Unit 1 - Physics On The Go

Question 1

What is the formula for strain?

Answer 1

Strain = x/L
Strain = extension/original length

Question 2

What is the formula for stress?

Answer 2

Stress = force / area

σ = F/A

Question 3

Why is the formula for the Young’s modulus?

Answer 3

Stress/strain

Question 4

On a load extension graph, what represents the strain energy?

Answer 4

The area under the graph represents strain energy

Question 5

What is an electron volt?

Answer 5

When an electron is accelerated through a potential difference of 1v, it’s change in kinetic energy is 1eV

Question 6

What is the unit of energy?

Answer 6

A Joule

Question 7

What is the unit of power?

Answer 7

A Watt, representing 1 joule per second

Question 8

What is power?

Answer 8

Work done over time, measures in watts, 1 watt is 1 joule per second

Question 9

What are the SI base units?

Answer 9

Mass: kilogram: kg
Time: second: s
Length: metre: m
Electrical current: ampere: A
Temperature: kelvin: K
Amount of substance: mole: mol
Luminous intensity: candela: cd

Question 10

What is force in base units?

Answer 10

Newtons = kilogram x metre x second^-2

N = kgms^-2

Question 11

What is the gradient on a displacement time graph?

Answer 11

Displacement / time = velocity

Question 12

What is energy in base units?

Answer 12

Joule = kilogram x metre^2 x second^-2

J = kgm^2s^-2

Question 13

What is power in base units?

Answer 13

Watt = kilogram x metre^2 x second^-3

W = kgm^2s^-3

Question 14

What is frequency in base units?

Answer 14

Hertz = second^-1

Hz = s^-1

Question 15

What is charge in base units?

Answer 15

Coulomb = amp x second

C = As

Question 16

What is voltage in base units?

Answer 16

Volt = kilogram x meter^2 x second^-3 x amp^-1

V=kgm^2s^-3A^-1

Question 17

What is resistance in base units?

Answer 17

Ohm = kilogram x meter^2 x second^-3 x amp^-2

Ω = kgm^2s^-3A^-2

Question 18

What is the formula for strain?

Answer 18

Strain = change in length / length

ε = Δl/l

Question 19

What factor is a deca-?

Answer 19

10^1

Question 20

What factor is a hecto-?

Answer 20

10^2

Question 21

What factor is a kilo-?

Answer 21

10^3

Question 22

What factor is a mega-?

Answer 22

10^6

Question 23

What factor is a giga-?

Answer 23

10^9

Question 24

What factor is a tera-?

Answer 24

10^12

Question 25

What factor is a peta-?

Answer 25

10^15

Question 26

What factor is a deci-?

Answer 26

10^-1

Question 27

What factor is a centi-?

Answer 27

10^-2

Question 28

What factor is a micro-?

Answer 28

10^-6

Question 29

What is the vector of speed?

Answer 29

Velocity

Question 30

What is the vector of distance?

Answer 30

Displacement

Question 31

What is the scalar of velocity?

Answer 31

Speed

Question 32

What is the scalar of displacement?

Answer 32

Distance

Question 33

What is the gradient of a velocity-time graph?

Answer 33

Velocity / time = acceleration

Question 34

What is the area under a velocity-time graph?

Answer 34

Velocity x time = distance travelled

Question 35

What is the gradient of a distance-time graph?

Answer 35

Distance / time = speed

Question 36

What factor is nano-?

Answer 36

10^-9

Question 37

What factor is pico-?

Answer 37

10^-12

Question 38

What factor is femto-?

Answer 38

10^-15

Question 39

What is the formula for velocity?

Answer 39

Velocity = displacement / time

Question 40

What is formula for speed?

Answer 40

Speed = distance / time

Question 41

What is a scalar quantity?

Answer 41

A quantity that has a magnitude only

Question 42

What is a vector quantity?

Answer 42

A quantity that has magnitude and direction

Question 43

What is the formula for average speed?

Answer 43

Average speed = total distance / total time

Question 44

What is instantaneous speed?

Answer 44

The speed at any particular instant, can be found from the gradient of a tangent on a distance-time graph

Question 45

What is the formula for acceleration?

Answer 45

Acceleration = change in velocity / time to change a = Δv/Δt Acceleration = (final velocity - initial velocity) / time a=(v-u)/t

Question 46

What is the gradient on a velocity-time graph?

Answer 46

Change in velocity / change in time = acceleration (delta)v/(delta)t = a

Question 47

What is the area under a velocity-time graph?

Answer 47

Velocity x time = distance

Question 48

What is Newton's first law of motion?

Answer 48

An object will remain in equilibrium unless acted upon by a resultant force

Question 49

What is Newton's second law of motion?

Answer 49

If a resultant force acts on an object, it is proportional the the acceleration if the mass remains constant Force = mass x acceleration F=ma

Question 50

What is Newton's third law?

Answer 50

Every action has an equal and opposite reaction ``` Forces: Are equal Act in opposite direction Are the same type of force Act on different bodies ```

Question 51

Which SUVAT doesn't contain s?

Answer 51

v=u+at Final velocity = initial velocity + acceleration x time

Question 52

Which SUVAT doesn't contain a?

Answer 52

s=((u+v)/2) x t Displacement = ((initial velocity + final velocity)/2) x time

Question 53

What does SUVAT stand for?

Answer 53

``` S= displacement (metres) U= initial velocity (metres per second) V= final velocity (metres per second) A= acceleration (metres per second per second) T= time (seconds) ```

Question 54

Which SUVAT doesn't use v?

Answer 54

s=ut+(1/2)at^2 Displacement = initial velocity x time + 1/2 acceleration x time^2

Question 55

Which SUVAT doesn't use t?

Answer 55

v^2 = u^2 +2as Final velocity^2 = initial velocity^2 + 2 x acceleration x time

Question 56

What is the formula for density?

Answer 56

p=m/V | Density = mass/volume

Question 57

What properties must a stationary interference pattern have?

Answer 57

Both waves must have the same frequency and as such a constant phase difference

Question 58

What is uniform motion?

Answer 58

Motion without acceleration

Question 59

What is the formula for kinetic energy?

Answer 59

E(k)=1/2mv^2 Kinetic energy = 1/2 x mass x velocity^2