Forces Flashcards
What is conduction?
Conduction is the transfer of heat energy in a solid by vibration and collision of particles
What is convection?
Convection is the transfer of heat energy when particles in a fluid rise
Radiation
Radiation is the method of transferring energy as a wave
Name 3 simple machines
Lever pulley wheel and axel wedge screw inclined plane
What is diffusion
Diffusion is when particles spread out from an area of high concentration to low concentration
What is a thermal insulator?
A material that reduces how fast energy is transferred between a hot a cold object
What is a thermal conductor?
A material that increases how fast energy is transferred between objects
What is the input force?
The force applied to the machine
What is the output force?
The force applied to the object being moved by the machine
What is a lever?
A simple machine that consists of a rigid object that will rotate around the pivot
What is a pivot?
A fixed point
What is a moment?
A moment is the turning effect of a force
What is the calculation to find the moment
Moment (nm) =force (n) x perpendicular distance (m)
How to convert cm into m
/100
How to convert meters into cm
X100
What is work done
Work done is the amount of energy transferred when a force causes something to be displaced. When a force moves an object energy is transferred and work is done
Calculation for work done
Work done (j)=force (n) x distance (m)
Km into m
Km x 1000 =m
What is displacement
The distance of an object moves from its starting point as measured in a straight line from that point
Arrangement of particles in solids
Ordered lines all touching and vibrating. Strong force of attraction high density
Arrangement of liquids
Random touching particles are moving around eachother weaker than solid attraction weaker than solid density
Arrangement of gas
No touching particles are moving very quickly weak attraction very low density
Particles …… energy as they get …..
Gain. Hotter
As particles …….. energy they move ……
Gain. Faster
Calculation for density
Density = mass/volume
What is the difference between thermal energy and temperature
Temperature is a measure of how hot or cold a substance is . Thermal energy is a measure of the total movement energy in particles
Give an example of an insulator
Wood plastic , polystyrene
Give an example of a material that can conduct thermal energy
Metal
What is infrared radiation
Infrared radiation is a electromagnetic wave That ha da wavelength slightly longer to red light. All hot objects give out infrared radiation
