Take out your pre lab

1
Welcome!

• Take out your pre lab!
• Sorry no time for stamps today, but please hurry
  up and show me you are ready.

2
Results Section

• During the lab you calculated where the ball
  bearing would land.
• Now you will make a scale drawing of the
  horizontal and vertical components of the
  projectile portion of the balls path!

3
You will draw and label a diagram of this portion
of the balls path.
4
Specifically

• Draw a dashed line representing where the ball
  would go in the absence of gravity and another
  dashed line to show the path if it was just
  dropped.
• Divide the total time in flight by four. Make
  four marks on the vertical and the horizontal
  line to show the distance the ball would be after
  ¼ of the time, ½, ¾, and at the final time.
• For horizontal distance use dst, for vertical
  distance use d1/2gt2

5
Example

• If the total time in flight was 1 second and the
  horizontal speed was 2m/s
• ¼ time ¼.(1s) .25 s
• Horizontal distance dx st
• dx(2m/s)(.25s)
• dx.5m
• Vertical distance d ½ gt2
• d½(10m/s2)(.25s)2
• d0.31m

6
Get Started! Work on this until the end of the
period

• Make a scale drawing of the following
• The distance from the table to the floor
  (vertical distance from step 3).
• The distance from the edge of the table outward
  (horizontal distance from step 5).
• Take the time from step 4 and divide it by 4, use
  these 4 times to calculate what the distance
  would be at ¼ time, ½, ¾, and the final time.
  Plug these times into the following
• Horizontal distance use dst
• Vertical distance use d1/2gt2
• Mark the 4 positions of the ball on the
  horizontal and the vertical lines.
• Connect the positions of the ball as shown in the
  picture and you should have a curved path as
  shown by the purple balls to the right.
• Hint use the scale 10cm1m

d at ½ time
d at ¼ time
d at final time
d at ¾ time
7
Get Started! Work on this until the end of the
period

• Make a scale drawing of the following
• The distance from the table to the floor
  (vertical distance from step 3).
• The distance from the edge of the table outward
  (horizontal distance from step 5).
• Take the time from step 4 and divide it by 4, use
  these 4 times to calculate what the distance
  would be at ¼ time, ½, ¾, and the final time.
  Plug these times into the following
• Horizontal distance use dst
• Vertical distance use d1/2gt2
• Mark the 4 positions of the ball on the
  horizontal and the vertical lines.
• Connect the positions of the ball as shown in the
  picture and you should have a curved path as
  shown by the purple balls to the right.
• Hint use the scale 10cm1m

d at ½ time
d at ¼ time
d at final time
d at ¾ time