YEAR 2 - Practical 1 : Investigating Circular Motion Flashcards
Which formula are we using to measure the mass of a rubber bung?
F = mv^2/r
Equipment
Stopwatch
Clear use
Bung on strong
Slotted masses (up to 500g)
How is the bung rotated?
By holding the clear tube and the weight is held until it is balanced by the bung rotating
What ensures a constant radius?
A marker on the string
When is the stopwatch started?
When the bung passes a fixed marker relative to the experimenter
When does counting starts
As the stopwatch is pressed at zero
When is the stopwatch stopped?
At count 20 rotations
How much is the uncertainty reduced by doing 20 rotations instead of 1?
By a factor of 20
What is the range of weights and the increments in which they’re increased?
0.10kg to 0.50kg
How is T calculated?
By dividing T20 by 20 for each weight
Equation used to curate the velocity
V = 2pir/T
What type of graph is plotted and what gradient would this give?
F versus V^2
Gradient m/r
How is m calculated?
Gradient x r
How can we check our results?
Using a balance
When are the rotations slowest and why?
With lower weights as there’s a smaller force, therefore the rotations are slower
