questions exam Flashcards
3 factors causes total stopping distance car to be greaer
- driver reaction time slower due to tiredness
-poor weather condition due to rain
-poor weather due to icy
How does feeling sleepy likely to affect drivers reaction time
it increases it
why driver drink alchol is likely to increase chance of being in accident
bceause the driver reaction time increases
(or cuase slower reaction time).
why does the spring get longer when the electromagnet is switched on
electromagnet exert a downward force on the iron bar
why did student use transparent block and not opqaue object
light will pass through an transparent block
simlarities of convex and concave lens
both are deminished
method use to compare the infrared radition emitted from the vertical surface cube
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
Method use to investiagte how speed of a wave on a strched spring depend on tension in string
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.
Driver see haqzard on road and use brakes to stop. Expalain the factor that affect the distance needed to stop a vehilce in emergencey
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.
Give 1 simialrties and difference between orbit of earth moon and international space station
similar- both have cirucular orbit
differ- both have different orbital period
sun emits visble light, student concludes that visbile light is not abosrbed by the ozone layer. Tell one piece of evidence that show correct
our human eyes detect visble light so it must come through the ozone.
why does atmospheric pressure decrease as the student climbs higher
density of the air decrease and the mass of air above student decrease.
battery electric car need recharge. suggest 2 factor that affect the distance an electric car can travel before need rechargeing
capacity of battery and speed
describe method the student could have used to obtain result on raya box to shine a ray of light through air into glass block
- place a glass block on peice of paper
- draw around the glas block
- usea ray box to shine a ray of light through glass box
4.mark where ray of light enters and emerges from glass box. - remove glass box
- join the points to show the pattern
- draw a normal line at 90degree to surface
- use protractor to measure angle of incidence and reflection
- repet method by shining the ray box at different angle of incidence
slide is plastic, why does child become electrically charge when he goes down the slide
friction between child clothign and slide cause elctron transfer as 2 insulators are rubbed together.
