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2 votes
1 answer
85 views

How does Newton's First Law show the existence of inertial reference frames? [duplicate]

Newton merely stated the law of inertia as: An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced ...
Haria Kumar's user avatar
0 votes
2 answers
109 views

Are there two competing definitions of "inertia"?

The term inertia is often introduced by stating Newton's first law: An object stays at rest or moves with $\vec{v}=const.$, if the resultant force is zero. This feature of masses is called "...
lomofreak's user avatar
25 votes
7 answers
3k views

How many types of inertia are there?

I was looking for types of inertia, but I am confused. My book says there are three types of inertia, namely inertia of rest, inertia of motion, and inertia of direction. But when I searched for these ...
Shinnaaan's user avatar
  • 1,357
1 vote
3 answers
315 views

Why don't we use momentum to quantify inertia?

My understanding of Newton's 1st and 2nd laws have led me to believe that inertia and momentum are the same. 1st law: An external force is required to overcome an object's inertia 2nd law: Force is ...
Archit Sharma's user avatar
-2 votes
1 answer
92 views

Mechanically speaking, how does inertia work?

(I haven't worked with this physics in decades, my terminology might be off) First year varsity physics: Inertia is a property of mass. It is the amount of force to start an object moving (or change a ...
TungstenX's user avatar
1 vote
1 answer
138 views

The definition of inertia in Mach's principle

Can anyone please explain me Mach's principle, i.e the definition of inertia he has given? I am really not getting what spin and universe have to do with inertia because what we are taught in our ...
Nandani Kumari's user avatar
1 vote
0 answers
47 views

Equivalence among three kinds of mass

If there are three kinds of mass (1) resistance (classical inertial mass, rest mass) (2) sensitivity to gravity (weight) (3) creation of gravity, the Eotvos experiment shows the proportionality ...
user avatar
1 vote
2 answers
370 views

Why is Newton's First Law not considered a vacuous statement? [duplicate]

How did Newton come to postulate the law of inertia when every inertial body that he was considering was (by his own other hypotheses) being acted on by the force of universal gravitation. In other ...
AdamFi's user avatar
  • 11
24 votes
4 answers
2k views

Definition of mass

In high school physics, I was taught that mass was just how much "stuff" or matter there is in an object. However, now that I am learning physics again in college, I am taught that mass of an object (...
baker's user avatar
  • 517
0 votes
1 answer
318 views

How may the situation, when there is no inertia? [duplicate]

I want to know clearly the real concept of inertia.I have seen lot of definitions regarding inertia.But I could not exactly find real meaning of inertia.
user avatar
4 votes
1 answer
5k views

What is the meaning of "moment"?

What is the meaning of moment? I'm little confused about the word as there are some terms like moment of momentum, moment of mass, moment of force, etc. I want to know what exactly is meant by the ...
Neyamul's user avatar
  • 63
30 votes
9 answers
100k views

Inertia Vs Momentum

At my recent lesson on kinematics, my teacher taught about inertia and momentum. This is what she said. Inertia: a characteristic of an object that resists changes to its state of motion. Momentum: ...
Simon-Nail-It's user avatar
6 votes
3 answers
4k views

Newton's first law: is his concept of (force of ) inertia still useful and used?

The force of inertia is the property common to all bodies that remain in their state, either at rest or in motion, unless some external cause is introduced to make them alter this state. That is ...
bobie's user avatar
  • 5,854