Term 2 Week 5 2016

Homework

Make sure that you have completed:

• Ex 1, p.25-28, Translational Motion
• Q2, Handout, Lab Exercise

New Homework

• Ex 2, p. 41-45, Rotational Motion

Rotational Momentum (Angular Momentum)

For a point mass L = Pr

Linear Momentum times the radius distance between the point mass and the axis of rotation

Momentum: Rotational Linear

Equation: L = I⍵ P = mv

Units: kgm2s-1  kgms-1

• Rotational Momentum and Linear Momentum have different units so they cannot be equated with each other and are independent of each other.
• Rotational Momentum obeys the same law of conservation that Linear Momentum obeys. In the absence of outside forces, total momentum is always conserved.

Precession

Egg Spinning

Rotational Kinetic Energy

Energy: Rotational Linear

Equation: Ek(rot) = ½I⍵2 Ek(lin) = ½mv2

Units: Joule Joule

• Rotational Kinetic Energy and Linear Kinetic Energy have the same unit so they can be equated with each other and are interdependent on each other.
• The law of conservation of total energy can be applied with all types of energy. You will be using mostly gravitational potential, linear kinetic, and rotational kinetic energies.

• Total Kinetic Energy = Ek(rot) + Ek(lin)

= (½I⍵2) + (½mv2 )

Term 2 Week 4 2016

Homework

Make sure that you have completed:

• Ex 1, p.25-28, Translational Motion
• Q2, Handout, Lab Exercise

Rotational Motion:

• Q1, p.31 Rotational Kinematics

Rotational Kinematics

Radian Measure

Radian Measure is used so that we can easily calculate an arc length, d (m), given an angle, 𝛉 (Rad) and the radius, r (m).

d = r𝛉

This in turn allows us to relate velocity, v (ms-1) to angular velocity ⍵ (rads-1), in the same way.

v = r⍵, 

also ⍵ = 2𝝅f

 This also allows us to relate acceleration, a (ms-2), to angular acceleration, α (rads-2), in the same way.

a = rα

The rotational kinematics work just like the translational kinematic equations when there is a constant acceleration.

• ⍵f = ⍵i + αt ⇔ vf = vi + at
• ⍵f2 = ⍵i2 + 2α𝛉 ⇔ vf2 = vi2 + 2ad
•  𝛉 = ⍵it + ½αt2 ⇔ d = vit + ½a2
•  𝛉 = ½(⍵i + ⍵f)t ⇔ d = ½(vi + vf)t

Rotational Inertia

Torque

Term 2 Week 3 2016

Physics 3.1 AS 91521 Lab Investigation

How to use Excel for the lab investigation

Mass on a Spring Part 1 - finding average & period

Mass on a Spring Part 2 - Gathering the Raw Data

Mass on a Spring Part 3 - Transforming the Raw Data

Mass on a Spring Part 3a - Correction on Transforming the Raw Data

Mass on a Spring Part 4 - Applying Uncertainties to your Data

Mass on a Spring Part 5 - Transforming Uncertainties

Mass on a Spring Part 6 - Adding Error Bars to your Graph

Mass on a Spring Part 7 - Line of Worst Fit

Term 2 Week 2 2016

Homework

• Handout Q2, Lab
• Ex 1, p, 25-28 Linear Motion

2D Momentum

Part 1

Part 2

Circular Motion

• Vertical Circle

• Banked Corners

• Orbital Motion

Satellite Motion

Term 2 Week 1 2016

Homework:

• Handout Q2 Lab
• Ex 1, P.21-28 Linear Motion

Translational Motion

Linear Motion

• Newton’s Laws of Motion

Newton's Third Law

• Free Body Diagrams

Tension Free Body Diagram

• Center of Mass

Term 1 Week 11 2016

Assessment Week for Phy 3.7 Socio-Scientific Issue

Then Introduction of Errors for Phy 3.1 Lab Investigation

• Analog Scale: error is half the smallest scale division
• Digital Reading: error is the one of the last digits on the reading
• Adding or Subtracting: Add the actual errors
• Multiplying or Dividing: Add the percentage errors
• Power: Multiply the percentage error by the power