###### Friday 9th June

###### learning outcomes

- To review the work completed so far
- To practice uncerts and practical experiments
- To practice risk assessments

### tasks

- Starting on approximately p14 of the introduction notes complete tutorial 1 & 2
- Make notes on uncerts and quantifying them from chapter 4
- Risk assessment -Go through the powerpoint on the network (higher physics-> intro-> on risk assessment)
- In your classwork jotter answer the questions as you go through the power point
- Complete the practical below and write it up, including hazards, risks and controls.

###### Checking Your Uncertainties.

**Aim:**To find the average speed of a trolley moving down a slope, estimating the uncertainty in the final value.**Apparatus:**1 ramp, 1 metre stick, 1 trolley, 1 stop clock.Instructions:

- Set up a slope and mark two points 85 cm apart.
- Note the scale reading uncertainty.
- Calculate the percentage uncertainty in the distance.
- Ensuring the trolley starts from the same point each time, measure how long it takes the trolley to pass between the two points.
- Repeat 5 times, calculate the mean time and estimate the random uncertainty.
- Note the scale reading uncertainty in the time.
- Calculate the percentage uncertainty in the time.
- Calculate the average speed and associated uncertainty.
- Express your result in the form:

(speed ± absolute uncertainty) m s

^{-1}Write up your experiment and include your risk assessment

- Continue with the tutorials on Uncerts.