Forces
A force is simply any _____ or ______.
push, pull
Einstein's theory of gravity is based on the curvature of ________ around a massive object.
spacetime
Name the three types of fields we study.
Gravitational, Electric, and Magnetic
What causes a gravitational field?
anything with mass (matter)
Magnetic ______ always come in ______.
poles, pairs
The fundamental forces are also called fundamental _________.
Nothing ever really touches anything else. The force of _______ ________ keeps them apart.
electric repulsion
We represent fields by drawing ______ _____ around an object that is producing a field.
field lines
What is affected by a gravitational field?
anything with mass (matter) and electromagnetic radiation
According to ________ ______, a magnetic field is produced around a current-carrying wire.
Ampere's Law
How many of the fundamental forces are noticeable to us in ordinary daily life?
The ______ ______ ______ is the agent behind beta decay.
weak nuclear force
The direction that field lines point indicates the direction of the _____ that would be present on an object placed there.
force
falling
All magnetic field lines emerge from the ______ _____ of the magnet and end at the ______ _____ of the magnet.
north end, south end
What are the fundamental forces?
Gravitational Force
Electromagnetic Force
Strong Nuclear Force
Weak Nuclear Force
With the term field, we are talking about a ________ description of the way one object exerts a force on another.
geometrical
strength
an inverse square law
When a wire is wrapped in a coil and a current is sent through it a ________ is created.
electromagnet
List the fundamental forces from strongest to weakest.
Strong Nuclear
Electromagnetic
Weak Nuclear
Gravity
The strength of the electromagnetic force is ______ times that of the gravitational force.
1036
What causes electric fields?
any charged object
toward the center of the object causing the field
A moving electric charge is always pulled _______ by a magnetic field.
sideways