This means that with each movement, the speed and height of rise decreases. In each movement, energy is dissipated to the surroundings as heat, due to the friction between the wheels and the surface of the ramp. As it ascends the other side, kinetic energy decreases and GPE increases so the speed decreases. As it descends the ramp, kinetic energy increases, meaning the speed increases. This turns into kinetic energy as it falls. Īs the vehicle moves up the ramp it gains gravitational potential energy. Use ideas of energy to explain the motion of the vehicle. it moves backwards and forwards on the track several times, with each move becoming lower and lower and the top speed becoming slower and slower.it rises up the right side of the track, slowing down as it moves upwards.it travels down the track, speeding up as it moves.the vehicle is pulled up the left side of the track, and is then released.Sample question 2 - Foundation QuestionĪ simple roller coaster has one line of track on which a vehicle travels backwards and forwards. You should give details of both normal and icy roads and mention the forces that are between the wheel and the road.
BACKWARDS QUESTION MARK FULL
When writing your answer, write in clear concise language and full sentences. Write down the force pair that makes the car move and the effect of an icy road vs a normal road when it comes to driving. A good idea is to plan your response before writing it. To get into the five to six mark band for this question there needs to be a well-developed line of reasoning and your answer needs to be clear and logically structured. When the road is icy there is little or no friction between the wheel and the road - this means there is less grip and the force exerted is a lot less. In normal driving conditions there is friction between the wheel and the road - the wheel grips the road and a force is exerted. The rotating wheel pushes the road in a backwards direction, and the road pushes back on the wheel in the forward direction - this is the force pair and the resultant force moves the car forward. OCR 21st Century Science, GCE Physics, Paper A182, June 2015. You may draw labelled arrows on the diagram to help you answer the question. Use ideas about forces to explain how the rotation of a wheel makes the car move forward and why it is more difficult to get the car moving when the road is icy. When the road is icy, it is more difficult to get the car moving. The rotation of a wheel causes the car to move forward. This question is about the forces that make a car move forwards. Similarly, if the question asks you to discuss both sides of an argument, or explain two observations, you will be limited to the lowest level if your answer only considers one of them (no matter how brilliantly written or comprehensively explained that one is!). An answer that is not clear and logically sequenced, and which does not give a coherent argument supported by evidence, will be limited to the lower levels. Six-mark questions are marked using a levels-based mark scheme. support explanations using scientific knowledge and understanding.maintain a sustained line of reasoning, rather than a random list of statements and sentences.write clearly, linking ideas in a logical way.write your answer in full sentences, not bullet points.use appropriate scientific words and terms.Without a plan it is easy to stray away from the key point and lose marks, get steps in a process in the wrong order or forget key bits of information. It is wise to plan your answer rather than rushing straight into it. Six-mark questions are extended free-response questions, requiring the longest answers. There will be two six-mark questions in the Depth paper. Six-mark questions will only appear in the Depth paper.