Centrifugal force

1
Centrifugal force

• It does not exist!

2
Centrifugal Force

• An object traveling in a circle behaves as if it
  is experiencing an outward force.

3
Centrifugal Force

• This force depends on the mass of the object, the
  speed of rotation, and the distance from the
  center. The more massive, the greater the speed
  or the greater the distance the object, the
  greater the force from the center, the greater
  the force.

4
Centrifugal Force

• However, centrifugal force does not actually
  exist.

5
The Real Force

• According to Newton's first law of motion, a
  moving body travels along a straight path with
  constant speed (i.e., has constant velocity)
  unless it is acted on by an outside force. For
  circular motion to occur there must be a constant
  force acting on a body, pushing it toward the
  center of the circular path.

6
Centripetal Force

• This force is the centripetal (center-seeking)
  force.

7
Centripetal Force

• A constant force acting on a body, pushing it
  toward the center of the circular path.

8
Centripetal Force

• For a planet orbiting the sun, the force is
  gravitational for an object twirled on a string,
  the force is mechanical for an electron orbiting
  an atom, it is electrical

9
Centripetal Force

• The magnitude F of the centripetal force is equal
  to the mass m of the body times its velocity
  squared v 2 divided by the radius r of its path.
• Fmv2/r
• F force, m mass, v velocity and r radius
  of travel

10
Gyroscopes

• A device for measuring or maintaining
  orientation, based on the principle of
  conservation of momentum.

11
Gyroscopes

• The spinning device tends to resist changes to
  its orientation due to the angular momentum of
  the wheel. In physics this phenomenon is also
  known as gyroscopic inertia or rigidity in space.

12
Gyroscopes

• A gyroscope exhibits a number of behaviors
  including precession.
• Precession is a change in the direction of the
  axis of a rotating object.

13
Gyroscopes