Physics paper 2

Question 1

what is the typical speed for a person walking, running and cycling?

Answer 1

1.5m/s-w
3m/s-r
6m/s-c

Question 2

describe motion in a circle

Answer 2

constant speed but changing velocity

Question 3

state newtons first law

Answer 3

that a resultant force is needed for something to start moving speed up or slow down

Question 4

what is inertia?

Answer 4

Tendency for motion to remain unchanged

Question 5

rearrange the resultant force equation to find inertial mass.

Answer 5

f=ma -> m=f/a

Question 6

what is the difference between velocity and distance time graphs

Answer 6

gradient of a DT graph is the speed.

gradient of a VT graph is the acceleration

Question 7

state newton’s third law

Answer 7

for every action there is an equal and opposite reaction but in a different reaction

Question 8

how are the oscillations in a transverse wave?

Answer 8

perpendicular to the direction of energy transfer

Question 9

how are oscillations in a longitudinal wave?

Answer 9

parallel to the direction of energy

Question 10

name all the properties of a wave

Answer 10

frequency
amplitude
wavelength
period

Question 11

why would a wave bend towards the normal line?

Answer 11

if it crosses a boundary at an angle and speeds up when it is refracted

Question 12

why would a wave bend away from the normal line

Answer 12

if it crosses a boundary at an angle and slows down

Question 13

what type of waves are EM waves?

Answer 13

transverse

Question 14

what are the 7 basic wave types? list their wave length as well

Answer 14

Radio-1m _ 10^4
micro-10^-2
infrared-10^-5
Vlight-10^-7
UV-10^-8
X-rays-10^-10
Gamma-10^-15

Question 15

why do EM waves have a range of frequencies?

Answer 15

generated by a variety of changes in atoms and their nuclei

Question 16

Name a use for each of the 7 basic wave types?

Answer 16

radio waves are used for communication.
microwaves are used by satellites and used to heat food
infrared is used for temp monitoring
visible light-transmit data through cables
uv- security pens to mark property or tanning
x-rays-used to picture broken bones
Gamma- used to treat cancer by killing the cells

Question 17

what is a danger of uv?

Answer 17

damage surface skin cells into sunburn, can cause it to age prematurely as well.
Serious effects are blindness or cancer

Question 18

how is radiation dose measured and what does it measure?

Answer 18

sieverts. It is a measure of the risk of harm of the body to radiation

Question 19

what is a solenoid?

Answer 19

a wire wrapped into a coil.

Question 20

What is an electromagnet? Give an example.

Answer 20

magnet who’s magnetic field can be turned on and off.

Solenoid.

Question 21

how does wrapping the wire into a coil have an increased effect

Answer 21

field lines around each loop of wire line up with each other.Lots of field lines pointing in the same direction which makes them close.The closer the field lines are the stronger.

Question 22

list the fingers used for flhr

Answer 22

thumb-motion
first finger-field
second finger-current

Question 23

what is the motor effect?

Answer 23

the force exerted when a wire carrying current is put in between magnetic poles.

Question 24

what happens to a wire when its in a magnetic field at certain angles?

Answer 24

90-full force
parallel-no force
in between-some force

Question 25

what happens when you reverse direction of current or magnetic field

Answer 25

direction of force will reverse

Question 26

work

Answer 26

the product of force and distance moved along the line of the action of the force

Question 27

what is inversely proportional

Answer 27

a relationship between two variables where one decreases and the other increases

Question 28

what is collision?

Answer 28

an event where two or more objects or particles come together with a resultant change of direction and energy.

Question 29

what is momentum like in a closed system

Answer 29

total momentum before the even equals the total momentum after the even.momentum is conserved.

Question 30

what does transmitted mean?

Answer 30

when waves are sent out from a source or pass through material

Question 31

what is a refractive index?

Answer 31

a measure of the extent to which light is refracted by a material

Question 32

definition of ionising

Answer 32

refers to radiation that causes atoms to lose or gain atoms becoming ions

Question 33

what is flux density?

Answer 33

a measure of the density of the field lines around a magnet

Question 34

what is a commutator?

Answer 34

device used to reverse direction of flow of an electric current in motors and generators