Velocity - time graphs z A straight line slope shows an
accelerating object!!!! z The steeper the slope the greater the
acceleration!
Slide 4
z If the line slopes downwards it is decelerating! z It has a
deceleration of -2 m/s 2. z We use a minus sign to show that an
object is decelerating! Click for facts! Objects slowing down!
Slide 5
A flat, horizontal line shows an object moving at a constant
speed!!!! This object has a constant speed of 5 m/s OBJECTS MOVING
AT CONSTANT SPEED Click for facts!
Slide 6
QUESTION TIME! z 1. What is the boy racers speed after a) 1s b)
5s c) 9 s z 2. What type of motion does the boy racer have between
a) 0s and 2sb) 2s and 8s c) 8s and 9s z 3. Calculate the
acceleration of the Boy racer between 0s and 2s. z 4. What is the
boys racers deceleration between 8 and 9 seconds? Calculate the
total distance the boy racer travelled!
Slide 7
The area under a velocity-time graph z If you calculate the
area under a velocity time graph it will tell us the distance that
the object has travelled!!!!!! Area = 1/2 x base x height Area =
1/2 x 10 x 20 =100m distance travelled = 100m Click for facts! Area
= base x height Area = 6 x 5 = 30 m distance travelled = 30m
Slide 8
z Write down as much as you can about the motion of the getaway
car in each section of the graph! z How far away has the car
stopped?
