OCR A - A Level Physics
What six base units of the SI system are used in A Level Physics? - ANSWER
metre, kilogram, second, Ampere, Kelvin, Mole
What six base quantities of the SI system are used in A Level Physics? - ANSWER
length, mass, time, electric current, absolute temperature, amount of substance.
What is the value of the prefix T (tera) - ANSWER 10¹²
What is the value of the prefix G (giga) - ANSWER 10⁹
What is the value of the prefix M (mega) - ANSWER 10⁶
What is the value of the prefix k (kilo) - ANSWER 10³
What is the value of the prefix d (deci) - ANSWER 10⁻¹
What is the value of the prefix c (centi) - ANSWER 10⁻²
What is the value of the prefix m (milli) - ANSWER 10⁻³
What is the value of the prefix μ (micro) - ANSWER 10⁻⁶
What is the value of the prefix n (nano) - ANSWER 10⁻⁹
What is the value of the prefix p (pico) - ANSWER 10⁻¹²
What is the accuracy of measurements? - ANSWER How close a measurements
are to the true value.
What is the precision of measurements? - ANSWER How close to each other
repeated measurements are.
What is measurement error? - ANSWER The difference between the measured
value and the true value of the quantity.
What are random errors? - ANSWER Measurement errors that occur due to results
varying in an unpredictable way.
What is the main method for correcting for random errors? - ANSWER Taking
repeated measurements and finding the mean.
What are systematic errors? - ANSWER A measurement error that causes the
measurements to differ from the true value by a consistent amount for each
measurement.
,What is a zero error? - ANSWER A systematic error that arises from an instrument
reading reading a non-zero reading when nothing is being measured.
What is an absolute uncertainty? - ANSWER The interval around the measured
value within which the true value is expected to lie.
What is a percentage uncertainty? - ANSWER The absolute uncertainty stated as a
percentage of the measured value.
How do you combine uncertainties when measurements are added or subtracted? -
ANSWER Add together the absolute uncertainties.
How do you combine uncertainties when measurements are multiplied or divided? -
ANSWER Add together the percentage uncertainties.
What happens to the uncertainty in a measurement when it is raised to a power? -
ANSWER The percentage uncertainty is multiplied by the power.
What is a scalar quantity? - ANSWER A quantity with magnitude but no direction.
What is a vector quantity? - ANSWER A quantity with magnitude and direction.
When adding two perpendicular vectors what can you use to find the direction of the
resultant? - ANSWER Pythagoras' Theorem
When adding two perpendicular vectors what can you use to find the magnitude of
the resultant? - ANSWER Trigonometry
What is vector resolution? - ANSWER The process of splitting a vector into two
perpendicular components.
What is a resultant vector? - ANSWER The sum of two or more individual vectors.
How is the resultant found in a vector diagram when adding several vectors
together? - ANSWER Join the vectors nose to tail and the resultant is from the tail
of the first to the nose of the last vector.
What is displacement? - ANSWER The distance of an object from a point in a
specific direction (vector)
What is velocity? - ANSWER Rate of change of displacement (vector) ∆s/∆t if
constant
What is speed? - ANSWER Change in distance traveled per unit time (scalar)
What is acceleration? - ANSWER Rate of change of velocity (vector) ∆v/∆t if
constant
What are the units of acceleration? - ANSWER ms⁻²
, What is meant by constant velocity? - ANSWER Speed and direction of motion
don't change
What is represented by the gradient of a distance-time graph? - ANSWER Speed
What is represented by the gradient of a displacement-time graph? - ANSWER
Velocity
What is represented by the gradient of a velocity-time graph? - ANSWER
Acceleration
What is represented by the area under a velocity-time graph? - ANSWER Change
in displacement
What is represented by the area under an acceleration-time graph? - ANSWER
Change in velocity
When can the suvat equations by used? - ANSWER When there is constant
acceleration and motion along a straight line.
What is the effect of mass on the acceleration for an object in free-fall? - ANSWER
None
What is the relationship between displacement and time for an object falling freely
from rest? - ANSWER Displacement is proportional to time squared (sαt²)
What is a projectile - ANSWER An object acted upon only by the force of gravity
What shape is the path of a projectile? - ANSWER Parabolic
What is the initial vertical velocity of an object projected horizontally? - ANSWER
Zero
What angle of projection that results in maximum range - ANSWER 45°
Ignoring air resistance what is the acceleration of a projectile? - ANSWER Always g
downwards
How does horizontal velocity vary in projectile motion? - ANSWER It is constant
If a projectile returns to its starting height - ANSWER Initial and final velocities have
the same magnitude
What equation used for the horizontal component of projectile motion? - ANSWER
Displacement = Velocity x time (since horizontal velocity is constant)
What aspect links the vertical and horizontal motion of a projectile - ANSWER Time
taken to fall
What six base units of the SI system are used in A Level Physics? - ANSWER
metre, kilogram, second, Ampere, Kelvin, Mole
What six base quantities of the SI system are used in A Level Physics? - ANSWER
length, mass, time, electric current, absolute temperature, amount of substance.
What is the value of the prefix T (tera) - ANSWER 10¹²
What is the value of the prefix G (giga) - ANSWER 10⁹
What is the value of the prefix M (mega) - ANSWER 10⁶
What is the value of the prefix k (kilo) - ANSWER 10³
What is the value of the prefix d (deci) - ANSWER 10⁻¹
What is the value of the prefix c (centi) - ANSWER 10⁻²
What is the value of the prefix m (milli) - ANSWER 10⁻³
What is the value of the prefix μ (micro) - ANSWER 10⁻⁶
What is the value of the prefix n (nano) - ANSWER 10⁻⁹
What is the value of the prefix p (pico) - ANSWER 10⁻¹²
What is the accuracy of measurements? - ANSWER How close a measurements
are to the true value.
What is the precision of measurements? - ANSWER How close to each other
repeated measurements are.
What is measurement error? - ANSWER The difference between the measured
value and the true value of the quantity.
What are random errors? - ANSWER Measurement errors that occur due to results
varying in an unpredictable way.
What is the main method for correcting for random errors? - ANSWER Taking
repeated measurements and finding the mean.
What are systematic errors? - ANSWER A measurement error that causes the
measurements to differ from the true value by a consistent amount for each
measurement.
,What is a zero error? - ANSWER A systematic error that arises from an instrument
reading reading a non-zero reading when nothing is being measured.
What is an absolute uncertainty? - ANSWER The interval around the measured
value within which the true value is expected to lie.
What is a percentage uncertainty? - ANSWER The absolute uncertainty stated as a
percentage of the measured value.
How do you combine uncertainties when measurements are added or subtracted? -
ANSWER Add together the absolute uncertainties.
How do you combine uncertainties when measurements are multiplied or divided? -
ANSWER Add together the percentage uncertainties.
What happens to the uncertainty in a measurement when it is raised to a power? -
ANSWER The percentage uncertainty is multiplied by the power.
What is a scalar quantity? - ANSWER A quantity with magnitude but no direction.
What is a vector quantity? - ANSWER A quantity with magnitude and direction.
When adding two perpendicular vectors what can you use to find the direction of the
resultant? - ANSWER Pythagoras' Theorem
When adding two perpendicular vectors what can you use to find the magnitude of
the resultant? - ANSWER Trigonometry
What is vector resolution? - ANSWER The process of splitting a vector into two
perpendicular components.
What is a resultant vector? - ANSWER The sum of two or more individual vectors.
How is the resultant found in a vector diagram when adding several vectors
together? - ANSWER Join the vectors nose to tail and the resultant is from the tail
of the first to the nose of the last vector.
What is displacement? - ANSWER The distance of an object from a point in a
specific direction (vector)
What is velocity? - ANSWER Rate of change of displacement (vector) ∆s/∆t if
constant
What is speed? - ANSWER Change in distance traveled per unit time (scalar)
What is acceleration? - ANSWER Rate of change of velocity (vector) ∆v/∆t if
constant
What are the units of acceleration? - ANSWER ms⁻²
, What is meant by constant velocity? - ANSWER Speed and direction of motion
don't change
What is represented by the gradient of a distance-time graph? - ANSWER Speed
What is represented by the gradient of a displacement-time graph? - ANSWER
Velocity
What is represented by the gradient of a velocity-time graph? - ANSWER
Acceleration
What is represented by the area under a velocity-time graph? - ANSWER Change
in displacement
What is represented by the area under an acceleration-time graph? - ANSWER
Change in velocity
When can the suvat equations by used? - ANSWER When there is constant
acceleration and motion along a straight line.
What is the effect of mass on the acceleration for an object in free-fall? - ANSWER
None
What is the relationship between displacement and time for an object falling freely
from rest? - ANSWER Displacement is proportional to time squared (sαt²)
What is a projectile - ANSWER An object acted upon only by the force of gravity
What shape is the path of a projectile? - ANSWER Parabolic
What is the initial vertical velocity of an object projected horizontally? - ANSWER
Zero
What angle of projection that results in maximum range - ANSWER 45°
Ignoring air resistance what is the acceleration of a projectile? - ANSWER Always g
downwards
How does horizontal velocity vary in projectile motion? - ANSWER It is constant
If a projectile returns to its starting height - ANSWER Initial and final velocities have
the same magnitude
What equation used for the horizontal component of projectile motion? - ANSWER
Displacement = Velocity x time (since horizontal velocity is constant)
What aspect links the vertical and horizontal motion of a projectile - ANSWER Time
taken to fall
