# Unit Planner: Forces and Newton's laws

Unit 3: Forces

Start date:

**Diploma assessment**

*When will the content be assessed?*

*Paper 1 xPaper 2 xPaper 3 xInvestigation x*

**Text book reference**

Hamper 52 - 72

#### Inquiry: Establishing the purpose of the unit

**Transfer Goals***List here one to three big, overarching, long-term goals for this unit. Transfer goals are the major goals that ask students to “transfer”, or apply, their knowledge, skills, and concepts at the end of the unit under new/different circumstances, and on their own without scaffolding from the teacher. *

- Bodies don't accelerate unless pushed
- We use laws to solve problems and make predictions

**Content***List here the key content that students will know by the end of the unit *

**Define force as a push or a pull.****Types of force, Tension, weight, Normal, Friction, Air resistance and upthrust.****Pressure = Force/Area****Define momentum and impulse****Newton's 1st****Newton's 2nd****Newton's 3rd****derive F = ma**

**Skills***List here the key skills that students will develop by the end of the unit. *

- Drawing free body diagrams
- Identifying forces
- Finding components of a force
- Resolving vectors
- Measuring force
- Solving problems related to Newton's laws
- Finding the are under a F vs t graph
- Use of a force sensor
- Vectors in Algodoo
- Modeling vectors in GeoGebra

**Concepts***List here the key concepts that students will understand by the end of the unit*

- Weight is related to mass
- Friction is between surfaces
- Normal force is when surfaces are in contact
- Buoyancy is when a body is immersed in a fluid
- If forces are balanced a body is at rest or moving with constant velocity
- Inertia is the unwillingness to move
- Rate of change in momentum is related to Unbalanced force
- Newton's 3rd is about 2 bodies
- Area under F vs t graph gives impulse

**Applications***Examples of real world practical applications of knowledge. *

- Bodies hanging on strings
- Floating box on a table
- Inclined plane
- Accelerating cars
- Alice in the lift
- Masses and pulleys
- Colliding balls
- Water jet
- Jet engine
- Rocket engine
- Recoil
- Filling truck with sand
- Bungee jump

#### Action: teaching and learning through Inquiry

**Approaches to teaching***Tick boxes to indicate pedagogical approaches used. *

*Lecture*

Simulation x

Small group work (pairs) x

Hands on practical x

Video x

Simulation x

Small group work (pairs) x

Hands on practical x

Video x

*Student centred inquiry x*

**TOK***Examples of how TOK can be introduced in this unit *

**The difficulty of defining force.****Why are there so few types of force?****The meaning of the word displaced in Archimedes principle.****The use of laws in Physics****How we quote a law to give a convincing argument.****Do other subjects have laws?****Difference between a Physics law and a "legal law".****Why only 3 laws? Simple is best.****How we define units to make equations simple.****The difference between a Law and a rule.****How the principle of conservation of momentum gives a short cut to using the 3 Laws.****How conservation principles seem to be the basis of a lot of physical models. What is conserved and what isn't?**- How every action has an equal and opposite reaction leads to some common misconceptions.

**NOS***Examples of how NOS can be introduced in this unit. *

- Archimedes and his Eureka moment.
- We can solve problems with 3 dimensional bodies by considering the forces to act at their centre.
- All this stuff about Laws is also very much NOS (Understanding of science).
- The way we make predictions (solve problems) based on a set of laws.
**Occam's Razor.**- How the conservation of momentum can be derived from Newton's laws.

**Assessments***Tests, exams and marked labs*

Forces test

Forces mc test

Forces problems

Newton's 1st law test

Newton's 1st law mc test

1st Law problems

Newton's 2nd law test

Newton's 2nd law mc test

2nd law problems

Newton's 3rd law test

Newton's 3rd law mc test

3rd law problems

Momentum problems

**worksheets and exercises**

**Resources***Video clips, simulations demonstrations etc*.

#### Reflections

**What went well***List the portions of the unit (content, assessment, planning) that were successful *

**What didn’t work well***List the portions of the unit (content, assessment, planning) that were not as successful as hoped *

**Notes/changes/suggestions:***List any notes, suggestions, or considerations for the future teaching of this unit*.