Download Forces and Motion Simulation Summary Notes

Forces and Motion Simulation
Summary Notes
Forces
Forces

Forces have Magnitude
and Direction.

We represent these in
diagrams with arrows.

Larger the force the
bigger the arrow.
50N in Each direction
Forces and Motion
50 N in each Direction

When we look at a
diagram we can figure
out the sum of forces.

Sum of forces = Force
applied- friction force.

In other words = Larger
force – smaller force.
Forces
 If
50N in each direction
the forces are
equal then the
sum of forces will
be 0. The object
won’t move.
 This
is a equal
force
Forces



150N
50N

Sum of forces= Force
applied – friction force
What is friction?
Friction- is
the force resisting the
relative motion of solid
surfaces, fluid layers, and
material elements sliding
against each other
Which one is resisting
movement?
Forces


150N
50N


The force to the right is
bigger then the force to
the left.
The object will move to
the left. The right force is
resisting movement.
Sum of forces- 150N 50N=100N to the left.
This is a Unequal force
Motion
Motion

Important to consider!!

In this simulation
FRICTION was NOT
taken into consideration.

No friction was acting on
the wheels of the skate
board
Motion

The heavier the mass of
the object the longer it
took for the object to reach
maximum speed.

Mass- a property of
a physical body which
determines the strength of
its mutual gravitational
attraction to other bodies
and its resistance to
being accelerated by a force.
Friction
Friction

is the force resisting the relative motion of
solid surfaces, fluid layers, and material
elements sliding against each other.

There are four kinds of friction we are going
to talk about. Static Friction, Sliding Friction,
Rolling Friction, and Fluid Friction.
Static Friction

Static Friction – occurs
when a body is forced to
move along a surface but
movement does not start.

The magnitude of the
friction force is equal or
greater than the applied
force. No movement
occurs.
Sliding (kinetic) Friction
This occurs when the
applied force is
greater then the
frictional force.
 This causes the
object to move along
the surface.

Rolling Friction.

This is what was being
ignored in the motion
simulation.

Rolling friction is a force that
slows down the motion of
a rolling object.

Combination of frictional
forces at the point of
contact with the wheel and
the ground/surface.
Fluid friction

Occurs when a body
moves in a fluid or air and
there exist a resistive
force that slows down the
motion.

Freely falling skydiver feels
a drag force due to air
which acts in the upward
direction (opposite) of the
skydivers motion.
Acceleration
Acceleration

Acceleration - defined as
the rate at which an
object changes its velocity
(speed+direction). An
object is accelerating if it
is changing its velocity.

Velocity- is simply speed+
direction.
Acceleration

Math makes this easier to
understand

Acceleration
=
Force (N) / Mass(kg)

Acceleration has the units
of meters per second
squared (m/s2 )
Newton's Laws of Motion

1st Law- Every object
in a state of uniform
motion tends to
remain in that state
of motion unless an
external force is
applied to it.
Newton's Laws

2nd -The
relationship
between an
object's mass m,
its acceleration a,
and the applied
force F is F = ma.
Acceleration and
force are vectors
Newton's 3rd law

For every action there
is an equal and
opposite reaction.