Frames of Reference in Physics
Frames of
Reference
IFORs and NIFORs
What do you think?
https://www.youtube.com/watch?v=b14l3-A8iUQ
Law of Inertia
An object in motion wants to
stay in motion, an object at
rest wants to stay at rest
An unbalanced force can
change the state of motion of
an object
IFOR
Inertial Frame of Reference
A frame in which the law of
inertia and Newton’s laws are
valid
Any frame of reference
moving at constant velocity or
at rest
NIFOR
Non-Inertial Frame of
Reference
Law of inertia and
Newton’s laws are violated
FOR is accelerating
Fictitious Force
When in a NIFOR, we
create a fictitious (made-up)
force to explain why an
object would change it’s
motion without a force
actually applied
Accelerometer in NIFOR
In a NIFOR, an object at rest will read a
non-zero acceleration
Think of an accelerometer in a car
accelerating from a red light. Where can
we see a fictitious force?
NIFOR Example
You are standing on a bus as it is travelling
along a street at a constant velocity (IFOR).
The bus slams on it’s brakes (NIFOR). The
person beside you, from your perspective
moves towards the front of the bus (as if a
force is applied) but there is no force applied
◦
The object changes it’s motion without a force
applied, therefore violating law of inertia (N 1
st
)
Sometimes it’s easier to deal with a
fictitious force than to look at things from
an Inertial Frame of Reference
FBD in a NIFOR
1) Draw a FBD of a ball sitting on the floor
of the bus (FOR) as the bus accelerates
FBD in a NIFOR
2) Draw a FBD of a ball hanging from your
rear view mirror as you move around a
corner
Ch.2 Review: Try Self Quiz p115 Q1 -21
Pg 117 Q8,10,15,16,17,25,28,29
Explore the concept of Frames of Reference (IFORs and NIFORs) in physics, including laws of motion, Inertial and Non-Inertial Frames, Fictitious Forces, and examples like the accelerometer in NIFOR. Learn how these concepts help explain motion and forces in different reference frames.
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Presentation Transcript
Frames of Reference IFORs and NIFORs
What do you think? https://www.youtube.com/watch?v=b14l3-A8iUQ
Law of Inertia An object in motion wants to stay in motion, an object at rest wants to stay at rest An unbalanced force can change the state of motion of an object
IFOR Inertial Frame of Reference A frame in which the law of inertia and Newton s laws are valid Any frame of reference moving at constant velocity or at rest
NIFOR Non-Inertial Frame of Reference Law of inertia and Newton s laws are violated FOR is accelerating
Fictitious Force When in a NIFOR, we create a fictitious (made-up) force to explain why an object would change it s motion without a force actually applied
Accelerometer in NIFOR In a NIFOR, an object at rest will read a non-zero acceleration Think of an accelerometer in a car accelerating from a red light. Where can we see a fictitious force?
NIFOR Example You are standing on a bus as it is travelling along a street at a constant velocity (IFOR). The bus slams on it s brakes (NIFOR). The person beside you, from your perspective moves towards the front of the bus (as if a force is applied) but there is no force applied The object changes it s motion without a force applied, therefore violating law of inertia (N 1st)
Sometimes its easier to deal with a fictitious force than to look at things from an Inertial Frame of Reference
FBD in a NIFOR 1) Draw a FBD of a ball sitting on the floor of the bus (FOR) as the bus accelerates
FBD in a NIFOR 2) Draw a FBD of a ball hanging from your rear view mirror as you move around a corner
Ch.2 Review: Try Self Quiz p115 Q1 -21 Pg 117 Q8,10,15,16,17,25,28,29
