Term 1 Week 9 2020

Homework:

• Ex 4E, p.115-117 Kinematics (earlier week)
• Ex 4F, p.119-124 Projectile Motion (earlier week)
• Ex 4A, p.90-94 Vectors (earlier week)
• Ex 4H, p.132-134, Circular Motion (earlier week)
• Ex 4B, p.97-104 Forces (earlier week)
• Ex 4F, p.143-147 Energy, Work, Power (earlier week)
• Ex 4I, p.137-141, Springs (earlier week)
• Ex 2B, p.16-18, Graphing(Complete these for the upcomming Lab Assessment)
• Ex 2C, p.19-25, Identifying Relationships and Experimental Equations(Complete these for the upcomming Lab Assessment)
• Ex 2B, p.23-40, Level 3 Handout booklet on Graphing Errors (Complete these for the upcomming Lab Assessment)
• Ex 4D, p.108-112, Momentum P = mv (this week)
• Ex 4C, p.105-107, Impulse ΔP = FΔt (this week)


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


Impulse


Impulse examples///Homemade Science with Bruce Yeany


Impulse


Momentum


What is Momentum?





Impulse

Term 1 Week 7 2020

Homework:

• Ex 4E, p.115-117 Kinematics (earlier week)
• Ex 4F, p.119-124 Projectile Motion (earlier week)
• Ex 4A, p.90-94 Vectors (earlier week)
• Ex 4H, p.132-134, Circular Motion (earlier week)
• Ex 4B, p.97-104 Forces (earlier week)
• Ex 4F, p.143-147 Energy, Work, Power (earlier week)
• Ex 4I, p.137-141, Springs (this week)

PhET - Hooke's Law & Springs - HTML

Hooke's Law

Hooke's Law Introduction - Force of a Spring

Hooke's Law F = -kx

Elastic Potential Energy

Intro to Springs and Hooke's Law

Potential Energy Stored in a Spring

How Hard Can You Hit A Golf Ball?

Term 1 Week 6 2020

Homework:

• Ex 4E, p.115-117 Kinematics (earlier week)
• Ex 4F, p.119-124 Projectile Motion (earlier week)
• Ex 4A, p.90-94 Vectors (earlier week)
• Ex 4H, p.132-134, Circular Motion (earlier week)
• Ex 4B, p.97-104 Forces (earlier week)
• Ex 4F, p.143-147 Energy, Work, Power (this week)

Energy

Energy can never be created

Energy can never be destroyed

Energy can only change its form (Work is done)

Energy has the ability to make something happen, i.e. to do Work

The unit for energy is the Joule (J)

J = Kgm²s-²  in fundamental units

Perpetual Motion Machine?

A Simple Proof of Conservation of Energy

Work, Energy, and Power

Work, Energy and Power Review

Gravitational Potential Energy and Kinetic Energy Skate Park PhET Link - HTML

Work

Work is a transformation (change) of energy from one form to another form. Work only occurs when something is done.

• Power is the rate at which energy is transformed
• Power is the rate at which work is done
• Unit of power Watt (W = J/s)

Power vs Energy

Work, Energy & Power

Kinetic Energy & Gravitational Potential Energy