Electromagnetic Force -

1
Nuclear Forces Forces that exist within the
nucleus of an atom Strong Nuclear- a powerful
force of attraction that acts only on the
neutrons and protons in the nucleus (holds them
together) occurs over a very short distance
strongest force example Force that holds protons
and neutron together in the nucleus Weak
Nuclear- a powerful force of attraction within
the nucleus of an atom
weaker than strong nuclear
force affects all particles in atoms
shorter range of
effect than strong
nuclear force
example force that also holds
subatomic particles
Electromagnetic Force - Associated with charged
particles only forces that both attract and
repel Electric Force electromagnetic force that
acts between charged objects or
particles example Forces between protons and
electrons Static cling, polyester shirts, latex
balloons Magnetic Force EM force that acts on
certain metals, poles of magnets, and on moving
charges example Magnets
Universal Forces (12.4)
Centripetal Force a center-directed force that
continuously changes the direction of an object
to make it move in a circular path Gravity acts
as a centripetal force in the universe.
Gravitational Force attractive force that
acts between any two masses weakest universal
forces acts over the longest distance Newtons
Law of Gravitation Every object in the universe
attracts every other object
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Why doesnt a satellite in a high orbit need to
fire rocket engines to remain in orbit? (pg
382) The satellite needs only the centripetal
force provided by Earths gravity and its own
inertia to maintain its orbit.
How is the moon kept in orbit around the Earth?
(pg 381) Earths gravitational force keeps the
moon in a nearly circular path (orbit) around
Earth.
Universal Forces (12.4)
How has Issac Newtons laws of
motion universal gravitation led to
the development of modern technology? (pg 382)
It has allowed humans to transmit via TV signals
live events around the world (using satellites)
List several uses of satellites (pg 382)
Monitor Earths weather Create detailed radar
maps of Earths surface Use telescopes to gaze
deep into space Study Earths climate
Receive/Transmit Radio and Microwave signals