7.1- SPEED AND VELOCITY Flashcards
What is displacement?
distance in given direction
What is speed?
change of distance per unit time
What is velocity?
change of displacement per unit time
speed in given time
What types of quantities are speed and distance?
scalar quantities
What types of quantities are velocity and displacement?
vector quantities
What does an object moving at constant speed do?
travel equal distances in equal time
How to calculate speed of object moving at constant speed on a circle?
v = 2πr
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T
How many types of speed cameras are there?
2
What are the two types of speed cameras?
one type measures speed of vehicle as it passes camera
other type linked to second speed camera + computer, which works out average speed of vehicle between two cameras
What is the distance against time graph like for an object moving at constant speed for ?
straight line with a constant gradient
What changes on a distance time graph for an object moving at changing speed?
gradient of line changes
How can the gradient of the line for changing speed be found?
drawing a tangent then measuring gradient
What does an object at constant velocity do?
moves at same speed without changing its direction of motion
If an object changes its direction of motion or speed/ both, what happens to the velocity?
velocity changes
Example when object changes velocity but has constant speed?
object moving on a circular path
