Free Fall:
An object dropped from rest...
Free Fall:
An object dropped from rest...
Accelerates downward at 10 m/s22
After 1 second, reaches a speed of
________?
Free Fall:
An object dropped from rest...
Accelerates downward at 10 m/s22
After 1 second, reaches a speed of
10 m/s.
Free Fall:
An object dropped from rest...
Accelerates downward at 10 m/s22
After 1 second, reaches a speed of
10 m/s.
After 2 seconds, reaches a speed of 20 m/s, etc.
v f = at
Free Fall:
An object dropped from rest...
Accelerates downward at 10 m/s22
After 1 second, reaches a distance of
________?
Free Fall:
An object dropped from rest...
Accelerates downward at 10 m/s22
After 1 second, reaches a distance of
5 m.
1
2
d = /2 at
­or­
d = vavgt
Free Fall:
An object dropped from rest...
Accelerates downward at 10 m/s22
After 1 second, reaches a distance of
5 m.
d = 1 /2 at2
­or­
d = vavg t
After 2 seconds, reaches a distance of
________?
Free Fall:
An object dropped from rest...
Accelerates downward at 10 m/s22
After 1 second, reaches a distance of
5 m.
d = 1/ 2 at2
­or­
d = vavgt
After 2 seconds, reaches a distance of
20 m.
I would suggest you take notes like this:
Freefall:
An object dropped from rest.
Accelerates downward at 9.8m/s2 10 m/s
2
Attains a velocity of: v = at
Reaches a distance of:
d = 1/2 at2 ­or­
d = vavgt
Charlie's Angel's Sample Data Answers:
How long did it take?
30 s
___________
What velocity did the helicopter attain?
How far did it fall?
v = (10 m/s2)(30 s)
d = 1/2(10 m/s2)(30 s)2
v = 300 m/s d = 4,500 m = 2.8 miles!!!
(1 km = 0.62 mi)
vavg = (vf ­ vi)/2 vavg =(300 m/s ­ 0 m/s)/2 = 150 m/s
d = (150 m/s)(30 s) = 4,500 m
Free Fall:
An object dropped from rest.
Accelerates downward at 9.8m/s2 ≅ 10 m/s2
Attains a velocity of: v = at
Reaches a distance of: d = 1/2 at2
­or­
d = vavgt
Free Fall:
Grab a timer:
An object dropped from rest.
Accelerates downward at 9.8m/s2 ≅ 10 m/s2
Attains a velocity of: v = at
Reaches a distance of: d = 1/2 at2
Let's Explore
­or­
d = vavgt
Dramatic License
Free Fall:
How long did it take?
An object dropped from rest.
Accelerates downward at 9.8m/s2 ≅ 10 m/s2
Attains a velocity of: ___________
v = at
Reaches a distance of: d = 1/2 at2
­or­
d = vavgt
Free Fall:
How long did it take?
An object dropped from rest.
Accelerates downward at 9.8m/s2 ≅ 10 m/s2
Attains a velocity of: ___________
v = at
Reaches a distance of: d = 1/2 at2
What velocity did the helicopter attain?
­or­
d = vavgt
Free Fall:
How long did it take?
An object dropped from rest.
Accelerates downward at 9.8m/s2 ≅ 10 m/s2
Attains a velocity of: ___________
v = at
Reaches a distance of: d = 1/2 at2
What velocity did the helicopter attain?
­or­
d = vavgt
How far did it fall?
Free Fall:
How long did it take?
An object dropped from rest.
Accelerates downward at 9.8m/s2 ≅ 10 m/s2
Attains a velocity of: ___________
v = at
Reaches a distance of: d = 1/2 at2
What velocity did the helicopter attain?
­or­
d = vavgt
How far did it fall?
Charlie's Angel's Sample Data Answers:
Free Fall:
An object dropped from rest.
Accelerates downward at 9.8m/s2 ≅ 10 m/s2
Attains a velocity of: What velocity did the helicopter attain?
v = 300 m/s 30 s
___________
v = at
Reaches a distance of: d = 1/2 at2
v = (10 m/s2)(30 s)
How long did it take?
­or­
d = vavgt
Free Fall:
An object dropped from rest.
Accelerates downward at 9.8m/s2 ≅ 10 m/s2
Attains a velocity of: What velocity did the helicopter attain?
v = 300 m/s 30 s
___________
v = at
Reaches a distance of: d = 1/2 at2
v = (10 m/s2)(30 s)
How long did it take?
­or­
d = vavgt
How far did it fall?
d = 1/2(10 m/s2)(30 s)2
d = 4,500 m = 2.8 miles!!!
(1 km = 0.62 mi)
Free Fall:
An object dropped from rest.
Accelerates downward at 9.8m/s2 ≅ 10 m/s2
Attains a velocity of: What velocity did the helicopter attain?
v = 300 m/s 30 s
___________
v = at
Reaches a distance of: d = 1/2 at2
v = (10 m/s2)(30 s)
How long did it take?
­or­
d = vavgt
How far did it fall?
vavg = (vf ­ vi)/2 vavg =(300 m/s ­ 0 m/s)/2 = 150 m/s
d = (150 m/s)(30 s) = 4,500 m
Variables Solved/Known
Formulas
d
vavg = Δd/Δt
vi
vf
*
*
vavg = (vi + vf)/2
*
*
vf= vi + at
*
*
FREE FALL
*
a
*
t
*
*
*
a = Δv/Δt
d= vit + ½at2
vavg
*
*
*
*
*
*
*
THIS CAN BE PRINTED OUT FROM THE PHYSICS WEBPAGE!!!
DEMO TIME!!!
But first a little help from a guest lecturer:
真空落下