You are Here: Home >< Physics

# 6.2 Summary Questions. Question 4 Watch

1. ''An elastic string is stretched horizontally between two fixed points 0.80m apart. Anobject of weight 4.0N is suspended from the midpoint of the string, causing the midpoint to drop a distance of 0.12m. Calculate:
a) the angle of each part of the string to the vertical.
b) the tension in each part of the string.''
How does one go about on drawing a diagram of this situation, will a diagram even make it easier or perhaps it's not needed. Where are the two fixed points located? at the middle of the string? If so, does it mean it gets stretched further since an
object of weight 4.0N is being suspended from the midpoint and causing it to drop by 0.12m?
2. We start by drawing out a diagram of the forces - the fixed points are at either end of the string so a V shape is formed with the 4N at the middle.

To find a) the angle of each part, simply use trigonometry where and use to find .

To find b) the tension T in each part, is another case of trigonometry. If a system is stationary - i.e. the string didn't snap - then we know all the forces in equilibrium, because there is no net movement.

This means that each T and the 4N forces can form a closed triangle, because they must all cancel out. From there, we can split it into a right angled triangle and use trigonometry again to find the hypotenuse, T!
3. Thank you!

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: September 17, 2016
Today on TSR

### 'Entry requirements are a form of elitism'

What do you think?

### I fancy Donald Trump...

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE