11/9/09
Oregon State University PH 201, Lecture #19
A 10.0kg child is riding in a car that is traveling at a constant speed
of 20.0 m/s, and the car rounds a curve to the left, a curve whose
radius is 100 m.
Find the force that pushes the child to the right
while the car is rounding the curve.
1.
0.0200 N
2.
2.00 N
3.
4.00 N
4.
40.0 N
5.
None of the above.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
11/9/09
Oregon State University PH 201, Lecture #19
The Universal Law of Gravitation
F
G
=
W
=
ma
=
mg
.
But why is the earth’s surface value of local g
(9.80 m/s
2
) different than local
g
on the moon’s surface?
Where
does a local
g
value come from, anyway?
Isaac Newton looked at data compiled by earlier astronomers and
physicists and made a powerful mathematical connection between
the behavior of ordinary projectiles here on Earth and the motions of
the moon and the planets and sun:
The gravitational force of attraction between any two masses,
m
1
and
m
2
, is given by
F
G
=
Gm
1
m
2
/
r
2
,
where
r
is the distance between the
centers
of the two masses, and
G
is a universal constant (
G
= 6.67 x 10
11
N·m
2
/kg
2
)
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '08
 Staff
 Physics, Force, General Relativity, State University PH, Oregon State University PH

Click to edit the document details