describing motion Flashcards
what is velocity?
the speed of an object in a specific direction.
on a distance/time graph, what value does the gradient of the line represent?
the speed
on a displacement/time graph, what value does the gradient of the line represent?
The velocity
state the equation for the average acceleration of an object.
acceleration = change in velocity / time taken
give an equation relating final velocity with initial velocity, displacement and acceleration.
v2 = u2 + 2ax
how can the distance travelled by an object be calculated from a velocity-time graph?
it is equal to the area under the graph.
what must be done to calculate speed at a given time from a distance-time graph for an accelerating object?
draw a tangent to the curve at the required time
calculate the gradient of the tangent
in a velocity/time graph what does the gradient of the graph represent?
the acceleration
state a typical value for the speed of sound
330 m/s
what is a typical value for human walking speed?
1.5 m/s
what is a typical value for human running speed?
3 m/s
what is a typical value for human cycling speed?
6 m/s
give an approximate value for the acceleration of an object in free fall under gravity near the Earth’s surface
10 m/s2
what is average speed?
the distance that you’re covering at a specific speed
what is the typical speed for cycle get
5.5 m/s
