Things That Go

1
Things That Go Fast

• Straight Line Motion

2
Revision

• Equations of motion

3
Symbols

• s displacement (m)
• t Time (sec)
• u initial Velocity (ms-1)
• v final Velocity (ms-1)
• a acceleration (ms-2)

4
Question
A truck is Cruising along at 27ms-1. A vehicle
pulls out in front of him and he hits the brakes.
The truck decelerates at a constant -8.5ms-2 for
2.3 seconds. What is the new velocity of the
truck?
5
Drag Racing
6
Drag Racing Question
Two drag cars are competing in a quarter mile
race (400m). Lightning Rod accelerates constantly
at 17.8ms-2. Thunder bolt finishes the race with
a velocity of 104ms-1.
Which car wins the race, assuming both cars start
at the same time?
7
Bugatti Veyron Anyone???
8
Bugattis Velocity

• Apparently The Bugatti Veyron can accelerate from
  150kmh-1 to 280kmh-1 in just 6 seconds.
• What is the rate of acceleration?
• How long would it take to accelerate to 400kmh-1
  at the same rate?
• What stopping distance is required if the Bugatti
  decelerates at a rate of -16ms-2?

9
Rockets
10
Rocket Question

• A rocket is launched vertically from the edge of
  a cliff (600m above sea level). The acceleration
  upward is constant at 37ms-1 for 29 seconds.
• How high does the rocket get above sea level?
• How long does it take for the rocket to fall to
  the ocean? (advanced question)

11
Question time

• Work on the question sheet from last lesson.