Transcript Kinematics - Angelfire

Kinematics
Jose
Dwayne
Luke
Motion
Some of the
equations that we
use are:
v=d total/ t total
Vave= vo +vf / 2
a= vf- vo / tf –to
d=vot+1/2at2
Vf=vo + at
Vf2= vo2 +2ad
v represents velocity
which is motion.
Measured in m/s
a represents
acceleration which is a
positive change.
Measured in m/s2
vf is final velocity.
vave is average velocity.
vo is original velocity.
t represents time.
Measured in seconds
d represents distance.
Measured in meters.
Motion
 To help understand some more of motion and
force you need to know about Newton’s laws:
 1st law is the Law of Inertia states that a body at
rest or in motion will stay at rest or in motion until
acted upon by an outside force.
 2nd law states F=ma
 3rd law states for every action there is an equal but
opposite reaction.
 Also inertia is the reluctance of any body to
change its state of motion.
Acceleration
•
•
•
•
•
Acceleration is a state of motion
Acceleration is a change in motion
V=_____ m/s
A= _____m/s2
Displacement is the distance from the
starting point to the end point.
• Acceleration is fun. You move, which is
motion.
Motion and Examples
• A car going 0mph to 50mph in 3
seconds is an example of
acceleration.
• Here is a problem to help you learn
motion: Find the velocity of a car
going 700 meters in 2 seconds…
• You use the equation v= d/t, 700/2
which the car has a velocity of 350
meters/second (m/s)
Motion in Motion
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Momentum


Momentum is inertia in motion.
The equation for momentum is P=mv

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
P is momentum which is measured in kg m/s,
m is mass, v is velocity.
An impulse is the change in momentum.
Ft is impulse, momentum change is m(Δ
v), Δ is change in, the equation for
impulse is Ft= m (Δv)
May the FORCE be with you….
• Force is represented
by F and is measured
in Newtons.
• m is mass and is
measured in kgs.
• G is gravity and it is
9.8 or 10 depending
on what you want to
use.
• F= ma
• Fw= mg
• Ff= µFN
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Force Diagrams
 First off a force diagram
is a drawing showing all
of the forces acting on
an object.
 Normal forces are
always directed
perpendicular to the
surface.
 Gravitational forces are
always directed down
towards the surface of
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the Earth.
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