Forces and motion — WJEC GCSE Physics
In summary: Forces and motion is a key topic in WJEC GCSE Physics. Key exam tip: Ensure you can derive or select the correct kinematic equation for uniform acceleration
Exam Tips for Forces and motion
- Ensure you can derive or select the correct kinematic equation for uniform acceleration
- Always check if a question requires a vector or scalar answer
- Practice calculating the area under velocity-time graphs by counting squares if the shape is non-linear
- Remember that inertial mass is defined as the ratio of force over acceleration
Common Mistakes
- Confusing scalar and vector quantities
- Incorrectly identifying the physical significance of the area under a velocity-time graph
- Failing to use consistent units when applying kinematic equations
- Misinterpreting the relationship between force and acceleration in Newton's Second Law
Marking Points
- Distinction between vector and scalar quantities (displacement/distance, velocity/speed)
- Interpretation of motion graphs (slope for speed/acceleration, area for distance)
- Application of Newton's First, Second, and Third Laws
- Calculation of momentum and application of the principle of conservation of momentum in one dimension
- Analysis of factors affecting thinking and braking distances
- Application of principles of forces, motion, and energy to vehicle safety features like airbags and crumple zones
📖 Read the full Forces and motion Study Guide
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