Speed and velocity, speed as distance over time; acceleration; distance-time and velocity-time graphs — WJEC GCSE Physics
In summary: Speed and velocity, speed as distance over time; acceleration; distance-time and velocity-time graphs is a key topic in WJEC GCSE Physics. Key exam tip: Always check if the question asks for speed or velocity to ensure the correct terminology is used
Exam Tips for Speed and velocity, speed as distance over time; acceleration; distance-time and velocity-time graphs
- Always check if the question asks for speed or velocity to ensure the correct terminology is used
- When calculating acceleration from a velocity-time graph, ensure you use the gradient of the line
- Remember that the area under a velocity-time graph is equal to the distance travelled
- Ensure units are consistent before performing calculations
- For higher tier, be prepared to select and rearrange the more complex kinematic equations provided in the formula list
Common Mistakes
- Confusing distance (scalar) with displacement (vector)
- Confusing speed (scalar) with velocity (vector)
- Incorrectly interpreting the gradient of a distance-time graph as acceleration instead of speed
- Failing to recognize that the area under a velocity-time graph represents distance travelled
- Applying uniform acceleration equations to situations where acceleration is not constant
Marking Points
- Distinction between scalar and vector quantities (distance/displacement, speed/velocity)
- Recall of typical speeds for wind, sound, walking, running, cycling, and transportation
- Recall of acceleration in free fall on Earth (10 m/s²)
- Understanding that circular orbit motion involves constant speed but changing velocity
- Application of distance = speed × time
- Application of acceleration = change in velocity / time
- Interpretation of motion graphs to determine speed, acceleration, and distance
- Application of kinematic equations for uniform acceleration (v = u + at, x = 0.5(u+v)t, v² = u² + 2ax, x = ut + 0.5at²)
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