Forces and Motion: The Basics
This lesson introduces Year 7 students to the fundamental concepts of forces, including types of forces, how to measure them, and how to calculate resultant forces. It clarifies the common confusion between mass and weight and explores how unbalanced forces lead to changes in motion.
Learning objectives
- Identify and distinguish between contact and non-contact forces.
- Calculate the resultant force acting on an object along a straight line.
- Explain the difference between mass and weight using appropriate units.
- Describe the effects of balanced and unbalanced forces on an object's motion.
Lesson plan (60 minutes)
Introduction · 5 min
Do Now: List as many different types of forces as you can think of in two minutes. Recap gravity and magnets from KS2.
Explicit Instruction · 10 min
Teacher Explainer: Using the 5-step script to define forces, vectors, and contact vs non-contact forces. Introduce Newton meters.
Guided Practice · 10 min
Worked Example: Demonstrate how to calculate resultant forces on the board using box diagrams. Explain 'Balanced' vs 'Unbalanced'.
Independent Practice · 20 min
Differentiated Worksheet Activity: Students work through Support, Core, or Stretch tasks based on prior attainment.
Review · 10 min
Formative Quiz: 8-question multiple choice quiz to check for misconceptions.
Closure · 5 min
Plenary: Peer-marking and summary of the three laws of motion (brief overview).
Key vocabulary
- Force
- A push or a pull acting on an object.
- Newton
- The unit used to measure force (N).
- Resultant Force
- The overall force acting on an object after all individual forces have been combined.
- Friction
- A force that opposes motion between two surfaces that are touching.
- Contact Force
- A force that acts only when two objects are physically touching.
Core worksheet (first questions)
- A box has a 5N force pushing it to the left and a 15N force pushing it to the right. Calculate the resultant force and its direction.
- If the resultant force on an object is 0N, what two things could the object be doing?
- Which force acts against a car as it moves through the air at high speed?
- Explain the difference between mass and weight. Include the units for both.
Quiz (sample)
1. What is the unit of force?
- A. Kilograms (kg)
- B. Newtons (N)
- C. Joules (J)
- D. Metres (m)
2. Which of these is a non-contact force?
- A. Friction
- B. Air resistance
- C. Magnetism
- D. Upthrust
3. Which piece of equipment is used to measure force?
- A. Weighing scales
- B. Force meter
- C. Thermometer
- D. Ruler
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