Section 1
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Effects of gravity on planets
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Last updated
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Date created
Mar 1, 2020
Cards (68)
Section 1
(50 cards)
Effects of gravity on planets
Closer you get to a star or a planet the stronger the force of attraction is, so they move quicker in orbit
Charge =
current x time
Voltage
Driving force which pushes current (Electrical Power)
Gravity
Force of attraction between all masses
GPE Potential Energy =
Mass x Gravity x Height
Energy Transfer =
Work Done
Uses of Waves
Radio Waves: Communication Microwaves: Satellite Communication Infra-Red Radiation: Heating and monitor temperature Visible Light: Travel though optical fibres + Photography Ultraviolet Light: Fluorescent Lamps X-Rays: See inside things Gamma Rays: Sterilising medical equipment
Force =
Mass x Acceleration
Wire
Distance Time Graphs
Voltage =
current x resistance
Wave Info
All waves transfer energy and information without transferring matter
Transverse Wave
Vibrations are at 90° to the direction energy is transferred
Resistors
Weight =
Mass x Gravity
Refractive Index =
Sin (I) / Sin (R)
Diagram of Electromagnetic Waves
Series Circuit
Current the same Voltage = Voltage of all components
Examples of Transverse Waves
Electromagnetic Waves Ripple in Water
Light Dependent Resistor (LDR) Diagram
Electrical Power =
current x voltage
Longitudinal Wave Diagram
Parallel Circuit
Current = Current of all components Voltage the same
Resistance
Something which slows down the flow
Average Speed =
distance / time
Moment =
Force x Perpendicular Distance from Pivot
Types of orbit
Moons and planets have slightly elliptical orbits Comets orbit the sun, they have very elliptical orbits
Kinetic Energy =
1/2 x Mass x V^2
Acceleration =
Change in Velocity / Time Taken
Filament Lamp
Longitudinal Waves
Vibrations are parallel to the direction the wave transfers energy
Work Done =
Force x Distance Moved
Pressure Difference =
Height x Density x Gravity
Transverse Wave Diagram
Electric Circuit Symbols
Efficiency =
Useful Energy Output / Total Energy Input
Wave Speed =
Frequency x Wavelength
Velocity Time Graphs
Circuit Rules
Increase voltage = more current will flow Increase resistance = less current will flow
Examples of Longitudinal Waves
Sound + Ultrasound Shock Waves
Conduction
Process where vibrating particles pass on their kinetic energy (by touch)
Current
Rate of flow of Charge
Hookes Law
Extension is directly proportional to force until the spring reaches it's elastic limit
Electromagnetic Waves
Waves have different wavelengths - continuous spectrum All transverse - Travel at same speed through a vacuum
Pressure =
Force / Area
Solar Systems
Galaxy = large collection of stars Sun = one of many stars
Artificial Earth Satellites
Have orbital period of 1 day = geostationary satellites, used for communications
Diodes
Sin (Critical angle) =
1 / Refractive Index
Density =
Mass / Volume
Section 2
(18 cards)