OCR Gateway GCSE Physics A topic P2 Forces overview

Topic P2 Forces of OCR Gateway GCSE Physics A (specification J249) is about how forces describe and change motion, how springs deform, how forces turn objects, and how momentum behaves in collisions. It is examined on the Paper 1 or Paper 3 side. This page maps the topic and links to a focused answer page for each part.

The P2 Forces content

Motion and motion graphs (P2.1)

Scalars and vectors, speed, velocity and acceleration, distance-time and velocity-time graphs, gradient and area, and the SUVAT equation at Higher tier. See Motion and motion graphs.

Newton's laws (P2.2)

The three laws, resultant force, mass and weight, friction, drag and terminal velocity, and $F = ma$ and $W = mg$. See Newton's laws of motion.

Springs and elasticity (P2.3)

Elastic and inelastic deformation, Hooke's law, the limit of proportionality, the energy stored in a spring, and the force-extension practical. See Springs, Hooke's law and elasticity.

Moments and levers (P2.3)

The moment of a force, the principle of moments, and levers and gears as force multipliers. See Moments, levers and gears.

Momentum (P2.2)

Momentum as mass times velocity, conservation of momentum in collisions and explosions, force as the rate of change of momentum, and safety features. See Momentum and conservation of momentum.

How P2 is examined

P2 is assessed on the Paper 1 or Paper 3 side, each paper being 1 hour 45 minutes, worth 90 marks and 50% of the GCSE. Section A is multiple choice; Section B is short answer, structured, maths and practical questions, including a six-mark level of response question. Expect calculations across motion, force, springs, moments and momentum, plus graph interpretation and explanations of terminal velocity and crash safety. Momentum and the SUVAT equation are Higher-tier topics.

How to study P2 Forces

1. Recall the core equations. Speed, acceleration, $F = ma$, $W = mg$, moment and momentum are all recall; the SUVAT and spring equations are given.
2. Read graphs precisely. On a velocity-time graph the gradient is acceleration and the area is the distance.
3. Use the resultant force. Always combine forces to the resultant before applying $F = ma$.
4. Master the spring practical. Plot force against extension, find the gradient (spring constant), and identify the limit of proportionality.
5. Link momentum to safety. A longer collision time means a smaller force for the same change of momentum.

For the official specification

OCR publishes the full specification, past papers and mark schemes at ocr.org.uk. Always revise from the current specification and OCR's own past papers, because question style and the equation sheet are board-specific.