Year 11 - Science
Forces in two dimensions
Forces make things change
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores forces, interactions, and Newton's laws, including motion, rotation, and momentum. It covers reaction times, stopping distances, and deceleration dangers. Emphasis is on force diagrams, calculations, experiments, and evaluating methods for accuracy and safety.
Lesson Summary
You will learn to draw and interpret free body force diagrams to describe the resultant force on an object.
Key Notes
- A free body diagram shows all of the forces acting on a single object.
- The resultant of two forces can be determined by adding individual forces on a vector diagram.
- The resultant of two perpendicular forces is in a different direction from either of these forces.
Vocabulary To Learn
- resultant force: A single force that represents the effect of all the forces acting on an object.
- equilibrium: The state of an object if there is no resultant force acting on it.
- vector diagram: A drawing in which forces are drawn end–to–end, and to scale, which can be used to find a resultant force.
Common Mistakes To Avoid
- The velocity of an object must be in the same direction as the resultant force acting on the object.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
A free body diagram shows all of the forces acting on a single object. The resultant of two forces can be determined by adding individual forces on a vector diagram.
2. Define this scientific word and use it in context. 'resultant force'
A single force that represents the effect of all the forces acting on an object. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: The velocity of an object must be in the same direction as the resultant force acting on the object. Correction: Invite pupils to consider situations in which the resultant force is not in the same direction as the velocity, such as an object that has been thrown upwards and is slowing down as its height increases.
More Lessons In This Unit
- Balancing Study Guide
- Changing momentum Study Guide
- Conservation of momentum Study Guide
- Force, mass and acceleration (a = (v – u)/t) Study Guide
- Force, mass and acceleration (a = Δv/t) Study Guide
- Forces in two dimensions (including resolution of a force) Study Guide
- Moments, levers and gears Study Guide
- Newton's Second Law Study Guide
- Newton's Second Law (including inertia) Study Guide
- Newton's Third Law Study Guide
- Newton's Third Law (with free body diagrams in 2D) Study Guide
- Resultant forces and their effects Study Guide
- Stopping Study Guide
- Stopping (and estimating stopping distances) Study Guide
- Stopping safely Study Guide
- Terminal velocity Study Guide
- Terminal velocity (including graphical representation) Study Guide
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