Forces (Brett) Flashcards
3 Types of a force
Push/Pull/Twist
Reaction force
A force when more force is applied, more force is given back
Newtonmeter
a scale that measure force in newtons
Relationship with newtons and weight
The more newtons, the heavier
Friction
The force you get when two materials rub together
Air resistance
The force that holds the particles in an atom’s nucleus together
Gravity
The force that exists between all objects with mass
Tension
The force you get when a material is being stretched
Compression
The force you get when a material is being squashed
Magnetism
The force that enables compasses to work and attracts metals like iron
Electrostatic
The force you get between two electrically charged objects
Nuclear
The force that holds the particles in an atom’s nucleus together
How does an object move
If forces are unbalanced
accelerate
increase of speed
decelerate
Decrease of speed
Where do levers turn
Around a fixed point/turning point/pivot
Moment
A turning force that is measured in Newtons that with distance measured in meters
How to increase a moment
increase the force applied to increase the distance from the pivot
Moment equation
Moment (Nm) = Force (N) X Distance (M)
Measurement that moments
Nm (Newton meters)
Lever purpose
Levers are force multipliers that reduce the force needed to perform tasks
law of moments
When an objects is not turning around a pivot, the total clock-wise moment must be exactly balanced by the total anti-clockwise moment
When opposing moments are balanced
Sum of clockwise moments = sum of anti-clockwise moments = equilibrium
Equation for two moments
F1 X D1 = F2 X D2
Pressure measurement
a measure of how much force is applied over a certain area
What direction does pressure act
90˚ to the surface
Pressure equation
Pressure (N/M2) = Force (N) ÷ Area (M2)
Pressure def
pressure is force of moving particles colliding with a barrier, particles both collide internally and externally
Solid particle arrangement
All atoms are the same size, regular arrangement, compact, particles vibrate around a fixed point
Liquid particle arrangement
Atoms are the same size, irregular arrangement, liquid can flow, particles can flow over each other, not fixed
Gas particle arrangement
Particles are spread out and fill any volume of a container
Relationship with pressure and altitude
The lower the altitude, the more pressure since more layers of particles are pushing down
How is pressure caused
Collisions of particles
2 factors that effect pressure
quantity and temperature
relationship with the 2 factors and pressure
the more the quantity of particles or the higher the temperature the higher the pressure
Mass
how much matter something has
Volume
How much space something takes up
Density
The amount of particles/atoms in a certain volume of confined space
Millimetres
On tenth of a centimeter
Density equation
Density (Kg/M3) = Mass (Kg) ÷ Volume (M3)
