Chapter P4 - Explaining Motion
- Describing motion - speed, velocity, acceleration, distance-time graphs, speed-time graphs; displacement-time graphs, velocity-time graphs.
- Forces - Newton's laws, interaction pairs, resultant forces, how forces affect motion, momentum
- Work and energy - work done, gravitational potential energy, kinetic energy
- Download P4 checklist
- Bitesize P4 revision page
- Click here for my StudyStack activities on Explaining Motion.
- Download Names of Forces Sheet. These are the names of forces that are commonly used in the exams. Practise using these words so you can understand exactly what a question means and so you can correctly describe the forces in a situation. Try this Names of Forces Quiz.
- Interaction Pairs Quiz - check your understanding of Newton's Third Law.
- Buoancy forces - Visualise the buoyancy and weight force on an object in a fluid.
- Practice Long Answer Questions with some guidance, but no suggested points for answers yet.
- examples of LOR questions and answers from OCR
Measuring Speed and Distance Time Graphs
- Click here for my some excellent powerpoints on forces and motion from Staffordshire Learning Net.
- Click here for Usain Bolt's 100m Beijing world record on youtube.
- Click here for PheT's Moving Man simulation - to explore displacement-time and velocity-time graphs.
Newton's Three Laws of Motion
- An object will not accelerate (speed up, slow down or change direction) if there is NO resultant force on it.
- If an object experiences a resultant force, then it accelerates - its acceleration is proportional to the force and inversely proportional to the mass of the object.
- Forces come in pairs - if A exerts a force on B in one direction, then B exerts a force on A in the opposite direction; the force is the same size and the same type.
Physics Tracker SoftwareClick here to download "Physics Tracker" software. I use this to analyse regular and high speed video of experiments we do in class.