How to Measure G with a Compound pendulum

  • #1
rossildosil
2
0
For my Advanced Higher Physics Investigation i am measuring acceleration due to gravity. Having already done it with a simple pendulum my teacher says i have to do the same with a "Compound Pendulum". I was wondering how to do this and also how to make a compound pendulum with a steel rod.

Many thanks Ross.
 

Answers and Replies

  • #2
RTW69
374
1
A compound pendulum is one where the rod is not massless, and may have extended size; that is, an arbitrarily shaped rigid body swinging by a pivot. In this case the pendulum's period depends on its moment of inertia I around the pivot point.

T=2*Pi*Sqrt(I/(m*g*L)) where I is the moment of inertia of the rod and L is the distance from the pivot to the center of mass. Measure the period and mass. Locate center of mass and measure distance to pivot. Determining moment of inertia could be the tricky part.
 
  • #3
rossildosil
2
0
Hi thats great. Sorry for the slow reply, but i need to clear something up. Is the T the time taken for one oscilation?

Thanks
 
  • #4
RTW69
374
1
T is the period or how long to complete one complete cycle
 

Suggested for: How to Measure G with a Compound pendulum

Replies
3
Views
156
Replies
12
Views
259
Replies
21
Views
903
Replies
3
Views
606
  • Last Post
Replies
7
Views
503
Replies
18
Views
133
Replies
26
Views
167
Replies
7
Views
678
  • Last Post
2
Replies
41
Views
724
  • Last Post
Replies
6
Views
418
Top