physics idk

Question 1

equation for total charge?

Answer 1

total charge = current x time

Question 2

what is current and when does it flow

Answer 2

a flow of electrical charge than only flows if there is a source of potential difference

Question 3

what is an ammeter

Answer 3

measures current. must always be placed in series with the component you are investigating

Question 4

what is a voltmeter

Answer 4

measures the potential difference. must be placed in parallel with the component you are investigating

Question 5

what happens when a component is removed in series

Answer 5

the circuit is broken

Question 6

for a series:
potential difference?
current?
resistance?

Answer 6

potential difference is shared
current is the same everywhere
resistance adds up

Question 7

for a parallel:
potential difference?
current?
resistor?

Answer 7

potential difference is the same everywhere
current is shared
adding a resistor reduces the total resistance

Question 8

what are vectors and scalars

Answer 8

vectors have magnitude and direction

scalars have magnitude and no direction

Question 9

what is weight

Answer 9

force acting on an object due to gravity

weight = mass x gravitational field strength

Question 10

elastic potential equation

Answer 10

Ee = 0.5 x ke(2)

Question 11

pressure in a solid?

Answer 11

pressure = force/area of surface

Question 12

difference between distance and displacement

Answer 12

distance is scalar, displacement is a vector

Question 13

difference between speed and velocity?

Answer 13

speed is scalar, velocity is a vector

Question 14

acceleration equation

Answer 14

acceleration = change in velocity / time

Question 15

what is terminal velocity

Answer 15

when an object falls through a fluid, it’s speed increases as the friction builds. eventually the frictional force is equal to the accelerating force

Question 16

newton’s 1st law?

Answer 16

a force is needed to change motion

Question 17

newton’s second law? (equation)

Answer 17

resultant force = mass x acceleration

Question 18

newtons 3rd law?

Answer 18

every action has an equal and opposite reaction

Question 19

transverse waves?

Answer 19

osciallate perpendicular to direction of energy transfer, includes all EM waves

Question 20

longitudinal waves?

Answer 20

oscillate parallel to direction of energy transfer. includes sound waves

Question 21

wave speed equation?

Answer 21

wave speed = frequency x wavelength

Question 22

rule for all reflected waves

Answer 22

angle of incidence = angle of reflection

Question 23

what is refraction

Answer 23

when a wave changes direction upon meeting a denser surface

Question 24

what is the EM spectrum

Answer 24

radio - micro - infrared - visible light - UV - x-rays - gamma rays

Question 25

use of radio waves

Answer 25

communications due to long wavelengths

Question 26

uses of micro waves

Answer 26

satellites and ovens as they pass easily through water

Question 27

uses of infrared

Answer 27

IR cameras detect it as it is given out by all living objects

Question 28

uses of visible light

Answer 28

fibre optic cables carry data over long distances using it, as light rays are reflected

Question 29

uses for ultraviolet

Answer 29

fluorescent lights emit uv radiation, which is re absorbed and emitted as visible light

Question 30

uses for x-rays and gamma rays

Answer 30

x-rays are used in medicine as they pass easily through flesh but not bone both can be used in high dosage to kill cancer cells