AS Physics 2020

Question 1

Define accuracy

Answer 1

How close a measurement is to the true value

Question 2

Define precision

Answer 2

How close measurements are to each other.

How many significant figures it is measured to.

Question 3

How to calculate uncertainty when adding or subtracting measurements?

Answer 3

Add the uncertainties of each value.

Question 4

How to calculate uncertainty when multiplying or dividing measurements?

Answer 4

Add fractional uncertainties of values and multiply the sum of these uncertainties by the result.

Question 5

How to calculate percentage uncertainty?

Answer 5

(uncertainty÷measured value)x100

Question 6

How to calculate relative uncertainty?

Answer 6

uncertainty÷measured value

Question 7

Give 4 examples of vector quantities

Answer 7

Velocity
Acceleration
Weight
Displacement

Question 8

Give 4 examples of scalar quantities

Answer 8

Density
Speed
Distance
Volume

Question 9

The gradient of a displacement-time graph gives the _________

Answer 9

velocity

Question 10

The gradient of a velocity-time graph gives the _________

Answer 10

acceleration

Question 11

The area under a velocity-time graph gives the _________

Answer 11

displacement

Question 12

The gradient of a acceleration-time graph gives the _________

Answer 12

change in velocity

Question 13

List the 4 suvat equations

Answer 13

v=u+at
s=(u+v)/2 x t
s=ut+½at²
v²=u²+2as

Question 14

At terminal velocity, weight is equal to ______

Answer 14

air resistance.

Question 15

Momentum formula

Answer 15

Momentum=massxvelocity

Question 16

Conservation of linear momentum formula

Answer 16

m₁v₁ + m₂v₂ = m₁v₁ + m₂v₂

Question 17

Elastic collision rule

Answer 17

Total Kinetic energy before collision = total kinetic energy after collision.

Question 18

Inelastic collision rule

Answer 18

Total kinetic energy before collision > total kinetic energy after collision.

Question 19

Newton’s 1st law

Answer 19

Object will remain stationary or in constant motion unless acted upon by another force.

Question 20

Newton’s 2nd law

Answer 20

F=ma i.e net force applied is proportional to acceleration

Question 21

Newton’s 3rd law

Answer 21

Every action has an equal and opposite reaction

Question 22

Impulse formula

Answer 22

Δp = FΔt = mv - mu

Question 23

Upthrust in fluid formula

Answer 23

upthrust = hρgA = ρgV

Question 24

Torque or moment of force formula

Answer 24

τ = Fdsinθ

Question 25

Conditions for equilibrium

Answer 25

``` Στ = 0 ΣF = 0 ```

Question 26

Work done by a force formula

Answer 26

ΔW = Fs x cosθ

Question 27

Work done in stretching a spring formula

Answer 27

ΔW = ½kx²

Question 28

Electrical potential energy formula

Answer 28

V = W/q

Question 29

Power in terms of work done formula

Answer 29

P = W/t = Fv

Question 30

Electric field intensity formula

Answer 30

E = V/d

Question 31

Current in terms of charge formula

Answer 31

I = Q/t

Question 32

Ohm's law formula

Answer 32

R = V/I

Question 33

Voltage in terms of charge formula

Answer 33

V = Energy/Q

Question 34

e.m.f formula

Answer 34

e.m.f = lost volts + terminal p.d.

Question 35

Resistivity formula

Answer 35

R = ρL/A

Question 36

Power definition

Answer 36

P = Energy/time

Question 37

When temperature of thermistor increases, resistance ________

Answer 37

decreases

Question 38

When Light around a LDR increases, resistance

Answer 38

decreases

Question 39

What are kirchoff's laws

Answer 39

``` ΣI = 0 ΣEMF = ΣIR ```

Question 40

Stress formula

Answer 40

σ = F/A

Question 41

Strain formula

Answer 41

ε = x/L

Question 42

Young modulus formula

Answer 42

E = σ/ε

Question 43

What is a wavelength

Answer 43

Distance between 2 crests or 2 toughs

Question 44

What is frequency of wave

Answer 44

Number of waves in 1 second

Question 45

What is time period of a wave

Answer 45

Time taken for 1 complete wave osscilation

Question 46

What is the speed of a wave

Answer 46

The distance moved by the wave in 1 second

Question 47

What is the amplitude of a wave

Answer 47

The maximum displacement of particles in a wave

Question 48

What are coherent waves

Answer 48

Two waves with the same frequency and constant phase difference

Question 49

Intensity of a wave formula

Answer 49

I∝a² (I is intensity, a is amplitude)

Question 50

What is constructive interference of waves

Answer 50

When the crests and troughs of 2 different waves overlap each other, amplitudes become added.

Question 51

What is destructive interference

Answer 51

When the crests of 1 wave overlap the troughs of another, the amplitudes cancel each other.

Question 52

What is the formula from the double slit experiment

Answer 52

x = (nλD)/d x is distance of nth fringe from centre n is the order of fringe counting from centre d is the distance between slits D is the distance between screen and slits

Question 53

What is the formula for diffraction gratings

Answer 53

nλ=dsinθ

Question 54

What is the strong force

Answer 54

Acts between nucleons and holds them together. Has a very short range.

Question 55

Those affected by the strong force are called ____

Answer 55

hadrons

Question 56

Those not affected by the strong force are called _____

Answer 56

leptons

Question 57

What is a fundamental particle

Answer 57

A particle that cannot be split into anything smaller e.g. electron

Question 58

What is the charge and strangeness of an Up quark

Answer 58

Charge: +⅔ Strangeness: 0

Question 59

What is the charge and strangeness of an Down quark

Answer 59

Charge: -⅓ Strangeness: 0

Question 60

What is the charge and strangeness of an Strange quark

Answer 60

Charge: -⅓ Strangeness: -1

Question 61

What are the 4 leptons

Answer 61

Electron Positron Electron neutrino Electron antineutrino

Question 62

What are 2 hadrons

Answer 62

Protons | Neutrons

Question 63

Define mass of a body

Answer 63

property of the body resisting changes in motion

Question 64

Define force

Answer 64

rate of change of momentum