Doc Brown's GCSE OCR 21st Century Science-Physics Revision Notes

PLEASE NOTE NEW revision summaries for the NEW OCR 21st Century Science B GCSE Physics B and NEW OCR GCSE 21st Century Combined Science B Physics courses: Revision for Chapters P1-3 and  STARTING with Y10 in Sept. 2016 onwards, first exams in 2018

OCR GCSE 21st Century Science Physics Module P4 Explaining motion

P4.1 How can we describe motion?

• 1. be apply the following equation to situations where an average speed is involved:

• speed (m/s) = distance travelled (m) / time taken (s)

• s = d/t

• 2. Be able to distinguish between average speed and instantaneous speed (in effect, an average over a short time interval) for examples of motion where speed is changing

• 3. HT only: understand that the displacement of an object at a given moment is its net distance from its starting point together with an indication of direction

• 4. Be able to draw and interpret a distance-time (or displacement-time) graph for an object that is:

• a) stationary

• b) moving at constant speed

• c) HT only: moving with increasing or decreasing speed

• 5. Be able to interpret a steeper gradient of a distance-time graph as a higher speed

• 6. HT only: Be able to calculate a speed from the gradient of a straight section of a distance-time graph

• 7. Be able to draw and interpret a speed-time graph for an object that is:

• a) stationary

• b) moving in a straight line with constant speed

• c) moving in a straight line with steadily increasing or decreasing speed (but no change of direction)

• 8. understand that in many everyday situations, acceleration is used to mean the change in speed of an object in a given time interval

• 9. know that the instantaneous velocity of an object is its instantaneous speed together with an indication of the direction

• 10. HT only: understand that the velocity of an object moving in a straight line is positive if it is moving in one direction and negative if it is moving in the opposite direction

• 11. HT only: Be able to draw and interpret a velocity-time graph for an object that is:

• a) stationary

• b) moving in a straight line with constant speed

• c) moving in a straight line with steadily increasing or decreasing speed (including situations involving a change of direction).

• 12. HT only: Be able to calculate the acceleration from the gradient of a velocity–time graph (or from a speed- time graph in situations where direction of motion is constant)

• 13. Be able to calculate acceleration using the equation:

• acceleration (m/s2) = change in velocity (m/s) / time taken (s)

• OCR GCSE Twenty First Century Additional Science PHYSICS

• Module P4 Explaining motion
• When revising, these pages provide you with a summary of what you need to know and be able to do.

• BUT remember, your primary source of revision are your class notes, investigations and OCR 21st C GCSE science textbooks and classwork worksheets as well as examination practice with past papers.

• PLEASE NOTE My NEW GCSE (9-1) PHYSICS REVISION SUMMARIES for Y10 2016-2017 onwards

AQA GCSE Physics 8463 1st Paper (Topics 1-4, Combined Science Trilogy Physics 1 Topics 18-21)

AQA GCSE Physics 8463 2nd Paper (Topics 5-8, Combined Science Trilogy Physics 2 Topics 22-24)

Edexcel GCSE (9-1) Physics  1st Paper (Topics 1-7 & Combined Science Chemistry 2 Topics 1-8)

Edexcel GCSE (9-1) Physics 2nd Paper (Topics 1, 8-15 & Combined Science Chemistry 2 Topics 1, 8-10, 12-15)

OCR (9-1) Gateway Science GCSE Physics A 1st Paper (Topics P1-4 & Combined Science A physics 1 Topics P1-4)

OCR (9-1) Gateway Science GCSE Physics A 2nd Paper (Topics P5-8 & Combined Science A physics 1 Topics P5-8)

OCR (9-1) 21st Century Science GCSE Physics B Chapters P1-3 (Chapters P1-3, GCSE Combined Science B physics)

OCR (9-1) 21st Century Science GCSE Physics B Chapters P4-6 (Chapters P4-6, GCSE Combined Science B physics)

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