Introduction to Forces and Motion
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Introduction to Forces and Motion
AS92045 - Physical Phenomena Investigation Year 11 Physics 90 Minutes
WALT - We Are Learning To
Understand how forces work in our world Explain balanced vs unbalanced forces Describe force pairs (Newton's 3rd Law) Apply Newton's Laws of Motion Solve force problems with calculations Investigate physical phenomena scientifically
Success Criteria
I can identify forces acting on objects I can distinguish between balanced and unbalanced forces I can explain Newton's three laws with examples I can calculate force using F = ma I can investigate forces using scientific methods I can connect forces to Māori understanding of natural phenomena
DO NOW - Think-Pair-Share
Think: What happens when you push a stationary object? Pair: Discuss with your partner Share: Give examples of forces you observe daily Consider: How do Māori understand natural forces?
What is a Force?
A push or a pull Measured in Newtons (N) Can change motion or shape Always acts in a specific direction
Types of Forces
Contact Forces: Touch is required - Friction, Normal force, Tension Non-contact Forces: Act at a distance - Gravity, Magnetic, Electric All forces have magnitude and direction
Force Hunt Activity
Look around the classroom Identify 5 different forces Classify as contact or non-contact Draw arrows showing force direction Share findings with class
Balanced Forces
Forces that cancel each other out Net force = 0 N Object remains at rest or constant velocity No change in motion occurs Example: Book resting on a table
Unbalanced Forces
Forces that do not cancel out Net force ≠ 0 N Object accelerates or changes motion Motion can start, stop, or change direction Example: Pushing a shopping trolley
Balanced vs Unbalanced Investigation
Use spring scales and blocks Measure forces in different scenarios Record when forces are balanced/unbalanced Observe resulting motion Complete data table
Māori Perspective on Forces
"Kia mau ki te whakapono - Hold fast to your beliefs" Traditional Māori understanding recognizes the interconnectedness of all forces in nature Kaitiakitanga - guardianship of natural forces and balance
Newton's First Law
Law of Inertia An object at rest stays at rest An object in motion stays in motion Unless acted upon by an unbalanced force Inertia = resistance to change in motion