Physics Questions and Answers
Electrical Power =
Current x voltage
Voltage =
Current x resistance
Charge =
Current x time
Average Speed =
Distance / time
Acceleration =
Change in Velocity / Time Taken
Force =
Mass x Acceleration
Pressure Difference =
Height x Density x Gravity
Moment =
Force x Perpendicular Distance from Pivot
Pressure =
Force / Area
Wave Speed =
Frequency x Wavelength
Refractive Index =
Sin (I) / Sin (R)
Sin (Critical angle) =
1 / Refractive Index
Energy Transfer =
Work Done
Work Done =
Force x Distance Moved
Efficiency =
Useful Energy Output / Total Energy Input
Weight =
Mass x Gravity
GPE Potential Energy =
Mass x Gravity x Height
Kinetic Energy =
1/2 x Mass x V^2
Density =
Mass / Volume
Distance Time Graphs
Velocity Time Graphs
Gravity
Force of attraction between all masses
Hooke’s Law
, Extension is directly proportional to force until the spring reaches its elastic limit
Solar Systems
Galaxy = large collection of stars
Sun = one of many stars
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
Types of orbit
Moons and planets have slightly elliptical orbits
Comets orbit the sun, they have very elliptical orbits
Artificial Earth Satellites
Have orbital period of 1 day = geostationary satellites, used for communications
Safety features of Plugs
Filament Lamp
Wire
Resistors
Diodes
Electric Circuit Symbols
Light Dependent Resistor (LDR) Diagram
LDR Explanation
Changes it resistance depending on the amount of light
In bright light the resistance decreases
In dark light the resistance increases
Acts as a light sensor
Thermistor Diagram
Thermistor Explanation
Changes in resistance as temperature changes
In hot condition the resistance decreases
In cool conditions the resistance increases
Acts as temperature detectors
Current
Rate of flow of Charge
Voltage
Driving force which pushes current (Electrical Power)
Resistance
Something which slows down the flow
Circuit Rules
Increase voltage = more current will flow
Increase resistance = less current will flow
Series Circuit
Current the same
Voltage = Voltage of all components
Parallel Circuit
Current = Current of all components
Voltage the same
Transverse Wave Diagram
Electrical Power =
Current x voltage
Voltage =
Current x resistance
Charge =
Current x time
Average Speed =
Distance / time
Acceleration =
Change in Velocity / Time Taken
Force =
Mass x Acceleration
Pressure Difference =
Height x Density x Gravity
Moment =
Force x Perpendicular Distance from Pivot
Pressure =
Force / Area
Wave Speed =
Frequency x Wavelength
Refractive Index =
Sin (I) / Sin (R)
Sin (Critical angle) =
1 / Refractive Index
Energy Transfer =
Work Done
Work Done =
Force x Distance Moved
Efficiency =
Useful Energy Output / Total Energy Input
Weight =
Mass x Gravity
GPE Potential Energy =
Mass x Gravity x Height
Kinetic Energy =
1/2 x Mass x V^2
Density =
Mass / Volume
Distance Time Graphs
Velocity Time Graphs
Gravity
Force of attraction between all masses
Hooke’s Law
, Extension is directly proportional to force until the spring reaches its elastic limit
Solar Systems
Galaxy = large collection of stars
Sun = one of many stars
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
Types of orbit
Moons and planets have slightly elliptical orbits
Comets orbit the sun, they have very elliptical orbits
Artificial Earth Satellites
Have orbital period of 1 day = geostationary satellites, used for communications
Safety features of Plugs
Filament Lamp
Wire
Resistors
Diodes
Electric Circuit Symbols
Light Dependent Resistor (LDR) Diagram
LDR Explanation
Changes it resistance depending on the amount of light
In bright light the resistance decreases
In dark light the resistance increases
Acts as a light sensor
Thermistor Diagram
Thermistor Explanation
Changes in resistance as temperature changes
In hot condition the resistance decreases
In cool conditions the resistance increases
Acts as temperature detectors
Current
Rate of flow of Charge
Voltage
Driving force which pushes current (Electrical Power)
Resistance
Something which slows down the flow
Circuit Rules
Increase voltage = more current will flow
Increase resistance = less current will flow
Series Circuit
Current the same
Voltage = Voltage of all components
Parallel Circuit
Current = Current of all components
Voltage the same
Transverse Wave Diagram
