science tricky questions Flashcards
why does a rolling ball eventually come to a stop
all the ke in the ball is converted to heat and sound eergy
experiment :
used two different weights on a balance.
question : why did samy coduct this experiment in an environment( x environtment) without wind?
key word : balamce .
how would experiment be inaccurate ==> how measurement of balance would be affected
ans : the balance would tilt unevently
why thicker cup containing hot water = hands feel hot slower?
thicker cup = heat flow slower so counduct heat from hot water to hands slower
a farmer removed food carryinng tubes of a tree . why was the top of the cut swollen
the food made by the leaves could not be transported down (x away )the cut so the food accumilated at the top .
aim : to find out if light is required for germination of seeds.
setup ==
changed var==> type of seeds
==> moisture of cotton wool in each setup
Is this experiment fair??
no, she should use the same type of beans as the only variable she should change is the presence / absence of line
what is your hypothesis ? 3 wet towels . towel a is folded 0 times , b folded 2 time and c folded 3 time
ans : (give relationship)
the greater the surface area of the towel exposed to its surrounding, the faster the rate of evaporation.
butter burning point == 170 c
set up 1. = pan on pot of water on heating thing
set up 2. pan directly on heating thing
will set up 1 . butter burn?
NO. THE BOILING POINT OF WATER IS lower THAN THE TEMPERATURE AT HICH BUTTER BURNS.
why will adding a battery to an electric circuit increase brigtness of bulbs?
more battery = more electric current flowing through circuit
setup :
balance beam . spring on right and a ball on left side .
how to make ball fly higher by changing spring
use more elastic spring
why does a bulb turn on when a circuit is closed ?
electric current flows through bulb
what will be one observable change when a flower becomes fruits
the petals will wilt/drop
the anthers drop
the ovary develops into the fruit
table = 10 cm. bubbles produced=20
8cm bubbles produced=24
6cm bubbles produced=26
4cm =26
2cm=26
1cm = ? WHY?
when the distance between the light source and the plant was 6cm, the bubbles produced already reached a maximum rate of photosynthesis to produce a maximum rate of photosynthesis of 26 bubles of gas .
when a circuit is open , ——————
no electricity flows through
will a heavier ball travelling at the same speed cause another ball to roll faster when it is hit?
yes.the heavier ball will possess more ke ( more ke required to push because it has more gpe) which is converted to more ke of the other balls , causing them to roll faster
