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Physics A-level > Retrieval Questions > Flashcards

Retrieval Questions Flashcards

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1
Q

When is a measurement valid

A

When it measures what it is supposed to be measuring

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2
Q

When is a result accurate

A

When it is close to the true value

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3
Q

What are precise results

A

When repeat measurements are consistent with each other

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4
Q

What is repeatability

A

How precise repeated measurements are when they are taken by the same person using the same equipment under the same conditions

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5
Q

What is reproducibility

A

How precise repeated measurements are when they are taken by different people using different equipment

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6
Q

What is the uncertainty of a measurement

A

The interval within which the true value is expected to lie

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7
Q

Define measurement error

A

The difference between a measured value and the true value

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8
Q

What type of error is caused by results varying around the true value in an unpredictable way

A

Random error

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9
Q

What is a systematic error?

A

a consistent difference between the measured values and true values

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10
Q

What does zero error mean?

A

a measuring instrument gives a false reading when the true value should be zero

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11
Q

Which variable is changed or selected by the investigator?

A

independent variable

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12
Q

What is a dependent variable

A

A variable that is measured every time the independent variable is changed

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13
Q

Define a fair test

A

a test in which only the independent variable is allowed to affect the
dependent variable

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14
Q

What are control variables?

A

variables that should be kept constant to avoid them affecting the dependent variable

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15
Q

What is a physical quantity?

A

a property of an object or of a phenomenon that can be measured

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16
Q

What are the S.l. units of mass, length, and time?

A

kilogram (kg), metre (m), second (s)

17
Q

What base quantities do the S.l. units A. K, and mol represent?

A

current, temperature, amount of substance

18
Q

List the prefixes, their symbols and their multiplication factors from pico to tera (in order of increasing magnitude)

A

Write it out

19
Q

What is a scalar quantity?

A

a quantity that has magnitude (size) but no direction

20
Q

What is a vector quantity?

A

a quantity that has magnitude (size) and direction

21
Q

What are the equations to resolve a force, F, into two perpendicular components, Fx and Fy?

A

Fx =Fcos0
Fy = F sin0

22
Q

What is the difference between distance and displacement?

A

distance is a scalar quantity
displacement is a vector quantity

23
Q

What does the Greek capital letter 🔺 (delta) mean?

A

Change in

24
Q

What is the equation for average speed in algebraic form?

A

V =🔺x /🔺t ( change in x over change in t)

25
Q

What is instantaneous speed?

A

the speed of an object over a very short period of time

26
Q

How can you calculate acceleration from a velocity-time graph?

A

acceleration is the gradient
displacement is the area under the graph

27
Q

Write the equation for acceleration in algebraic form.

A

a = 🔺v/🔺t

28
Q

What do the letters suvat stand for in the equations
of motion?

A

s = displacement
u = initial velocity
v = final velocity
a = acceleration
t=time taken

29
Q

Write the four suvat equations.

A

s = ut + 1/2at^2
s = 1/2(u+v)t
v = u+at
v^2 = u^2 +2as

30
Q

Define stopping distance

A

the total distance travelled from when the driver first sees a reason to
stop, to when the vehicle stops

31
Q

Define thinking distance

A

the distance travelled between the moment when you first see a reason to stop to the moment when you use the brake

32
Q

Define braking distance

A

the distance travelled from the time the brake is applied until the vehicle
stops

33
Q

What does free fall mean?

A

when an object is accelerating under gravity with no other force acting on it

Physics A-level (10 decks)

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