Pendulum Prac???? (1 Viewer)

[haz_it_all]

Can sum1 jus gimme a quick run down on the pendulum prac and determining a value for 'g'

 

[Bannanafish]

swing pendulum
measure period
calculate g, T=4pi^2root(l/g)

 

[Inhuman]

You need to graph the results too. The gradient you get from T^2 vs l is equal to 4pi^2/g

 

[ghoolz]

other points include using - small angle for pendulum (ie less than or about 5 degrees, not 45 like some one wrote in our trial and lost marks)
- having a light, inelastic string
- using as long of a pendulum as possible (we done it of the rail of the sencond level and dropped it over the side)
- not allowing external forces to interact (ie if doing it out side make sure theres no wind)
- taking the average of 10 swings to find the period (because of the small time it takes for one swing)

then using the equation T = 2pi . squareroot(l/g)

l = length of pendulum
T = period and
g = gravity

 

[lillaila]

i doubt theyll ask this question this yr.........im taking the chance

 

[Gruma]

i agree it was there last year so it prob wont be there again... but it was in my trial so im cool with it.

 

[helper]

Unlikely to have the same question but likely to be a prac question with similar ideas.

Recognizing what the slope of the line represents.

Increasing reliability of an experiment.

Sooner or later other experimental ideas are going to show up like:
Validity,
Dependent
Independent variables
Risk Assessments