Forces, braking and terminal velocity 0.0 / 5 ? PhysicsForces and MotionIGCSEAQA Created by: Lotto65Created on: 23-12-15 14:05 What is the resultant force if an object is travelling at a steady speed? Zero 1 of 22 Are driving forces equal to resistive forces? Yes- EQUAL AND OPPOSITE 2 of 22 Give examples of what causes resistive forces? Air resistance or friction between moving components 3 of 22 The faster the speed... (deceleration) The bigger the deceleration needed to stop the vehicle 4 of 22 The faster the speed...(braking) The larger the braking force to stop the vehicle 5 of 22 What is the general equation explanation for stopping distance? Thinking distance+ braking distance 6 of 22 What increases thinking distance? Tiredness; Under influence of alcohol or drugs 7 of 22 What increases braking distance? Poor road quality; Bad weather conditions; Bad car conditions (worn tyres or brakes) 8 of 22 Why does tiredness increase thinking distance? Increased reaction time 9 of 22 What is the equation for thinking distance? Speed x Reaction time 10 of 22 What is the resultant force on a falling object? Gravity 11 of 22 What is acceleration due to gravity as a figure? 10m/s squared 12 of 22 What is the equation symbol for acceleration due to gravity? g 13 of 22 What do we call the force of gravity on an object? Weight 14 of 22 What are the two meanings of 'g' in equations? Gravitational field strength; acceleration due to gravity 15 of 22 What can be gravitation field strength's unit? N/Kg 16 of 22 What force is exerted on an object when it falls through a fluid? Drag 17 of 22 The faster an object falls...(drag) The greater the drag force 18 of 22 What happens when there is drag? The resultant force decreases and acceleration decreases 19 of 22 What happens after this? Drag force equals weight of object so it no longer accelerates and goes at a constant velocity instead 20 of 22 At this point what value is the resultant force? Zero 21 of 22 What is terminal velocity? The velocity reached when the drag force on an object is equal and opposite to the force driving the object 22 of 22
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