speed Flashcards
(29 cards)
what is distance
how far an object moves
what type of quantity is distance
scalar
what is displacement
the distance and direction of a straight line to an objects starting point to its finish point
what is velocity
an objects speed in any given direction
what is the equation linking distance speed and time
distance (m)= speed (m/s)x time(s)
what is the average walking speed
1.5 m/s
what is the average running speed
3 m/s
what is the average cycling speed
6 m/s
what happens if an objects velocity changes
its direction changes even if its speed is constant
what is acceleration
the change in an objects velocity per second
what type of quantity is acceleration
vector
what type of quantity is displacement §
vector
what type of quantity is velocity
vector
when is an object accelerating
when its speed or direction or both are changing
what is deceleration
a negative acceleration , when an object is slowing down
what is uniform acceleration
when the acceleration of an object is constant
what happens when a object moves through a fluid
drag forces act on it
what direction do drag forces act in regards to an objects movement
drag forces act in the opposite direction to an objects movement
when do drag forces increase
drag forces increase with speed - the greater the speed the greater the frictional force
what do drag forces depend on
the shape and size of the object
what does streamlining do
reduces the drag experienced by an object
what is air resistance
frictional drag force in the air
what is terminal velocity
the constant velocity a falling object reaches when the frictional force acting on it is equal to its weight
when an object falls through a fluid which forces are acting on it
its weight due to gravity and the drag force
