Forces and their interactions — WJEC GCSE Physics
In summary: Forces and their interactions is a key topic in WJEC GCSE Physics. Key exam tip: Always draw a free body diagram if the question involves multiple forces
Exam Tips for Forces and their interactions
- Always draw a free body diagram if the question involves multiple forces
- Ensure units are consistent (e.g., converting cm to m for extension)
- Remember that weight is a force measured in Newtons, while mass is in kilograms
- Check if the force-extension relationship is linear before using F = kx
Common Mistakes
- Confusing mass and weight
- Incorrectly identifying the direction of forces in free body diagrams
- Failing to resolve forces into components when required
- Confusing elastic and inelastic behavior
- Misapplying the work done formula by using distance not in the line of action of the force
Marking Points
- Identification of interaction types: gravity, electrostatics, magnetism, and contact
- Correct use of vector notation for forces
- Definition and calculation of weight using W = mg
- Construction and interpretation of free body diagrams
- Calculation of resultant forces and identification of balanced forces
- Resolution of forces into components at right angles
- Distinction between elastic and inelastic distortions
- Calculation of work done using W = F x d
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