Movement and Interactions: Forces, Energy and Electricity
The physics that ties motion together: how a resultant force changes movement, how energy is stored and transferred without being lost, and how current, voltage and resistance work in circuits.
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Forces, energy and electricity ⚡
This topic brings together forces, energy and electricity. A resultant force changes how an object moves. Energy is stored and transferred but never created or destroyed. In electric circuits, current, potential difference and resistance are linked. Many questions here need calculations, so learning the equations matters.
Words for the physics 🔑
Learn these four terms before you work through the ideas.
Series and parallel 🆚
Circuits can be wired in two main ways.
Grade 9 thinking 💡
To reach the top grades, learn the key equations and use them: force equals mass times acceleration, and potential difference equals current times resistance. Always show your working in calculations.
Match the quantity to its unit 🔗
- force
- energy
- power
- current
- newtons
- joules
- watts
- amperes
Match the term to its meaning 🧩
- resultant force
- acceleration
- resistance
- efficiency
- the single overall force on an object
- how quickly velocity changes
- how much a component opposes current
- the fraction of energy transferred usefully
What does a resultant force do? ❓
What happens when a resultant force acts on an object?
- It accelerates in the direction of the force.
- It keeps moving at a constant velocity.
- It always stops at once.
Energy stores ✅
Select the TWO energy stores.
- Kinetic energy.
- Gravitational potential energy.
- Electric current.
- Resistance.
Order the cause and effect 🪜
An interactive activity.
Summarise the physics 📝
A resultant _____ makes an object accelerate. The equation force equals mass times _____ links them. Energy is measured in _____ and is never created or destroyed, only transferred. In a circuit, potential difference equals current times _____. The kinetic energy _____ grows as an object speeds up.
Work out the acceleration 🔢
An interactive activity.
Spot the true statements 🖍️
An interactive activity.
Which energy store? 🧭
An interactive activity.
Explain the physics ✍️
An interactive activity.