forces - speed and velocity + distance time graphs Flashcards
what is distance
a scalar quantity as it has a magnitude but not a direction
what is displacement
a vector quantity as it has Botha magnitude and direction
what is normal waking speed
1.5 m/s
what is normal running speed
3m/s
what is normal cycling speed
6 m/s
what factors effect speed
age/mobility, terrain, distance travelled
what is the normal speed for a car on the road
13 m/s
what is the normal speed for a fast train in the uk
50 m/s
what is the normal speed for a cruising aeroplane
250 m/s
what is the normal speed for sound in the air
330 m/s
when does sound travel faster in air
on warmer days
what is speed of a moving object
rarely constant
what is the velocity of an object
its speed in a given direction
what is velocity
a vector quantity
how do we calculate velocity
the same way we calculate speed with a direction added on at the end e.g. 1.25 m/s south
what happens if an object moves at a constant speed in a circle
its velocity is constantly changing even though its speed is constant
for a distance time graph what does the gradient tell us
the objects speed
how to calculate gradient
distance travelled / time taken
what does a graph tell us if there is an upward facing curve
the object is constantly increasing in speed - accelerating
how would we determine the speed of an object on this type of graph
pick a point, draw a tangent, work out gradient
