# Hartismere School

Est. 1451. An outstanding coeducational secondary school & sixth form college and England's first academy # Physic :: P5

P5 Space for Reflection

RESOURCES

Satellites, gravity, circular motion and Satellite communication

See item below

Lesson 3: P5b Vectors and equations of motion

1) List of vectors 2) Test  <<CLICK Questions using the SUVAT equations of motion

Answers available on request.

Homework: Finding the acceleration due to gravity, experimental write up. Due 28th Jan

•Aim: To find the acceleration due to gravity
•Diagram:
•Measurements:
•Equation and working:
•How are errors minimised? How precise were the measurements taken for the time? What difference would there have been if we had used a pupil and a stopwatch? Why?

Lesson 4: P5c Projectiles

The Monkey and the hunter <<Further explanation of the demo carried out in class   Lesson 5: P5d Action and Reaction

a) Pressure: See applet below

Make sure you can use the kinetic model to explain pressure in a gas:

Gasses consist of many small particles all moving randomly inside a container. The fast moving particles collide with the walls of the container they are in and bounce off exerting a force on the wall in the process.

When a gas particle collides with a wall in exerts a force on the wall. Pressure = Force / Area and all the collisions add up to a force on the wall divided by the area which is the pressure of the gas.

The force of the particles on the walls is one force in an interaction pair, the wall exerts and equal and opposite force on the particle which is the force needed to change the particle's momentum (rebound it off in another direction).

When a gas is heated the particles gain more kinetic energy and move with a greater velocity. This means there is less time between collisions and therefore more collisions (higher pressure) and also harder collisions as the particles have a greater change of momentum when they collide.

b) Momentum

m1u1 + m2u2 = (m1+m2)v

How to use conservation of momentum to carry out calculations

C) Newtons Third Law Lesson 6 P5f: Nature of waves

A) Interference Revision link

Keywords from this lesson: Use your notes and the link above to make sure you can write a definition of each of the words below. The definition can include a diagram.

Interference

Constructive interference

Destructive interference

Coherent source

Wave Phase

Diffraction or interference pattern

B) Polarised light: Light that is reflected of certain shiny surfaces it is partly poloarised, wearing polariod sunglasses can cut out this glare.

c) Waves vs Particles......Dr Quantum....

Lesson 7 P5g: Refraction of waves

You need to describe refraction by referring to the refractive index of each material and explain that the incident ray slows down in the more dense (higher n) material and bends towards the normal line with the reverse being true at the boundary between the more dense and less dense material when the ray exits. See diagram below: The refractive index of a material is calculate by dividing the speed of light in a vacuum by the speed of light in the medium: n = c/v

n = refractive index

c = Speed of light in a vacuum = 3 x 108m/s

v = Speed of light in the medium in m/s

Make sure you can rearrange the formula (create a formula triangle) and use standard from correctly to work out the speed of light in different mediums. Use the table below to work out the speed of light in different mediums. Can you use the refractive index to explain dispersion by a prism?

Refractive index of Red light in glass = 1.514

Refractive index of blue light in glass = 1.523 Total internal reflection. Make suer you can draw the path of light in an optic fibre and explain the importance of the critical angle. EXCELLENT WEBSITE ON THIS TIR TIR <<CLICK IT<<<<<

Lesson 8 P5h: Optics

Magnification = Image size / Object size

Make sure you can do all the ray diagrams. When using the app below make sure you select principal rays to match what you have done in class

REVISON

DIGITAL EXERCISE BOOK LINK www.hartismere.com/deb/1010   www.hartismere.com/deb/1010

Revision Link http://www.docbrown.info/page20/ocrgatewayp5.htm

Complete the revision booklet - ITEM BELOW

Do past paper questions - See Mr Burroughs for CGP papers, Specimen is on the P6 page