1 ) What are the relationships between forces and
motion?
Net force is required to change the motion of an
object, or accelerate the object. Often
times forces are balanced so that net
force = 0, so motion does not change. Work is in the same units as energy, not
force. Work is related to force by W = F*d*cos (theta) where F is the applied
force, d is the distance through which the force has been applied, and theta is
the angle (if any) between the force and the distance. For example if a 100
Newton vertical force is applied to lift an object to a table 5 meters above
the starting point, 500 Newton*meters, or 500 joules, of work have been done
2) What are the variables that affect motion and
force?
When an object is in motion, the ground
exerts a force on the object. This force slows the motion and is called
friction. Objects also have inertia and momentum. Objects at rest have inertia.
Objects in motion have both inertia and momentum.
3) How does Newton’s three laws describe the motion
of a moving object? First law: When
viewed in an inertial reference frame, an object either remains at rest or
continues to move at a constant velocity, unless acted upon by an external
force.[2][3]
Second law: F = ma. The vector sum of the forces F
on an object is equal to the mass m of that object multiplied by the
acceleration vector a of the object.
Third law: When one body exerts a force on a second
body, the second body simultaneously exerts a force equal in magnitude and
opposite in direction on the first body.
All of these laws together make for the motion of a moving object, with
different forces and such impacting the motion dramatically.
4) How does gravity impact objects? Gravity impacts objects very dramatically to
the pulling force from the sun and other objects floating about in space. It will pull down the object and take it out
of motion and then going on to at another force, possibly friction when it hits
the ground.
