TRYING TO CRAM ENTIRE SYLLABUS Flashcards
Density formula
Density = Mass (Kg) / Volume (m^3)
Symbol for density
Looks like a p (called “rho”)
Force
A force is a push or a pull that acts on an object due to the interaction with another object
Object will continue at uniform velocity if…
Net force = 0
Force
A force is a push or pull upon an object resulting from its interaction with another object
Resultant force
A single force that has the same effect as all of the
original forces acting together
How to calculate resultant force in Vector Diagram
Draw using a scale (e.g. 1N = 1cm) the 2 forces using a ruler and the appropriate angle in between. Then finish the parallelogram.
Moment
The turning effect of a force
Moment formual
Force (N) x Perpendicular Distance (m)
Moment Unit
Nm (Newton meter)
Momentum formula
Mass x Velocity
What is momentum and it’s unit
Force gained by motion or a series of events. It’s symbol looks like a p (“rho”) and its unit is kgm/s
The conservation of momentum principle
In a closed system,
the total moment before an event is = to the total momentum after the event
Impulse
A change in momentum
Formula to calculate force required to accelerate an object to a certain velocity in a certain time
Change in momentum / Time
Specific Heat Capacity
The amount of energy required to raise the temperature of 1kg of the substance by 1 degrees C
Change in thermal energy formula
Change in thermal energy (J) = mass x specific heat capacity x temperature change
Internal energy
Total energy stored inside a system by the particles
What does it tell us when the line becomes flat in a heating and cooling graph?
The material is changing state because the energy being put in (heat) is being used to break the forces of attraction between the particles instead of continuing to go up in temperature.
Change from Gas to Liquid is called….
Condensation
Specific Latent Heat
The specific latent heat of a substance is the amount of energy required to change the state of one kg of the substance with no change in temperature. Or simply, how much energy is involved in the changing of state stage.
Specific latent heat of fusion
The energy required to change 1kg of a substance from a solid to a liquid with no change in temperature
Specific latent heat of vaporisation
The energy required to change 1kg of a substance from a liquid to a vapor with no change in temperature
Formula for calculating the energy required for a change of state
Energy for a change of state = mass x specific latent heat
If the input and output forces are on different sides of the pivot then
they will act in different directions
Gears allows what
The turning effect to be transmitted (e.g. from Engine to wheels)
