SHS3 Physics · Semester 1 Week 12: Dynamics

Lesson notes

Learning Objectives

Indicator: 3.1.3.LI.2 - Use momentum change to establish impulse and hence deduce Newton’s second law of motion.

By the end of the lesson, learners can:

Define impulse as the product of the average force acting on a body and the time for which it acts, and state its SI unit as the newton-second (N s).
Derive the impulse-momentum equation, F × t = mv - mu, from the definition of acceleration and Newton’s second law.
Use the impulse-momentum equation to calculate the average force, time, or change in momentum in given collision problems.
Explain, in their own words, how the concept of impulse explains real situations such as airbags, crumple zones, and following through in sports.
Apply the impulse-momentum relationship to solve problems that require strategic reasoning, including situations where the force is not constant and an average force must be found.

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Curriculum details

Strand: Mechanics and Matter (Strand 1)
Sub-strand: Dynamics (1.3)
Content standard: 3.1.3.CS.1 - Demonstrate knowledge and understanding of collisions 3.1.3.LO.1 Use the concept of momentum change to verify of Newton's second and third laws of motion.
Indicator: 3.1.3.LI.2 - Use momentum change to establish impulse and hence deduce Newton's second law of motion.
Suggested placement: Semester 1, Week 12 (Week 12 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Source document note: The official curriculum document has a fault in this entry, so the curriculum text above is transcribed exactly as printed:

content standard text - p.161: the document prints this content standard code as 3.1.3.C.S.3.1
indicator text - p.161: the document prints this learning indicator code as 3.1.3.LI.1.2
exemplars - p.161: the document prints this assessment code as 3.1.3.AS.1.2
Curriculum reference: NaCCA curriculum document, p. 161

Exemplars (from the NaCCA curriculum)

Enquiry learning:
- Let learners use the principle of conservation of momentum to establish an equation to enable them to determine the common velocity for situations of inelastic collisions.
- Let learners establish equations to enable them to determine the velocity for situations of elastic collisions. i.e., learners must employ conservation of momentum and kinetic energy.
Provide equitable access to resources and opportunities.
Assessment (3.1.3.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.
Teaching and Learning Resources:
- Audio-visuals
- Internet
- Projectors
- YouTube
- Interactive virtual laboratory