Physics Review

1
Physics Review

• Kinematics Review
• Accelerated Motion

2
Simple Motion

• Objects moving at a constant velocity experience
  no acceleration
• Average speed is total distance / total time
• Remember, velocity is a vector!

10 m/s
-4.0 m/s
3
Accelerated Motion

• Acceleration is the change in velocity per unit
  time
• Acceleration is also a vector!
• See equations on your reference tables

4
Accelerated Motion Practice Problem

• An airplane accelerates down a run-way at 3.20
  m/s2 for 32.8 s until is finally lifts off the
  ground.
• Determine the distance traveled before takeoff.

5
Accelerated Motion Practice Problem

• Upton Chuck is riding the Giant Drop at Great
  America. If Upton free falls for 2.6 seconds,
• what will be his final velocity
• and how far will he fall?

6
Physics Review

• Kinematics Review Continued
• Projectile Motion

7
Projectile Motion

• Remember acceleration is only in y direction!

8
Projectile Motion

• X velocity remains constant
• Y- velocity increases

9
Projectile Motion

• Y velocity decreases as it rises and increases
  as it falls
• Y-velocity is 0 m/s at apex

10
Projectile Motion Practice Problem

• A cannonball is launched horizontally from the
  top of an 80-meter high cliff.
• How much time will it take for the ball to reach
  the ground?

• What will be the cannonballs final speed just
  before striking the ground?

11
Projectile Motion Practice Problem

• A long jumper leaves the ground with an initial
  velocity of 12 m/s at an angle of 28-degrees
  above the horizontal. Determine the
• time of flight,
• the horizontal distance,
• and the peak height of the long-jumper.