How the hell does the make sennnnnnnnseeeeeeeeeeeeee

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wantodothebest
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#1
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OK SO I AM LOSING MY *** FROM THIS PHYSICS QUESTION.

It says:

Describe the consequences on the ball when kicked at a higher speed BUT THE IMPULSE REMAINS THE SAME.

Hence, I said:

Inital momentum is greater
Change in momentum is the same
So higher final speed


BUT IT GIVES MY TWO REASONS AND SAYS LOWER FINAL SPEED??????????


I AM GOING TO FAIL I NEED AN A* IN PHYSICS WTF
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Radioactivedecay
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Can you post the entire question with its previous parts?
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wantodothebest
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(Original post by Radioactivedecay)
Can you post the entire question with its previous parts?
It's quite long but I got the right answers to the other parts:

A football of mass 0.42 kg is moving horizontally at 10 m s–1 towards a footballer’s boot, which then kicks it. Figure 1 shows how the force between the boot and the ball varies with time while they are in contact:

(The impulse shown by the area under the graph is 11Ns)
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Radioactivedecay
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(Original post by wantodothebest)
OK SO I AM LOSING MY *** FROM THIS PHYSICS QUESTION.

It says:

Describe the consequences on the ball when kicked at a higher speed BUT THE IMPULSE REMAINS THE SAME.

Hence, I said:

Inital momentum is greater
Change in momentum is the same
So higher final speed


BUT IT GIVES MY TWO REASONS AND SAYS LOWER FINAL SPEED??????????


I AM GOING TO FAIL I NEED AN A* IN PHYSICS WTF
This answer does make sense to me. You answered the question if the foot had approached the ball faster, when it's the ball that's approaching the foot faster. If the ball is approaching with a higher speed it would have a greater momentum in an opposite direction to the foot, hence, a larger change in momentum(impulse) is needed to give it the same speed in the previous question. However, since the impulse is the same, the final speed would have to be lower.
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Sinnoh
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Is it being kicked in the opposite direction?
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wantodothebest
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(Original post by Radioactivedecay)
This answer does make sense to me. You answered the question if the foot had approached the ball faster, when it's the ball that's approaching the foot faster. If the ball is approaching with a higher speed it would have a greater momentum in an opposite direction to the foot, hence, a larger change in momentum(impulse) is needed to give it the same speed in the previous question. However, since the impulse is the same, the final speed would have to be lower.
Oh.. I was having a break down for nothing haha THANK YOU!!!

Question - I have done every single AQA Unit 1 - 5 past paper on physics and maths tutor and my exam is next week and yet it took me a while to get this question...

What shall I do to recitify this? I found the question hard to understand at first?

Many thanks
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wantodothebest
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(Original post by Sinnoh)
Is it being kicked in the opposite direction?
Yes
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wantodothebest
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(Original post by Radioactivedecay)
This answer does make sense to me. You answered the question if the foot had approached the ball faster, when it's the ball that's approaching the foot faster. If the ball is approaching with a higher speed it would have a greater momentum in an opposite direction to the foot, hence, a larger change in momentum(impulse) is needed to give it the same speed in the previous question. However, since the impulse is the same, the final speed would have to be lower.
Wait lol I still dont get it...


If it has a greater inital momentum, why wont it need a greater final momentum to give the same change in momentum...
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purplepeacock
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(Original post by wantodothebest)
Wait lol I still dont get it...


.
Lmao ffs. Why is this me
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wantodothebest
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Bump.

I want to get into my firm pls help
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Radioactivedecay
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(Original post by wantodothebest)
Wait lol I still dont get it...


If it has a greater inital momentum, why wont it need a greater final momentum to give the same change in momentum...
The system has a smaller initial momentum because the ball is travelling in opposite direction to the foot.
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wantodothebest
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(Original post by Radioactivedecay)
The system has a smaller initial momentum because the ball is travelling in opposite direction to the foot.
Mark scheme says greater inital momentum :O

Edit: Oh the system is the boot and the foot
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wantodothebest
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Guys I am so stumped. Any resources I can look at ?
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