Term 1 Week 9 2017

Homework
Ex 4J, p. 143-147 Energy, Work, Power - Complete
Ex 4I, p.137-141 Springs, Hooke's Law & Elastic Potential Energy - Start
Ex 2B & 2C, p. 16-25 Relationships - do this to prepare for the Lab Assessment next week

Hooke's Law

Hooke's Law F = -kx

Elastic Potential Energy

Potential energy stored in a spring | Work and energy | Physics | Khan Academy

PhET Lab on Springs (click here)

Term 1 Week 8 2017

Homework
Ex 4D, p. 108-112  Momentum (Conservation of Momentum) - complete
Ex 4C, p. 105-107  Impuse - complete
Ex 4J, p. 143-147 Energy, Work, Power - start

A Simple Proof of Conservation of Energy

Work, Energy, and Power

Work, Energy and Power Review

Term 1 Week 7 2017

Homework
Ex 4B, p. 97-104 Forces - complete
Ex 4D, p. 108-112  Momentum (Conservation of Momentum)
Ex 4C, p. 105-107  Impuse - start

Relationships Videos (click here)

Linerising Graphs in Physics

Linerisation of Data

Momentum

Conservation of Momentum

In the absence of external forces the total momentum of a system is always conserved

Impulse

The change in Momentum for a single object

ΔP = Pf - Pi

&

ΔP = FΔt

&

ΔP = mΔv

• The unis are eithor Ns or kgms-1 , this is the same unit and the one that is used depends on the context

• Impulse on one object is always equal and opposite to the impulse on the other onject - Newton's Third Law

Physics of Car Crashes (Impulse)

Impulse

Momentum

Term 1 Week 6 2017

Homework:

• Circular Motion Worksheet
• Ex 4B, p.97-104, Forces

Forces

What is a Force?

What Forces are Acting on You?

Newton's Third Law

Newton's Three Laws

Free Body Force Diagram

All the forces are drawn on an object coming out from the object's center of mass. The sum of all these forces is the Net Force

Mass on a Slope Free Body Force Diagram

Free Body Diagrams Sine & Cosine Components

Term 1 Week 5 2017

Homework

• Vectors Worksheet
• Start Circular Motion Worksheet

Vectors

• A vector has a size - how big is it?
• A vector has a direction - which way is it going?
• When adding vectors add head to tail
• When finding a change remember

Δv = vf - vi

Using Vectors in Projectile Motion

Circular Motion

• Velocity is always at a tangent to the circle. Even if the speed remains constant, the velocity is changing because it is accelerating.

vc = 2𝝿r/T

• Centrapetal Acceleration is always toward the centre of the circle.
• ac = mv2/r
• Centapetal Force is the Net Force, and is also always towards the centre of the circle.

Fc = mv2/r

Uniform Circular Motion

Term 1 Week 4 2017

Homework
Projectile Motion Worksheet

Use Trigonometry to find your Vertical initial velocity and Horizontal initial velocity component vectors

Projectile Motion follows a Parabolic Path that is Symmetrical about the highest point

Vertical Axis - downward acceleration at g, use kinematic equations

Horizontal Axis - no acceleration due to forces being balanced, use v =d/t

Time, t, is the only scalar (not a vector) so ties both Vertical and Horizontal together

The Vertical and Horizontal Motions are otherwise independant

Beautiful Trigonometry - Nimberphile

Free Fall

Projectile Motion

Term 1 Week 3 2017

Fundamental Units and Compound Units

All other units used in science are made up of a combination of the fundamental units. 

Kinematic Equations

Only used when an object is accelerating

vf = vi + at	← missing d
vf2 = vi2 + 2ad	← missing t
d = vit + ½at2	← missing vf
d = (vi + vf)t/2	← missing a

Choose the kinematic equation based on:

• what quantities you are given
• what quantity is asked for
• what quantity is not involved

Using Kinematic Equations

Algebra Review - Manipulating Equations in Physics

Homework:

Equations of Motion worksheet