A LEVEL 3 GCE PHYSICS FINAL PAPER
SOLVED QUESTIONS WITH ACCURATE
ANSWERS
●● Newton's Third Law pairs
Answer: Example: An object exerts a weight of 50N onto the earth. The
third law pair would be that the earth would exert a NCF of 50N on the
object
●● Conditions for Newton's Third Law Pairs to be true
Answer: - Two Different Forces
- Act on the same line
- Same magnitude
- Different objects
- same time
●● Potential Dividers
Answer: A circuit that is used to only output part of the voltage provided
●● Potential Divider equation
Answer: Vout/Vin = R1/R1+R2
,●● Potential Dividers and thermistors
Answer: If a thermistor is used as R1, as temperature decreases
resistance increases and thus Vout increases as they are proportional, this
can be used as a heating system to turn it on if it gets cold enough
●● Potential Dividers and LDRs
Answer: If a LDR is used as R1, as light decreases resistance increases
and thus Vout increases as they are proportional, this can be used for
street lights to be turned on as light decreases
●● Thermistor
Answer: a resistor whose resistance depends on the temperature of the
thermistor
As temperature decreases resistance increases
●● LDR
Answer: Light dependent resistor
As light increases resistance decreases
●● Rheostat
Answer: When a variable resistor is used to control current
,●● Variable Resistor
Answer: A resistor whose value can be varied between its minimum and
maximum values.
●● Variable Resistors and Potential Divider Uses
Answer: A variable resistor can act as a potential divider to act as a
continuous slider to increases or decrease Vout. This can be used as a
dimmer switch
●● Magnetic Flux Density
Answer: a measure of the strength of the magnetic field.
How densely packed lines of flux are equates to how strong a field is
Measures in Tesla T
●● Magnetic Flux
Answer: The total number magnetic field lines that pass through a
surface
= magnetic flux density x Area
, ●● Magnetic Flux Linkage
Answer: The product of the magnetic flux and the number of turns in a
given coil.
= Number of coils x magnetic flux
●● Equations of motion
Answer: v = u + at
s = 1/2(v+u)t
s = ut + 1/2at^2
v^2 = u^2 + 2as
●● Equation of motion for velocity
Answer: v = u + at
●● Equation of motion for distance
Answer: s = 1/2(v+u)t
s = ut + 1/2at^2
●● Equation of motion for velocity squared
Answer: v^2 = u^2 + 2as
SOLVED QUESTIONS WITH ACCURATE
ANSWERS
●● Newton's Third Law pairs
Answer: Example: An object exerts a weight of 50N onto the earth. The
third law pair would be that the earth would exert a NCF of 50N on the
object
●● Conditions for Newton's Third Law Pairs to be true
Answer: - Two Different Forces
- Act on the same line
- Same magnitude
- Different objects
- same time
●● Potential Dividers
Answer: A circuit that is used to only output part of the voltage provided
●● Potential Divider equation
Answer: Vout/Vin = R1/R1+R2
,●● Potential Dividers and thermistors
Answer: If a thermistor is used as R1, as temperature decreases
resistance increases and thus Vout increases as they are proportional, this
can be used as a heating system to turn it on if it gets cold enough
●● Potential Dividers and LDRs
Answer: If a LDR is used as R1, as light decreases resistance increases
and thus Vout increases as they are proportional, this can be used for
street lights to be turned on as light decreases
●● Thermistor
Answer: a resistor whose resistance depends on the temperature of the
thermistor
As temperature decreases resistance increases
●● LDR
Answer: Light dependent resistor
As light increases resistance decreases
●● Rheostat
Answer: When a variable resistor is used to control current
,●● Variable Resistor
Answer: A resistor whose value can be varied between its minimum and
maximum values.
●● Variable Resistors and Potential Divider Uses
Answer: A variable resistor can act as a potential divider to act as a
continuous slider to increases or decrease Vout. This can be used as a
dimmer switch
●● Magnetic Flux Density
Answer: a measure of the strength of the magnetic field.
How densely packed lines of flux are equates to how strong a field is
Measures in Tesla T
●● Magnetic Flux
Answer: The total number magnetic field lines that pass through a
surface
= magnetic flux density x Area
, ●● Magnetic Flux Linkage
Answer: The product of the magnetic flux and the number of turns in a
given coil.
= Number of coils x magnetic flux
●● Equations of motion
Answer: v = u + at
s = 1/2(v+u)t
s = ut + 1/2at^2
v^2 = u^2 + 2as
●● Equation of motion for velocity
Answer: v = u + at
●● Equation of motion for distance
Answer: s = 1/2(v+u)t
s = ut + 1/2at^2
●● Equation of motion for velocity squared
Answer: v^2 = u^2 + 2as
