You are Here: Home >< Maths

# M2 Mechanics question Watch

1. What does freely hinged mean? Does it mean it always have 2 reactions x and y?
2. (Original post by Bealzibub)
What does freely hinged mean? Does it mean it always have 2 reactions x and y?
"Freely hinged" means that the rigid body is being held in place from a certain point. Imagine the following example: a sheet of paper (lamina) is held in place from its corner by a pin. Here, the pin is acting as the hinge and if the hinge were not exerting a reaction force on the lamina, the lamina would just fall down due to its weight.

A hinge exerts one reaction force, but for the sake of simplicity we break this reaction force into its constituent horizontal and vertical components X and Y.

You will often find a later part of a moments question to "find the magnitude and direction of the reaction force". This is basically using Pythagoras' theorem on X and Y and finding the angle at which the reaction force acts and its magnitude.

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: April 1, 2016
Today on TSR

### Last-minute PS help

100s of personal statements examples here

### Loneliness at uni

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
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
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

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.