GCSE Physics: Forces and Their Effects

Forces open the second half of GCSE Physics, and the ideas established here — vectors, resultants, work and elasticity — underpin everything from motion graphs to momentum. This quiz secures the foundations with the calculation style the real papers use.

The classification questions come first: scalar versus vector quantities (displacement and velocity carry direction; distance and speed do not), and contact versus non-contact forces, with gravitational and magnetic attraction as the canonical action-at-a-distance examples. The mass–weight distinction gets thorough treatment, because it is the most persistent confusion in the topic: mass as a scalar amount of matter in kilograms, weight as a gravitational force in newtons, connected through the gravitational field strength — applied on Earth and, tellingly, on another planet where g = 4 N/kg, which exposes anyone treating the two as synonyms.

The calculation questions apply three relationships with all values given, per the 2025–2027 equations sheet arrangement. Resultant force from opposing forces along a line (15 N right against 7 N left). Work done as force times distance, in both directions — finding the work and finding the distance. And Hooke's law with a given spring constant, finding extension from force, plus the conceptual boundary: what changes past the limit of proportionality, where the linear relationship breaks down and deformation becomes permanent.

Every question is self-contained with numbers and units, and each explanation names the relationship applied and shows the substitution. The distractors encode the standard slips — adding opposing forces instead of subtracting, swapping mass and weight, and inverting the Hooke's law rearrangement. This set leads naturally into the Motion and Newton's Laws quizzes in the same collection.

• Classify quantities as scalars or vectors and forces as contact or non-contact
• Distinguish mass from weight and connect them through gravitational field strength
• Find resultant forces for forces acting along the same line
• Calculate work done from force and distance in either direction
• Apply Hooke's law with a given spring constant and interpret the limit of proportionality

Topic scope follows the Forces section of the Department for Education's GCSE combined science and physics subject content: scalars and vectors, contact and non-contact forces, weight and gravitational field strength, resultant forces, work done, and forces and elasticity. Reflects the 2025–2027 equations sheet arrangement.