Chapter 9 Flashcards
what does the gradient on a distance-time graph represent?
speed
equation for speed
distance // time
unit of speed
m/s
what does a flat line on a d-t graph show?
the object stops moving
what does a straight line on a d-t graph show?
its travelling at a steady speed
what does a curved line on a d-t graph show?
acceleration or deceleration
what is velocity?
speed in a given direction
what is displacement?
the distance travelled in a given direction
what is the acceleration of an object?
its change in velocity per second
equation for acceleration
change in velocity / time taken for the change
unit for acceleration
m/s^2
what is deceleration?
when an object slows down
what does the gradient on a velocity-time graph represent?
acceleration
what do flat sections on an v-t graph show?
the object was travelling at a steady speed
what does a steeper gradient show?
a greater acceleration or speed
what does a curve on a v-t graph show?
changing acceleration
how to find the acceleration at a curved point on a graph?
use the tangent
in a v-t graph, what does the area under the graph show you?
the distance travelled across that period of time
what does braking do?
reduces the velocity of a vehicle
how to show braking on a graph?
deceleration ()
how can you measure velocity change?
attach a motion sensor to a computer
how to find the gradient of a graph?
turn a section of the line into a triangle and do the difference in y divided by the difference in x
how to calculate the distance travelled if the graph is complex?
break it down into smaller, more manageable shapes
how to find the acceleration/speed of a curved graph at any point in time?
draw tangent at where the time meets the curve
turn this into a triangle
calculate gradient
what is a tangent?
a straight line that touches the curve at a specific point without cutting through it
