Please enable JavaScript.
Coggle requires JavaScript to display documents.
Physics Revision (Motions and graphs (Distance Graphs 1 (Diagonal line =…
Physics Revision
Motions and graphs
Distance is how far you have travelled
Displacement is distance in a given direction
S = D/t
Vector
Velocity
Force
Displacement
Scalar
Speed
Time
Distance
Distance graphs 2
Slope getting steeper = acceleration
Distance Graphs 1
Diagonal line = Constant speed
Steeper diagonal line = Faster constant speed
Horizontal line = Stopped
Diagonal line downwards = Going back to start
Energy Types
Increasing efficiency
Insolation
Lubrication
Aerodynamic
Different material
Power = Energy transfer / Time taken = Work Done / Time taken
P=E/t
Efficiency
Efficiency = Usefull energy X 100% / Total energy in
Work Done
Work done (J) = Force (N) X Distance moved (m)
Kinetic energy
Kinetic energy (J) = 1/2 X Mass (Kg) X Velocity Squared (m/s)2
Ek = 1/2 X m X v2
GPE(J) = m()Kg X g (N/kg) X h (cm)
Waves
All waves
Frequency (Hz) = Speed of wave (m/s) / Wavelength (m)
Experiment
Set up ripple tank
pour water 5mm in tank
adjust height of rod so it just touches water
adjust the speed: Low frequency
Adjust height of lamp
Put ruler at right angle to waves on card
count waves passing a point over a period of time
calculate speed
Types
Longitudinal
E.g. Sound Directions
Displacement
Parallel
Transverse
E.g Sea water
Displacement
Right angles
Higher Amplitude
Light is brighter
Sound is louder
Amplitude
How hight the wave is
Wavelength
The same point on two adjacent waves
Frequency
Number of complete waves / oscillations per second
Density
volume = L X H X W
Floating
The wood block would float because it is less dense than water
The metal block will sink because it is more dense than water
Density = mass/Volume
Refraction
Less to more dense
speed increases so bends towards normal
At the normal
Slows down but no change
More to less dense
Speed increases so bends away
Velocity Graphs
a (m/s2) = v - u(Starting velocity) (m/s) / t(s)
