Download Force/Newton`s First Law Notes

Force/Newton’s First Law
Notes
Force/Newton’s First Law Notes
Force is any interaction between any two
objects or an object and its environment.
Two types of forces:
Contact forces are usually pushes or pulls
that result from direct contact between
objects.
Field forces do not result from direct
contact but can act over a great distance.
Gravity, electric, and magnetic forces are
all examples of field forces.
Force/Newton’s First Law Notes
Forces are vector quantities which
means that they have both a
magnitude and a direction.
The standard unit for force is the
Newton (N), which is equal to
Kilogram x Meters/seconds/seconds
(kg m/s )
Force/Newton’s First Law Notes
Force diagrams are visual
representations of objects
with force vectors drawn
emanating from the center of
the object and pointing in the
direction of the force.
Free body diagrams are force
diagrams of only one object.
Look at example on pg. 127-128
Force/Newton’s First Law Notes
Newton's first law (Law of inertia)
states that an object can't change
either its direction or speed of
motion (accelerate) unless it
interacts with another object (force).
Force/Newton’s First Law Notes
Even if a force does act on an object,
the object still might not accelerate if
that force is balanced (canceled) by
another force. An unbalanced force
is one which is not canceled by
another, and it will always cause
acceleration.
A net force is the vector sum of all
forces acting upon an object.
Force/Newton’s First Law Notes
Equilibrium is a situation in which all
forces balance out and the net force
is zero.
Mass is measured in kilograms and is
a measure of inertia. It is the
property of all matter which causes it
to resist any change in its direction,
or speed of motion.