1. Universal GravitationUniversal Gravitation
 EverythingEverything
that hasthat has
mass, hasmass, has
gravitygravity

2. Universal GravitationUniversal Gravitation
 When something is very large,When something is very large,
like the Earthlike the Earth
 The gravity is easy to detectThe gravity is easy to detect
 Harder to detect the gravity ofHarder to detect the gravity of
really small objectsreally small objects

3. Universal GravitationUniversal Gravitation
 The force of gravityThe force of gravity
depends on:depends on:
 How massive the objectsHow massive the objects
areare
 How far apart the objectsHow far apart the objects
areare

4. Universal GravitationUniversal Gravitation

5. Universal GravitationUniversal Gravitation
When gravity is the onlyWhen gravity is the only
force acting on an object,force acting on an object,
Its in “free fall”Its in “free fall”

6. Universal GravitationUniversal Gravitation
Free fall near the Earth’sFree fall near the Earth’s
surface is constantsurface is constant
Fall at a rate of 9.8 m/sFall at a rate of 9.8 m/s22
(g)(g)

7. 0 m/s
9.8 m/s
19.6 m/s
29.4 m/s
39.2 m/s
49.0 m/s

8. Universal GravitationUniversal Gravitation
 GravityGravity
affects everyaffects every
object equallyobject equally
regardless ofregardless of
mass in amass in a
vacuumvacuum

9. Universal GravitationUniversal Gravitation
 Weight depends on gravityWeight depends on gravity
 Weight and mass areWeight and mass are
proportional to each other,proportional to each other,
 But theyBut they are notare not the samethe same
thingthing

10. Universal GravitationUniversal Gravitation
The moon’s gravity is 1/6The moon’s gravity is 1/6thth
thatthat
of the Earth’sof the Earth’s
8 lb bowling ball would weigh8 lb bowling ball would weigh
about 1.33 lbs on the moonabout 1.33 lbs on the moon
What about its mass?What about its mass?
Stays the sameStays the same

11. 485 lbs
240 lbs
129 lbs
150 lbs