Isci:chapter 5 (Gravity)

Front 1

1. The Legend of the Falling Apple

Back 1

Isaac Newton discovered both the moon and the falling apple are being pulled by the earth's gravitational pull

Front 2

The Fact of the Falling Moon States?
It Falls?
Moon maintains what kind of velocity? definition?

Back 2

States that: The Moon falls around the Earth. It falls beneath the straight line it
would follow if no force acted on it.
The Moon maintains a tangential velocity.
- ensures a nearly circular motion
around and around the Earth rather than into
it.

Front 3

Newton's Law of Universal Gravitation

Back 3

-Everyone attracts another with some kind of force.
-Every mass pulls on every other mass.
-Newton Discoverd that Gravity is Univesal

F = G
m1 × m2
/
d^2

Front 4

Gravity & Distance: The Inverse-Square Law

***

Back 4

Intensity ≈ 1
distance2

-The greater the distance from the earth, the less its gravity acts on it.

**No matter how great the distance, gravity
approaches, but never reaches, zero.

Front 5

THe Universal Gravitational Constant, G

Back 5

links forces to masses

Front 6

Weight
& Weightlessness

Back 6

-Weight
is the force exerted against a supporting floor or
weighing scale.

-Weightlessness
is a condition wherein a support force is
lacking—free fall, for example.

Front 7

Center of Gravity

Back 7

is the point at object’s average
position of weight.

Front 8

Gravity Can Be a Centripetal Force

Back 8

is any force that causes an object to follow a
circular path.

Front 9

Projectile Motion is?
Path Makes What?
Curves as a result of what two motions?

Back 9

any object that moves through the air or
through space under the influence of gravity.

-path makes a porabola.

A projectile curves as a
result of two motions:
• constant motion
horizontally
• accelerated motion
vertically

Front 10

Projectile Altitude & Range

Back 10

For equal launching speeds, the same range is
obtained from two different projection angles—a
pair that add up to 90°.

Front 11

The Effect of Air Drag on Projectiles
w/ air resistance?
w/out air resistance?

Back 11

• With air resistance,
both range and altitude are decreased.
• Without air resistance,
the speed lost going up is the same as the
speed gained while coming down.

Front 12

Fast-Moving Projectiles-Satellites
what is it?
How to become?

Back 12

is any projectile moving fast enough to fall continually around the Earth.

To become an Earth satellite, the projectile’s
horizontal velocity must be great enough for its
trajectory to match Earth’s curvature.

Front 13

Elliptical Orbits
Ellipse?

Back 13

The oval path followed by a satellite. The closed
path taken by a point that moves in such a way
that the sum of its distances from two fixed
points (called foci) is constant.