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Physics Test Friday 20th October (Sound (Sound travels in longitudinal…
Physics Test Friday 20th October
Sound
Sound travels in longitudinal waves
Amplitude is the loudness of a sound
Pitch is the frequency of a sound
Sound is the vibration of particles
Ultra sound tooth cleaning
A microphone uses eletrical signals to record sound
Energy
Energy cannot be destroyed
Energy transfers
Radiation
Mechanical
Heating
Electrical
Efficency is useful energy transferred ÷ energy supplied × 100
Different energy stores
Kinetic
Internal ; Thermal, Chemical
Elastic and Gravitational Potential
Magnetic
Electrics
Energy Transferred (kWH) = kW X H
Electrical cost is kWH x pp kWH
Voltage (v) = Current (a) X Resistance (Ω)
Forces
Opposite direction forces subtract form each other
Same direction forces add together
Balanced forces stay at a constant
Unbalanced forces change the motion
Moment(Nm) = force(N) X perpendicular distance (M)
Speed (M/S) = Distance (M) ÷ Time (S)
Lenses
Concave lenses makes a blurred image
Distant objects need a weak lenses
Closer objects require stronger lenses
Pinhole cameras fips an image over
Energy Transfer
Radiation
nuclear
Medical- MRI + Sterilisation
Light
Heat
Conductors get hot quickly
Metals are good at conduction because there are delocalized electrons
Particles are close together in solids
Heat transfers at atomic level with collisions
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