motion of a body.
Let’s See Some Examples here
placed into two broad categories: contact forces, and forces resulting from
and air resistance forces….
International System of Units (SI).
defined as the amount of force needed to accede of mass at a rate of 1 meter per second squared (m/s^2).
force will accelerate at a rate of 1 m/s^2.)
pound of force will accelerate at 1 ft/s^2, and a pound mass is the amount of
mass that 1 LB of force will accelerate at 32 feet/s^2.
Description of a Force
both magnitude and direction. To fully describe the force acting upon an
object, you must describe both its magnitude and direction.
acting on an object. 10 Newtons, downwards is a complete description of the
force acting upon an object.
Now we must learn What the
difference between vector and scalar quantities is?
direction, a scalar quantity can be described using only 1 quantity, magnitude.
velocity, acceleration etc.
time, energy and volume since they only represent magnitude and no direction.
Mass and Weight?
scales commonly used in the classroom –a spring scale (left) and a simple
balance beam scale on the right.
100g with an unknown mass attached at the bottom. To balance the scale on the
right a 100g mass was also needed.
what would the the spring scale read? How much mass would be needed to balance
the 100g mass on the balance beam?
the acceleration (a) of an object is directly proportional to the force (F)
applied, and inversely proportional the object’s mass (m).
you apply to an object, the greater the acceleration. And, the more mass the
object has, the lower the acceleration.
Newton’s Second Law can be
written in equation form:
F=mg where g is the acceleration due to gravity. The force of gravity is what
causes free falling objects to accelerate. These objects all accelerate at the
same rate of 9.8 meters/sec^2.
What is Friction?
opposes the relative motion or tendency to such motion of two bodies in
contact. If we try to push a block of wood across a table, there are two
opposing forces that act: the force associated with the push, and a force that
is associated with the friction which acts in the opposite direction. As
frictional forces are decreased (for example, by placing oil on the table) the
object moves further and further before stopping. This demonstrates Galileo’s
law of inertia too.