![Page 1: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/1.jpg)
How would you work out how fast does the car have to go?
Video Available
![Page 2: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/2.jpg)
How much force is required to hold together a spinning
galaxy?
Evidence of Dark Matter
![Page 3: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/3.jpg)
![Page 4: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/4.jpg)
What force will these wheels have to endure at 1000
mph?
![Page 5: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/5.jpg)
Investigation into Centripetal Force
or why things go in circles
![Page 6: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/6.jpg)
![Page 7: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/7.jpg)
![Page 8: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/8.jpg)
The Experiment
You will need the following equipment
– A piece of string– A Rubber Bung– A Biro tube– Some 100g and 10g
masses– Weighing scales– IPad to record results
http://www2.southeastern.edu/Academics/Faculty/rallain/plab193/page1/page37/page37.html
Use scales to make M1 = m2
![Page 9: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/9.jpg)
What you are going to doYou are going to work in pairs. One of you needs to- Measure the mass of the bung m2 and place a mass M1 on the end of the string approximately equal to 1.5 m2 (40-50g)
- Pick a length of string to be hanging out of the string holder (Biro tube). You can keep track of what this length is by putting a piece of tape at the bottom of the string holder.
- Make sure while you are swinging the stopper that the tape stays stationary but does not touch the glass.
- Practice getting the thing swinging concentrate on making sure the tape stays constant and the angle between the string and the string holder stays at approx 45o
See Example Video
![Page 10: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/10.jpg)
![Page 11: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/11.jpg)
What you are going to do - The other person needs to set up a table on the IPad.
- To do this open up the Spread Sheet App on the Ipad.
- In column A put the heading R for Radius
- In columns B, C and D put the heading T for Time period
- In column E put the heading Mean T
- In column F put the heading T2 for Time period squared
- You will record the results in this table as it will make it easy to work out a mean and to plot a graph by clicking the graphs tab at the top.
![Page 12: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/12.jpg)
What you are going to do- You are now ready to start the experiment. - While one of you swings the bung around as previously described the other person should count 10 or so periods and time it. - Repeat this process 3 times and calculate the mean to reduce the uncertainty.
- make sure you record these results in the table on your IPad
- Change the length of the string and do it again.
- Do this for 3 - 5 different lengths of string.
- Make a graph of time period squared vs r = distance between bung and string holder (Biro Tube).
![Page 13: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/13.jpg)
What does this all mean
If the angle is 45o then
Fgrav = F centripetal
This means F centripetal = m2 g
http://www2.southeastern.edu/Academics/Faculty/rallain/plab193/page1/page37/page37.html
F Centripetal
Note: g = approx 10N/Kg
![Page 14: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/14.jpg)
What does this proveFrom this we can prove that F = m2v2 / r
using a bit of algebra
F = m2v2 / r can be rearranged to v2 = r F / m2
Previously we worked out F = 10m2
Therefore F / m2 = 10 and this means v2 = 10r
T = 2πr / v can be rearrange to v = 2πr / T
v2 = 4πr2 / T2 substitute for v2 and we get 10r = 4πr2 / T2
Therefore T2 = 1.25 r
Hopefully the slope of our graph is approximately 1.25
![Page 15: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/15.jpg)
Physics in real life
Physicists in the past used these types of experiments to work out relationships between forces, and objects.
Johannes Kepler predicted the orbits of planets
![Page 16: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/16.jpg)
Physics in real life
They used this understanding to develop laws and theories that allowed humankind to achieve great things.
Isaac Newton’s laws got us to the Moon
![Page 17: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/17.jpg)
Physics in real life
In A Level Physics we help develop your ability to spot connections and solve problems. These are key skills to be successful in all businesses not just science.
![Page 18: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/18.jpg)
Course StructureIn year 12 you do the AS Physics modules• Unit 1 – Particles, Quantum Phenomena and Electricity• Unit 2 – Mechanics, Materials and Waves
In year 13 you do the A2 Physics modules• Unit 4 – Fields and Further Mechanics• Unit 5 – Nuclear Physics, Thermal Physics & Option Option Topic – Turning Points which includes
– The discovery of the electron– Wave Particle Duality– Special Relativity
4 hrs lessons + 4 hrs independent study per week
![Page 19: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/19.jpg)
Exams and Coursework
![Page 20: How would you work out how fast does the car have to go? Video Available](https://reader035.vdocuments.mx/reader035/viewer/2022062800/56649e165503460f94b00a1a/html5/thumbnails/20.jpg)
Exams and Coursework