How is biomechanics examined in WJEC A-Level PE?

Biomechanics is assessed within the A2 written paper through structured and extended questions that apply the principles to sporting examples. Expect to classify a lever, name a plane and axis, apply Newton's laws to a named action, use the conservation of angular momentum, identify the factors of release, and explain drag, lift or the Magnus effect. Simple resolution of velocity and reading of motion graphs also appear.

What are the most common mistakes in biomechanics?

The big ones are mixing up second and third-class levers, pairing the wrong axis with a plane, stating Newton's third law without naming both forces, saying angular momentum increases when a skater pulls their arms in (it is conserved; angular velocity rises), always quoting 45 degrees as the optimum release angle, and saying fast-moving air has high pressure (Bernoulli is the opposite).

How do I revise levers, planes and axes?

Learn the three lever classes by what lies in the middle (fulcrum, load or effort) and remember the mnemonic that first class has the fulcrum in the middle, second class the load, third class the effort. Pair each of the three planes with its axis (sagittal-transverse, frontal-sagittal, transverse-longitudinal) and practise naming the plane and axis for somersaults, cartwheels and spins.

How does angular momentum work in WJEC PE?

Angular momentum equals moment of inertia times angular velocity and is conserved once a performer is airborne or on near-frictionless ice (no external torque). Moment of inertia depends on mass and, mainly, how far that mass is from the axis. So pulling the body in lowers the moment of inertia and, because angular momentum is constant, the angular velocity rises and the performer spins faster. Practise the skater and diver examples.

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WJEC A-Level PE Biomechanics and Movement Analysis: a deep dive on levers, Newton's laws, angular motion, projectiles and fluid mechanics

Q: What does the biomechanics content of WJEC A-Level PE cover?

The biomechanics and movement analysis content covers the analysis of movement using levers, planes and axes; Newton's three laws of motion and the quantities of linear motion; angular motion, moment of inertia and the conservation of angular momentum; projectile motion and the factors of release; and fluid mechanics, including air resistance and drag, the Bernoulli principle and the Magnus effect. It is examined within the A2 written paper and supports the analysis of performance.

A deep-dive WJEC A-Level PE guide to the Biomechanics and Movement Analysis content. Covers levers, planes and axes, Newton's laws and linear motion, angular motion and the conservation of angular momentum, projectile motion, and fluid mechanics including Bernoulli and the Magnus effect.

Generated by Claude Opus 4.820 min readWJECUpdated 2026-06-16

Reviewed by: AI editorial process; not yet individually human-reviewed

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What the biomechanics content demands
Levers, planes and axes
Newton's laws and linear motion
Angular motion
Projectile motion
Fluid mechanics
How biomechanics is examined
Check your knowledge

What the biomechanics content demands

Biomechanics and movement analysis is the most quantitative part of WJEC A-Level Physical Education. It applies the physics of force, motion, rotation and fluids to sporting movement. Examiners test two linked skills: the precise recall of definitions and laws, and the application of them to named sporting actions, with some resolution of vectors and reading of graphs.

This guide walks through the five clusters in a sensible build order, then sets out the exam patterns WJEC repeats. Each cluster has a matching dot-point page with practice questions; this overview ties them together.

Levers, planes and axes

Start with movement analysis. A lever has a fulcrum, an effort and a load, and the three classes are defined by what sits in the middle: first class (fulcrum), second class (load, with mechanical advantage greater than one), and third class (effort, giving range and speed but mechanical disadvantage). Most body levers are third class. Then learn the three planes and their axes as fixed pairs: the sagittal plane about the transverse axis (somersaults, squats), the frontal plane about the sagittal axis (cartwheels), and the transverse plane about the longitudinal axis (spins). To analyse a movement, decide the direction of the joint action, then name the plane and axis.

Newton's laws and linear motion

Next, the laws that govern straight-line movement. Newton's first law is inertia, the second is acceleration ( $F = ma$ ), and the third is the equal and opposite reaction, which gives the ground reaction force. Apply all three to a sprint start. Then learn the linear quantities, keeping scalars (distance, speed) distinct from vectors (displacement, velocity), and define momentum as mass times velocity. Finish with motion graphs: on a distance-time graph the gradient is speed, while on a velocity-time graph the gradient is acceleration and the area is distance.

Angular motion

Now rotation. A torque starts rotation, angular velocity describes its rate, moment of inertia is the resistance to changing it, and angular momentum is the quantity of rotation (moment of inertia times angular velocity). The single most important idea is the conservation of angular momentum: once airborne or on near-frictionless ice there is no external torque, so angular momentum stays constant. Changing body shape changes the moment of inertia, so the angular velocity changes inversely. Master the skater and diver examples.

Projectile motion

Projectiles are governed by three release factors (speed, angle and height) and two forces (weight and air resistance). The optimum angle is about 45 degrees only when release and landing heights are equal; for objects released above the ground, such as a shot put, it is slightly less. Resolve the release velocity into a constant horizontal component and a changing vertical component. When weight dominates (a shot), the path is a true parabola; when air resistance is significant (a shuttlecock), the path is distorted and asymmetrical.

Fluid mechanics

Finally, the effects of moving air and water. Drag opposes motion and grows with velocity, frontal area, surface roughness and a less streamlined shape, so athletes tuck, smooth their kit and streamline equipment. The Bernoulli principle (faster air, lower pressure) produces a lift force. The Magnus effect uses spin to create a pressure difference and a sideways or vertical force, letting a footballer bend a free kick or a tennis player apply top spin to make the ball dip.

How biomechanics is examined

A typical WJEC profile for this content:

Classification and naming. Identifying a lever class and its mechanical advantage, and naming the plane and axis of a movement.
Application of laws. Applying Newton's three laws to a named action, and the conservation of angular momentum to a spin or somersault.
Calculation. Resolving velocity into components, finding acceleration and distance from graphs, and computing momentum.
Extended answers. Projectile release factors, the parabola versus distorted path, and the Magnus effect are all predictable extended questions.

Check your knowledge

A mix of recall and application questions covering the whole biomechanics content. Attempt them under timed conditions, then check against the solutions.

Identify the lever class at the elbow during a biceps curl and state its mechanical advantage. (2 marks)
Name the plane and axis of a cartwheel. (2 marks)
Apply Newton's three laws to a sprinter leaving the blocks. (6 marks)
Define momentum and explain how a rugby player increases it. (3 marks)
Explain, using the conservation of angular momentum, how a diver speeds up their somersault. (4 marks)
State the three factors of release that affect the horizontal distance of a projectile. (3 marks)
Explain why a shot put follows a true parabola but a shuttlecock does not. (3 marks)
Explain how the Magnus effect makes a football swerve. (4 marks)

Solutions

Q1: The elbow in a biceps curl is a third-class lever (the effort, from the biceps, lies between the fulcrum at the elbow and the load in the hand). It has a mechanical disadvantage (less than one) but gives range and speed.
Q2: A cartwheel is in the frontal plane about the sagittal axis, because it is a sideways rotation.
Q3: First law: the sprinter stays in the blocks until they push (inertia). Second law: the driving force produces an acceleration proportional to the force and inversely to their mass ( $F = ma$ ). Third law: they push back and down on the blocks, and the blocks push them forward and up with an equal and opposite ground reaction force.
Q4: Momentum is mass times velocity. A rugby player increases it by running faster (greater velocity) or by moving more mass into contact, making them harder to stop.
Q5: Once airborne there is no external torque, so angular momentum is conserved. Tucking lowers the moment of inertia, so the angular velocity must rise to keep angular momentum constant, and the diver rotates faster.
Q6: Speed (velocity) of release, angle of release, and height of release.
Q7: A shot has a large weight and small air resistance, so weight dominates and the path is symmetrical. A shuttle is light with large air resistance, which distorts the path into an asymmetrical, steeper descent.
Q8: Spin drags a boundary layer of air around the ball; air speeds up and pressure falls on one side and slows and rises on the other; the pressure difference produces a sideways Magnus force that curves the ball towards the low-pressure side.