# Isaac PhysicsWatch

#1
A spring with natural length 0.70m requires 3.2N to stretch it by 17.5cm. Work out the force required to stretch the spring to a length of 83cm.

How do i do this question

i got like 5.1 N but its wrong
0
1 month ago
#2
(Original post by Kimberley_P)
A spring with natural length 0.70m requires 3.2N to stretch it by 17.5cm. Work out the force required to stretch the spring to a length of 83cm.

How do i do this question

i got like 5.1 N but its wrong
f=kx

thats it.
0
1 month ago
#3
0
#4
(Original post by amal29)
it says its wrong
0
#5
(Original post by josejobs)
f=kx

thats it.
Thank you
0
1 month ago
#6
(Original post by Kimberley_P)
A spring with natural length 0.70m requires 3.2N to stretch it by 17.5cm. Work out the force required to stretch the spring to a length of 83cm.

How do i do this question

i got like 5.1 N but its wrong
Quick common sense check: how can it require a greater force to stretch it by a lesser distance? (13 cm < 17.5 cm) You should see at once that the answer has to be less than 3.2 N.
0
4 weeks ago
#7
(Original post by Kimberley_P)
A spring with natural length 0.70m requires 3.2N to stretch it by 17.5cm. Work out the force required to stretch the spring to a length of 83cm.

How do i do this question

i got like 5.1 N but its wrong
It would be better that you write your working than just the answer to demonstrate what you know.

What is the spring constant?

What is the extension of the spring when the length is 83 cm?

Apply F = kx, where x is the extension.
0
4 weeks ago
#8
I got 2.4N
0
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