Phys - Practical

Question 1

Uncertainty of Measurements

Answer 1

Resolution of instruments
Given
Maximum - minimum / 2

Question 2

Resolution of Calipers

Answer 2

0.01mm

Question 3

Significant Figures In Table

Answer 3

Same across individual columns

If operations performed with two measurements, use smaller sig fig for result

1 or 2 sig figs for uncertainties

Resolutions & units in headings

Question 4

Checking That Graph Agrees WIth Equation

Answer 4

1. Linear relationship between y & x
2. Regression line passes through all data points / error bars
3. For min/max, min & max regression lines straddle / don’t origin

For regression, regression line passes / doesn’t origin

Question 5

Why Does The Theoretical Result Not Align With The Practical Result?

Answer 5

There is something not considered / taken into account in the theoretical equation; mass of spring, dissapative forces etc

Question 6

Ways In Which You Could Improve The Experiment?

Answer 6

Increase range of independent variable

Increase number of independent variable values tested witin the existing range of values

If not done already, repeat readings to find anomalies and mean

Use instruments with a smaller resolution

Check for reproducibility with other students

Question 7

Effect of Parallel And Series Springs

Answer 7

In parallel,
k = k1 + k2

In series,

k = 1/(1/k1 + 1/k2)

Question 8

Circuit of Varying P.D

Answer 8

Use a D.C cell and a varying resistor (rectangle with arrow from bottom left to top right)

Question 9

Plan Steps

Answer 9

Describe the method of the experiment; Mention:
- instruments used
- independent (how many values you will test), dependent and control variables
- how you will plot the graph and find m and c
- trial readings
- repeat readings
- accounting for zero error and parallax error (if appropriate)
- logarithmic equation (if appropriate)