# As level physics help

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#1
Can any one tell me the answer to this question
Last edited by Elderfury843; 1 month ago
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1 month ago
#2
Those graphs are telling different stories about the motion of the ball and you've got to decide which is right (or most correct) based on what you know about objects in free fall.

You could translate the graphs in to English something like

D. the ball starts off with zero acceleration, after a short while the acceleration has increased and eventually rises to a maximum value.

And see if that helps.
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1 month ago
#3
(Original post by Elderfury843)
Can any one tell me the answer to this question
Have you got the 2020 paper?
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1 month ago
#4
(Original post by Joinedup)
Those graphs are telling different stories about the motion of the ball and you've got to decide which is right (or most correct) based on what you know about objects in free fall.

You could translate the graphs in to English something like

D. the ball starts off with zero acceleration, after a short while the acceleration has increased and eventually rises to a maximum value.

And see if that helps.
What's wrong with B?
surely the acceleration is always 9.81?
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1 month ago
#5
(Original post by Qxi.xli)
What's wrong with B?
surely the acceleration is always 9.81
Do you have this paper?
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1 month ago
#6
(Original post by Qxi.xli)
What's wrong with B?
surely the acceleration is always 9.81?
Question says that the ball of scrunched up paper reaches *terminal velocity* before it hits the ground...

That's the velocity where drag force from the air is equal to the weight force... once a falling object reaches terminal velocity it'll fall at the same speed all day (or until it hits the ground)

Terminal velocity applies to objects falling through fluids (liquids and gasses)... but not to objects falling through vacuum where no drag force occurs.

objects with a large mass relative to their surface area have a high terminal velocity, objects with a low mass relative to their surface area have a low terminal velocity... so in an atmosphere if you dropped a hammer and a feather at the same time the hammer would hit the ground first, but in a vacuum it's different...

2
1 month ago
#7
(Original post by Joinedup)
Question says that the ball of scrunched up paper reaches *terminal velocity* before it hits the ground...

That's the velocity where drag force from the air is equal to the weight force... once a falling object reaches terminal velocity it'll fall at the same speed all day (or until it hits the ground)

Terminal velocity applies to objects falling through fluids (liquids and gasses)... but not to objects falling through vacuum where no drag force occurs.

objects with a large mass relative to their surface area have a high terminal velocity, objects with a low mass relative to their surface area have a low terminal velocity... so in an atmosphere if you dropped a hammer and a feather at the same time the hammer would hit the ground first, but in a vacuum it's different...

ahh I see, so the answer is C?
and if the scrunched up paper was dropped in a vacuum, it would be B, right?
thanks so muchh!
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