questions exam

Question 1

3 factors causes total stopping distance car to be greaer

Answer 1

• driver reaction time slower due to tiredness
  -poor weather condition due to rain
  -poor weather due to icy

Question 2

How does feeling sleepy likely to affect drivers reaction time

Answer 2

it increases it

Question 3

why driver drink alchol is likely to increase chance of being in accident

Answer 3

bceause the driver reaction time increases
(or cuase slower reaction time).

Question 4

why does the spring get longer when the electromagnet is switched on

Answer 4

electromagnet exert a downward force on the iron bar

Question 5

why did student use transparent block and not opqaue object

Answer 5

light will pass through an transparent block

Question 6

simlarities of convex and concave lens

Answer 6

both are deminished

Question 7

method use to compare the infrared radition emitted from the vertical surface cube

Answer 7

Pour hot water into the hollow metal cube, then point the infrared detector of each side and take reading. During this, keep the detector the same distance from each surface

Question 8

Method use to investiagte how speed of a wave on a strched spring depend on tension in string

Answer 8

First add water from the string and adjust the frequenecy using the signal generator. Also, make the wooden bridge. Then, observe a steady pattern and measure the wavelength. Lastly calcultae wave spped from frequency of wavelemgthh.

Question 9

Driver see haqzard on road and use brakes to stop. Expalain the factor that affect the distance needed to stop a vehilce in emergencey

Answer 9

By condition on road surface as wet/icy road, and conditon of tyres of worns tyres and brales. These cause affect on friction by reduce between tyre and road, and increase braking this causes kinetic energy increase speed.

Question 10

Give 1 simialrties and difference between orbit of earth moon and international space station

Answer 10

similar- both have cirucular orbit
differ- both have different orbital period

Question 11

sun emits visble light, student concludes that visbile light is not abosrbed by the ozone layer. Tell one piece of evidence that show correct

Answer 11

our human eyes detect visble light so it must come through the ozone.

Question 12

why does atmospheric pressure decrease as the student climbs higher

Answer 12

density of the air decrease and the mass of air above student decrease.

Question 13

battery electric car need recharge. suggest 2 factor that affect the distance an electric car can travel before need rechargeing

Answer 13

capacity of battery and speed

Question 14

describe method the student could have used to obtain result on raya box to shine a ray of light through air into glass block

Answer 14

1. place a glass block on peice of paper
2. draw around the glas block
3. usea ray box to shine a ray of light through glass box
   4.mark where ray of light enters and emerges from glass box.
4. remove glass box
5. join the points to show the pattern
6. draw a normal line at 90degree to surface
7. use protractor to measure angle of incidence and reflection
8. repet method by shining the ray box at different angle of incidence

Question 15

slide is plastic, why does child become electrically charge when he goes down the slide

Answer 15

friction between child clothign and slide cause elctron transfer as 2 insulators are rubbed together.

Question 16

state one factor that affetcs the braking distance of the car

Answer 16

weather conditon - wet/icy road

Question 17

why and how does the kinetic energy of skier change as accerlate down the slide

Answer 17

increase gravitional potential energy to transofrmed to kinetic energy

Question 18

what is kN worth
3kN=

Answer 18

3000

Question 19

Student remove each piece of modelling clay from oil before dropping the next piece WHY

Answer 19

so that they dont build up at the bottom and all the peices fall the same distance

Question 20

Describe how to use compass to plot the magnetic field pattern around bar magent

Answer 20

1. Place bar magnet and compass on a peice of paper
2. Mark where compass points to
3. Keeping magnet in same place, move compass to marked point
   4.Repet these steps until go back to magnet
4. Join up all the points
5. add arrow in direction from north to south pole
6. repet steps for above and below the bar magnet

Question 21

how is velocity different to spped of aircraft when it travles constant velocity

Answer 21

velocity also includes direction

Question 22

air is taken into the front of the engine and pushed out of the engine, explain the effect this has on egnine

Answer 22

a equal force from the air pushes on the engine in the opposite direction

Question 23

describe lifecycle of star much more massive than the sun

Answer 23

1. stars initially form from a cloud of dust and gas called nebula
   2.the force of gravity pulls the dust and gas together to form a protostar
2. this provides enough thermal energy for the fusion og hydrogen nuclei to form helium nucli
3. when outward pressure of nuclear fusion equals to the gravity pulling eveything inwards it is called main sequence star
4. when hydrogen starts to run out, helium nuclei begin to fuse to form heavier elements up to iron and the star expand to form red super giant
5. the star will eventually collapse and explode in a supernova
6. this creates elememnts heavier than iron and distrivute them throughout universe
7. this leaves bheind a neutron star or a black hole

Question 24

method of force applied to spring and extension

Answer 24

1. set up equipmnet as shown
2. measure length of spring before place 1N weight on it
3. Add 1N weight
4. Now use metre ruler to measure the new length of spring
5. Calculate extension of spring
6. Add more weights to the spring increasing of 1N
7. Each time record extension of spring until 5N.

Question 25

ramp differ angle short and long ramp. Explain one advatge of use long ramp compare to small ramp

Answer 25

long ramp is at smaller angle so less force is needed to get up the ramp.

Question 26

student tested three people, mean distance was 12.8 Why if all people who took the test may not be 12.8 mean distance

Answer 26

Three students tested are not typical

Question 27

compare the model of solar system used now with the old model of solar system

Answer 27

similarities -
-Both model they orbit the moon, and planet in circular.
-The moon orbits the earth and there is only one sun.
Differences -
- in current model, planets orbit the sun whereas old planet orbit earth.
-There is shown of dwarf planet, whereas old model no dwarf planet.
-And 2 more planets.

Question 28

wavelentgh of transverse wave -

Answer 28

wavelength = Q

Question 29

amplitude of transverse wave -

Answer 29

amplitude = R divide 2

Question 30

why is it important that new scientific observations are peer reviewed?

Answer 30

to check the observations are correct

Question 31

give 2 ways that imaged formed by convex lens(larger, point up), is similar to image concave lens

Answer 31

upright
virtual

Question 32

in tranverse wave, the direction of oscilloscope is …..

Answer 32

perpendicular to direction of energy transfer by wave

Question 33

describe method to test, the black-coloured flask will emit more infrared radiation than the silver-coloured flask during 10mins of cooling. EQUIP - SILVER FLASK, BLACK FLASK, KETTLE COLD WATER

Answer 33

1. heat wtaer in kettle
2. add an equal volume of hot water to each flask
3. insert a thermoter to each flasj
4. record the inital reading from tempt of thereometer
5. start stopclock
6. record tempt after 10mins from both flask
7. calculate change in tempt + compare the results to test hypothesis

Question 34

when will flask emit infrared radition at the greatest rate and why - 1st/5th/9th min

Answer 34

1st cis there is greatest tempt difference between hot water and surrouding