Netherlands HAVO 4 (bovenbouw, 2e fase) Physics
Chapters: 5
1. Skills
General skills · Scientific inquiry and design · Modelling and instruments · Judging and deciding · Physics-specific skills
- Research Skills: From a Question to a Finished Project – Research is a careful way of finding an answer. You ask a clear, focused question, plan how to answer it, find information and check that each source can be trusted, collect and analyse your own data, draw a conclusion that the evidence supports, and share it while crediting every source you used.
- The Scientific Method – The scientific method is the careful way scientists find out how the world works. Observe something, ask a testable question, make a hypothesis (a clear, testable guess), test it with a fair experiment (change one variable, measure one, keep the rest the same), repeat and record data, analyse it, draw a conclusion and share it so others can check. Results that fail the test are useful too: they send you back to a new hypothesis.
- Mathematical Modelling: Using Maths to Describe the Real World – A mathematical model is an equation, graph or table that describes a real situation in a simple way. The modelling cycle: understand the real problem → choose variables and make assumptions → build a model (for example linear, quadratic or exponential) → solve and predict → check the answer against real data → improve the model or state its limits. No model is perfect; a good one is simple and close enough to be useful.
- Science, Technology and Society: How Discoveries Change Our Lives – Science finds out how nature works; technology uses that knowledge to make tools and solve problems. Society shapes science too, by asking questions, paying for research and making rules. Big changes such as the printing press, the steam engine, electricity, vaccines and the internet changed how people work, live and think. Every technology has benefits and risks. To decide wisely we look at evidence, weigh benefits against risks, ask who gains and who loses, think about ethics and the future, and use safety rules.
- Matter and Its Measurement – Matter is anything that has mass and takes up space. It can be solid, liquid or gas, and it can be an element, a compound or a mixture. Chemists measure matter in SI units. Every measurement has some doubt, so we write it with the right number of significant figures, use scientific notation for very big or small numbers, and change units with conversion factors.
2. Sound and image technology (part 1)
Vibrations and waves for information transfer
- Sound – Sound is made by vibrating objects. It travels through a medium (air, water, solids) as a longitudinal wave: particles move back and forth, making crowded parts (compressions) and spread-out parts (rarefactions). Frequency (Hz) sets the pitch, amplitude sets the loudness, and speed v = f × λ. Sound cannot travel in vacuum. Humans hear 20 Hz to 20,000 Hz; below is infrasound, above is ultrasound. Reflected sound gives echoes, used and controlled in buildings.
3. Motion and energy
Force and motion · Energy conversions
- Force and Laws of Motion – A force is a push or a pull. Balanced forces (net force zero) do not change motion; an unbalanced force changes speed or direction. Friction opposes sliding. First law: a body keeps its state of rest or uniform motion unless an unbalanced force acts (inertia; heavier bodies have more inertia). Momentum p = mv. Second law: F = ma (rate of change of momentum), 1 N = 1 kg m/s². Third law: forces come in equal and opposite pairs acting on two different bodies. For a system with no outside force, internal forces cancel and total momentum is conserved.
- Work, Energy and Power – Work is done when a force moves an object: W = F × s, measured in joules (J). Energy is the ability to do work. A moving body has kinetic energy ½mv²; a raised body has potential energy mgh. Energy is never made or destroyed, only changed from one form to another. Power is how fast work is done: P = W ÷ t, in watts. Simple machines like levers and pulleys let a small effort move a big load.
4. Materials
Properties of substances and materials · Functional materials
- The Particle Model of Matter – All matter is made of tiny particles that are always moving. In a solid they are close and only vibrate; in a liquid they are close but slide past each other; in a gas they are far apart and move fast in all directions. Heating gives particles more energy: either they move faster (temperature rises) or the forces between them are broken (the state changes while the temperature stays the same). Gas pressure comes from particles hitting the walls.
- Smart and Modern Materials – A smart material changes one of its properties (shape, colour, transparency or electrical output) when something in its surroundings changes, such as temperature, light, force or a voltage. The change is reversible. Key examples: shape-memory alloys like nitinol return to a remembered shape when heated; thermochromic pigments change colour with temperature; photochromic materials darken in UV light; piezoelectric crystals make a voltage when squeezed. Modern materials, which are not necessarily smart, include composites such as carbon-fibre and glass-fibre reinforced plastic, graphene and other nanomaterials, technical and smart textiles, liquid crystals and bio-based plastics. Engineers choose materials by their properties, cost and effect on the environment.
5. Optional domains (choose two)
Optics · Earth and climate · Human body · Technical automation
- Interference (Young's Double Slit) and Single Slit Diffraction – Two coherent sources (same frequency, fixed phase difference) make a steady pattern of bright and dark fringes. At a point on the screen the path difference is Δ = yd/D: bright where Δ = nλ, dark where Δ = (n + ½)λ. All fringes have equal width β = λD/d. A single slit of width a gives diffraction: a bright central maximum of width 2λD/a, with first minima where a sin θ = λ, and weaker side maxima.
- Geophysics: The Physics of the Earth and Its Climate – Geophysics uses physics to study the Earth. Sunlight in must equal heat out, or the planet warms or cools. A greenhouse layer sends some heat back, lifting the average temperature from about -18 °C to about 15 °C. Seismic waves show the layers inside the Earth, and graphs of data show trends.
- Biophysics: The Physics of Living Bodies – Biophysics uses physics to understand the body. The heart is a pump that makes pressure; blood flows through vessels, and narrowing a vessel cuts the flow a lot because flow depends on radius to the power 4. Bones and muscles work as levers. We use units, graphs and safety limits to study and protect the body.
- Control Systems and Feedback – A control system makes a machine or process behave the way we want. Every system has input → process (controller) → output. In an open-loop system the controller does not check the result (a toaster on a timer). In a closed-loop system a sensor measures the output and feeds it back; the controller compares it with the set point and corrects the error (a thermostat, cruise control). Real systems are built from sensors, a controller (electronic circuit, microcontroller or PLC) and actuators (motors, heaters, valves, pneumatic cylinders). Many are now networked (IoT, SCADA) so they can be watched and controlled from far away.