I have a slight doubt with this question: https://isaacphysics.org/questions/qmp_ch1_q3?board=qmp_ch1_1_6&stage=all

So to find the period I equated the EPE to KE? I am not sure how to tackle it,help would be appreciated. This is my working

So to find the period I equated the EPE to KE? I am not sure how to tackle it,help would be appreciated. This is my working

Original post by GrizzlyBear24

I have a slight doubt with this question: https://isaacphysics.org/questions/qmp_ch1_q3?board=qmp_ch1_1_6&stage=all

So to find the period I equated the EPE to KE? I am not sure how to tackle it,help would be appreciated. This is my working

So to find the period I equated the EPE to KE? I am not sure how to tackle it,help would be appreciated. This is my working

@mqb2766

Original post by grizzlybear24

I have a slight doubt with this question: https://isaacphysics.org/questions/qmp_ch1_q3?board=qmp_ch1_1_6&stage=all

So to find the period I equated the EPE to KE? I am not sure how to tackle it,help would be appreciated. This is my working

So to find the period I equated the EPE to KE? I am not sure how to tackle it,help would be appreciated. This is my working

Id have thought a sketch would be a v shape and youd analyse motion along the plane(s) so get the distance and resolved acceleration (force) and hence the time? However, isaac isnt giving, so there may be something Im misunderstanding.

(edited 1 month ago)

Original post by mqb2766

Id have thought a sketch would be a v shape and youd analyse motion along the plane(s) so get the distance and resolved acceleration (force) and hence the time? However, isaac isnt giving, so there may be something Im misunderstanding.

I may be completely out of order here, but should you integrate something, it is because in the QMP book it does resolve time in another exercise by integrating. However, I am not entirely sure why they do that. ( infact it is the previous exercise that they integrate in). I can't show the exercise where the integrate nor can I show my working as it does not allow me to upload an image but they essentially use energies (kE and potential )

(edited 1 month ago)

Original post by GrizzlyBear24

I may be completely out of order here, but should you integrate something, it is because in the QMP book it does resolve time in another exercise by integrating. However, I am not entirely sure why they do that. ( infact it is the previous exercise that they integrate in). I can't show the exercise where the integrate nor can I show my working as it does not allow me to upload an image but they essentially use energies (kE and potential )

This is purely kinematics using only suvat NO integration is required.

Find the time taken for the mass to slide down along the slope where you can express the slope distance with the horizontal displacement using trigo ratio.

Multiply the time taken by 4 to get the period.

Original post by Eimmanuel

This is purely kinematics using only suvat NO integration is required.

Find the time taken for the mass to slide down along the slope where you can express the slope distance with the horizontal displacement using trigo ratio.

Multiply the time taken by 4 to get the period.

Find the time taken for the mass to slide down along the slope where you can express the slope distance with the horizontal displacement using trigo ratio.

Multiply the time taken by 4 to get the period.

I got the answer now, but would equating the potential energy to the kinetic energy when the ball is in the juntion, so you get that v=sqrt(2*g*x_0*tan(theta)) and then the time t to go down one slope is t=v/(g*sin(theta)), where v is the velocity calculated using energy and gsing(theta) is the acceleration of the particle? Then multiply by four. Would that also be a good approach or is it a bit nonsense? By the way, thanks for the help I had been with that problem for two days now.

Original post by grizzlybear24

I got the answer now, but would equating the potential energy to the kinetic energy when the ball is in the juntion, so you get that v=sqrt(2*g*x_0*tan(theta)) and then the time t to go down one slope is t=v/(g*sin(theta)), where v is the velocity calculated using energy and gsing(theta) is the acceleration of the particle? Then multiply by four. Would that also be a good approach or is it a bit nonsense? By the way, thanks for the help I had been with that problem for two days now.

Thats ok as well, though the suvat way (resolve along the plane) seems more elementary as its constant acceleration and you can pick the relevvant suvat equation you need, without having to combine two (admittedly simple). Youd have effectively used

v^2 - u^2 = 2as

and

v - u = at

rather than using

s = ut + 1/2 at^2

directly.

(edited 1 month ago)

Original post by mqb2766

Thats ok as well, though the suvat way (resolve along the plane) seems more elementary as its constant acceleration and you can pick the relevvant suvat equation you need, without having to combine two (admittedly simple). Youd have effectively used

v^2 - u^2 = 2as

and

v - u = at

rather than using

s = ut + 1/2 at^2

directly.

v^2 - u^2 = 2as

and

v - u = at

rather than using

s = ut + 1/2 at^2

directly.

Yes, I have tried using energy and I do get the same answer, it is just that I did not simplify.

- Isaac physcs Challenge
- How did you find the SPC Summer school ?
- Isaac physics quantum mechanics primer difficulty level
- Quantum Mechanics Primer Book Questions
- Isaac Physics SPC Summer School
- Studying 'A Cavendish Quantum Mechanics Primer'
- Isaac Senior Physics Challenge 2024
- Senior Physics Challenge 2022
- How many Physics Questions on Isaac Physics
- Advice for getting A*s in A levels
- CHEMISTRY Reading/Watching RECOMMENDATIONS
- Use a simulator to plot the frequency response of the circuit
- Bridge to gap of alevel physics and undergraduate
- Taking a gap year to retake a levels, tips for getting A/A*?
- Isaac physics answers
- What are these a levels and their courses like?
- Senior Physics Challenge Isaac Physics
- Isaac Physics C4a.9
- Tips for A*s?
- GYG: Priya’s perspective (a stem girly in year 12)

Latest

Trending

Last reply 2 weeks ago

Wanting to pursue a career on Astrophysics/Astronomy but bad at maths and sciencePhysics

2

2