the stuff falls are made of
Besides developing the three laws of
motion, Newton also examined the motion
of the planets and the moon.
He wondered about the force that kept the
Moon in its orbit around the Earth.
Newton was a
Vectors and Scalars
quantities that only contain magnitude and units.
Ex: time, mass, length, temperature
quantities that contain magnitude and direction (as
well as units).
Ex: displacement, velocity, force, acceleration
There are four fundamental
forces in nature:
Strong Nuclear Force
Force that holds protons and neutrons in
the nucleus of the atom
It is an extremely strong force necessary
to overcome the repulsive force between
Only acts at s
What is an electric field?
An electric field is the region of space
around a charge where a positive test
charge experiences a force.
More About Electric Fields
Mathematically, we define the electric field
as the electric force per u
Friction exists between two solid surfaces
because even the smoothest looking
surface is quite rough on a microscopic
As we try to slide an object across another
surface these microscopic bumps impede