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OCR A A-Level Physics - Modelling
OCR A A-Level Physics - Modelling
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OCR A A-Level Physics - ModellingSI unit of length - correct answer-Metre (m)
SI unit of mass - correct answer-Kilogram (kg)
SI unit of time - correct answer-Second (s)
SI unit of electric current - correct answer-Ampere (A)
SI unit of temperature - correct answer-Kelvin (K)
SI unit of amount of substance - correct answer-Mole (mol)
What's peta's prefix symbol and factor? - correct answer-P (x10^15)
What's tera's prefix symbol and factor? - correct answer-T (x10^12)
What's giga's prefix symbol and factor? - correct answer-G (x10^9)
What's mega's prefix symbol and factor? - correct answer-M (x10^6)
What's kilo's prefix symbol and factor? - correct answer-k (x10^3)
What's deci's prefix symbol and factor? - correct answer-d (x10^-1)
What's centi's prefix symbol and factor? - correct answer-c (x10^-2)
What's milli's prefix symbol and factor? - correct answer-m (x10^-3)
What's micro's prefix symbol and factor? - correct answer-µ (x10^-6)
What's nano's prefix symbol and factor? - correct answer-n (x10^-9)
What's pico's prefix symbol and factor? - correct answer-p (x10^-12)
What's femto's prefix symbol and factor? - correct answer-f (x10^-15)
Define scalar quantity - correct answer-A quantity with magnitude but no direction
Define vector quantity - correct answer-A quantity with both magnitude and direction
What is the gradient equal to on a distance-time graph? - correct answer-Speed
How do you find out instantaneous speed? - correct answer-Draw a tangent at the time
needed
, What's the gradient equal to in a displacement-time graph? - correct answer-Velocity
How can instantaneous velocity be calculated? - correct answer-Draw a tangent at the time
needed
What's the gradient of a velocity-time graph equal to? - correct answer-Acceleration
What's the area under a velocity-time graph equal to? - correct answer-Displacement
Define thinking distance - correct answer-It's the distance travelled between the moment
when you first see a reason to stop to the moment when you apply the brake
What's the equation for reaction time? - correct answer-Reaction time = Thinking distance /
speed
Why does the value of g vary? - correct answer-Due to different altitude, latitude and
geology of the area
What 3 types of experimental equipment can be used to determine g? - correct answer-1).
Electromagnet and trap door
2). Light gates
3). Taking pictures or video
How do you determine g using a graph? - correct answer-Plot a graph of
displacement-time^2
Using the equation s=1/2 x a x t^2, acceleration can be determined.
Gradient is equal to a/2
Define Hooke's Law - correct answer-The force applied is directly proportional to the
extension of the spring unless the limit of proportionality is exceeded
Why does the horizontal velocity of the projectile remain constant? - correct answer-As the
force is acting perpendicular to the horizontal velocity. Cos(90) = 0
How do you find net force? - correct answer-Net force = Mass x Acceleration
Define Newton - correct answer-When 1kg of mass has an acceleration of 1m/s^2 in the
direction of the force
What is the astronomical unit (AU)? - correct answer-It is the average distance from the
Earth to the Sun (1.5 x 10^11 m)
What is the light-year (ly)? - correct answer-It is the distance travelled by light in a vacuum in
a time of one year (9.46 x10^15 m)
Define the parsec (pc) - correct answer-The distance at which a radius of one AU subtends
an angle of one arcsecond (3.1 x10^16 m)
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