Unit 2- 1 3.0 / 5 based on 1 rating ? PhysicsGCSEAQA Created by: Amy ClynesCreated on: 16-04-13 12:14 How do you calculate the speed of an object? speed (metres per sec)= distance travelled in m / time take in sec 1 of 16 What is the unit of speed? metres per second 2 of 16 How can you tell if an object is stationary? horizontal/ flat line 3 of 16 How can you tell if an object is moving at a constant speed? diagonal line that slopes upwards 4 of 16 What are tachographs? long distance vehicles are fitted with them to mesure the distance and time taken to check drivers dont drive for too long 5 of 16 What does a distance time graph show? speed 6 of 16 What is velocity? speed in a given direction 7 of 16 What is acceleration and how is it mesured? A change of velocity per second, it is mesured in metres per second squared 8 of 16 What does it mean if an object changes velocity? it is accelerating 9 of 16 What is the formula for acceleration? acceleration (metres per sec squared)= change in velocity metres per sec / time taken for change in secs 10 of 16 What is deceleration? change of velocity per second when an object slows down 11 of 16 What does it mean if a velocity time-graph is a horizontal line (flat line)? There is no acceleration or deceleration 12 of 16 What does braking do to the velocity? reduces it 13 of 16 What does the gradient of a distance- time graph show? speed 14 of 16 What does the gradient of a velocity-time graph show? acceleration 15 of 16 What does the area under the line on a velocity- time graph show? distance 16 of 16
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