The document discusses free fall and Galileo's experiments proving that all objects fall at the same rate regardless of their mass if air resistance is neglected. It notes that Galileo timed metal balls rolling down an inclined plane with a water clock to measure their speed of falling. The key equations for free fall acceleration due to gravity (g = -9.8 m/s^2) and relationships between displacement, time, initial velocity, and final velocity are also presented.

2. Which is safer to
catch, a stone
dropped from the
tip of a two-
meter pole or
from the 5th floor
of a building?

6.  In the late 16th century, it was
generally believed that
HEAVIER objects FALL
FASTER than lighter ones.

7.  He hypothesized that two objects
would fall at THE SAME RATE
REGARDLESS OF THEIR MASS
 Experiment:
 He measured the speed of falling
objects by allowing metal balls to roll
down an inclined plane and timing them
with a water clock.

8. GALILEO
vs
ARISTOTLE

11. Feather or hammer?

12. What is FREE FALL?
Air resistance is
neglected and the
acceleration is
constant

13. The acceleration of a
freely falling body is
called acceleration due
to gravity
g = -9.8 m/s2

14.  The acceleration
due to gravity is
downward and
directed toward the
center of Earth,
giving it its negative
sign.

17. 𝑑𝑦 = 𝑣𝑖𝑡 +
1
2
𝑔𝑡2
𝑑𝑦 =
𝑣𝑓
2
− 𝑣𝑖
2
2𝑔
𝑔 =
𝑣𝑓− 𝑣𝑖
𝑡

19. OTime symmetry
Othe time required for the
object to reach maximum
height equals the time for
it to return to its starting
point

20. OSpeed symmetry
OShows that at any displacement
above the point of release, the
speed of the body during the
upward trip equals the speed
during the downward trip.

21. FREE FALL