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# IAL Edexcel Physics Unit 1 24th May 2016 watch

1. Lads I need help with those:

Tough Material:
Hard Material:
I need to know their definitions based on mark schemes.
1. Lads I need help with those:

Tough Material:
Hard Material:
I need to know their definitions based on mark schemes.
Tough:Can absorb a lot of energy before breaking
Hard:Material that is resistant to cutting,Indentation and abrasion(Scratching)
2. Welcome to the Edexcel Examinations...
May the odds be ever in your favour.😂
3. Can some one tell me this; Why does a ball with a large radius fall through a vicious drag faster than a ball with a small radius?
Then whats the difference between Strength and Ultimate Tensile Strength
there's none, but in exams use the word ultimate tensile strength since only strength is a vague term
5. (Original post by Sunethra)
Can some one tell me this; Why does a ball with a large radius fall through a vicious drag faster than a ball with a small radius?
fall through a viscous drag?? its a force resisting motion.
6. (Original post by Sunethra)
Can some one tell me this; Why does a ball with a large radius fall through a vicious drag faster than a ball with a small radius?
More time required to reach terminal velocity,As a result the final velocity of large radius is more than the small radius
7. (Original post by OnTheHorizon)
More time required to reach terminal velocity,As a result the final velocity of large radius is more than the small radius
Can we also say that drag is directly proportional to area r^2 and therefore the mass if directly proportional to its volume r^3 therefore the big heavier sphere falls faster?
And thank you for the answer
8. (Original post by OnTheHorizon)
More time required to reach terminal velocity,As a result the final velocity of large radius is more than the small radius
wat would happen if 2 balls one with a larger radius but both balls with same mass (therefore different densities) fall freely under gravity which ball would hve a higher terminal velocity
if u cn plz explain
9. (Original post by saitama kun)
wat would happen if 2 balls one with a larger radius but both balls with same mass (therefore different densities) fall freely under gravity which ball would hve a higher terminal velocity
if u cn plz explain
The larger radius would fall faster because more drag is needed to equal the weight as a result a large amount of drag is needed therefore the speed should also be large because we know that drag is directly proportional to the speed. therefore the ball falls faster.
10. Which flow is faster? turbulent or laminar and why?
11. (Original post by Sunethra)
The larger radius would fall faster because more drag is needed to equal the weight as a result a large amount of drag is needed therefore the speed should also be large because we know that drag is directly proportional to the speed. therefore the ball falls faster.
shuldnt da small ball fall at a greater vel as both balls have da same weight so as large ball will have larger drag force it would reach equilibrium faster dan the small ball so large ball has smaller terminal vel dan smaller balll
12. What you are saying happens only during free fall
13. da paper was fine ryt..
anyone gt da accel value fr da spider question as 7 ms-2
14. (Original post by saitama kun)
da paper was fine ryt..
anyone gt da accel value fr da spider question as 7 ms-2
yeah it was sth like 7.21 ms-2
what did you do for the horizontal velocity in the picture question?
and in the last question for finding viscosity from graphical method?
15. i cant recall da nswer horiz distance is 0.3 m i think n time is 0.6 sec
16. last question plot v against r2 n find gradient n substitute values to find viscosity
17. (Original post by saitama kun)
i cant recall da nswer horiz distance is 0.3 m i think n time is 0.6 sec
I got the same but don't remember the velocity
18. (Original post by saitama kun)
last question plot v against r2 n find gradient n substitute values to find viscosity
I said v against r2 and find the gradient gives the viscosity.
19. For the spider ques i did (weight of d spider + fly) - tension = (combined mass of spider + fly) * acceleration ...made accn. The subject and solved..don't remember the ans though.

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