P2.2.6 Streching and Squashing + P2.2.7 Force and speed issues 0.0 / 5 ? PhysicsMotionGCSEAQA Created by: MaddiCreated on: 04-05-14 19:25 How do we measure the extension of an object when it is streched? The extension is the distance between the length of the spring and its original length. 1 of 13 How does the extension of a spring vary with the force applied to it? The extension of a spring is directly proportional to the force applied to it, provided the limit of proportionality is not exceeded. 2 of 13 What is the spring constant of a spring? The spring constant of a spring is the force per unit needed to strech it. 3 of 13 How can we tell when a spring has exceeded its limit of proportionality? The graph of extension against force applied is no longer a straight line. 4 of 13 What is the equation used to work out the force? Force (N) = spring constant (N/m) x extension (m) 5 of 13 How can the fuel economy of road vehicles be improved? Fuel economy of a vehicle can be improved by reducing the speed or fitting a wind detector (making the vehicle more streamline). 6 of 13 Why does making a vehicle more streamline improved fuel economy? Less energy force and less power are needed to maintain a certain speed. Less fuel is needed so the fuel costs are reduced. 7 of 13 Why are speed cameras sometimes used in pairs? Speed cameras are sometimes used in pairs to determine the speed at two points and calculate the average speed. 8 of 13 When does skidding occur? Skidding happens when the brakes on a vehicle are applied too harshly. 9 of 13 How does skidding affect the stopping distance of a vehicle? Skidding increases the stopping distance. 10 of 13 What is used to prevent skidding? Anti-skid surfaces. 11 of 13 How do anti-skid surfaces reduce skidding? They are rougher than normal road surfaces and increase the amount of friction between the tyres and the road. 12 of 13 Where are anti-skid surfaces usually put? They are used in places where drivers are likely to brake such as near traffic lights and road junctions. 13 of 13
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