A student investigates forces using three cords attached to a lightweight ring. The ring is stationary, the cords lie in the same plane and the weight of the ring is negligible.
Cord A extends due west from the ring and pulls with a force of 4.0 N.
Cord B extends at 30∘30^{\circ}30∘ north of east from the ring.
Cord C extends at 60∘60^{\circ}60∘ south of east from the ring.
Use a scale of 1.0 cm=0.50 N1.0\ \text{cm}=0.50\ \text{N}1.0 cm=0.50 N.
State the name of the force that each cord exerts on the ring.
When the three force arrows are drawn tip to tail, they form a closed triangle.
Explain why.
A student starts a scale vector construction by drawing an 8.0 cm arrow due west for the force from cord A.
Describe how the student should complete the construction to find the forces from cords B and C.
Give an estimate for each force.
93 exam-style questions on Edexcel GCSE Physics 9.1 Forces and vectors, covering 9.1.1 Interactions and types of force, 9.1.2 Vector and scalar quantities, and 9.1.3 Vector diagrams and free body diagrams. Each one has a worked solution and a mark scheme showing where the marks go.