lit wooden splint goes out in a test tube of oxygen
Bubble gas through a limewater {calcium hydroxide solution} If it’s carbon dioxide the limewater will turn cloudy white
How do you test for starch?
Starch turns red to black when tested with Iodene solution
What is a hydraulic system?
In a hydraulic system you transmit a force from one point to another via an incompressible liquid
What can we do using a hydraulic system?
Using a hydraulic system you can increase a force applied to a particularly area
What happens when gases are compressed?
When gases are compressed the particles bump against each other and so the pressure rises
Where does pressure come from?
Pressure comes from particles bumping against other particles. Air pressure comes from gas particles bumping against things like trees or buildings, even people
If you’re higher up in the atmosphere what happens to the air pressure and why?
The higher up in the atmosphere the lower the air pressure because there isn’t anything for the gas particles to bounce off to create air pressure
What is a lever and what does it do?
A lever is a rigid bar resting on a pivot used to move a heavy or firmly fixed load with one end when pressure is applied to the other
Give four examples of a lever
Scissors Doors Light switches Windows Wheel barrow Cranes
What is a turning force?
A turning force is described as a force multiplied by the distance the force is away from the point of turning {pivot} it must be at right angles
What is the proper name for the turning point
The pivot
How do you work out the turning force?
Turning force = Force X Distance
How can forces move objects?
Forces can move objects by turning them around a pivot
What is a long bar that pivots called?
A lever
When you push down on one side of a lever what are you doing and what will happen to the object on the other end? {the load}
When you push down on one side you are applying force. The object on the other end {the load} moves up.
What does using s lever do?
Using a lever magnifies the force making objects easier to use
What is the turning force measured in?
The turning force is measured in Nm {newtons/meter}
What is the equilibrium?
Equilibrium is where the overall moment is 0
What is the moment?
The turning effect of a force is known as the moment
If the total anti-clockwise moment is equal to the total clockwise movement then what is the turning force?
If the total anti-clockwise moment is equal to the total clockwise movement then the turning force is balanced
What is pressure?
Pressure is the force over a specific area.
What unit is used to measure pressure?
Newtons per square meter
A force of 10N acts upon an area of 2m squared. What would the pressure be?
5 N/m squared
Can liquids be compressed?
Liquids cannot be compressed
Can gases be compressed?
Gases can be compressed.
If more gas particles are added to a container, is the pressure increased or decreased?
The pressure is increased if more gas particles are added to a container
