# Am I right to conclude this about mass?

• dE_logics
In summary, when a force is applied on a freely moving mass, it opposes the motion and there must be a force to oppose it. This is known as Newton's First Law. Additionally, if a mass is set in motion without breaking, the normal reaction given by the mass will be equal to the force being applied on it. This follows Newton's Third Law. It is not accurate to say a force is applied on another force, but rather a force is applied to the object causing that force. And finally, a force without motion does not do any work.

#### dE_logics

When a force applies on a freely moving mass, it opposes the motion, to oppose the motion there should be a force. So we can conclude that if a mass is made to move, it applies a force on the force that applies on it
.
If any moving mass is set to motion, without collapsing itself (or breaking), it can be said that the normal reaction given by the mass is equal to the force that applies on it.

Yes, exactly Newton's Third Law.

dE_logics said:
When a force applies on a freely moving mass, it opposes the motion, to oppose the motion there should be a force.
You are saying a force on a mass exists if and only if there is an acceleration (in your terms, if "it opposes the motion"). This is Newton's First Law.

dE_logics said:
So we can conclude that if a mass is made to move, it applies a force on the force that applies on it.
It doesn't make sense to "apply a force on a force". Instead, we should say "apply a force to an object causing that force". As Pengwuino said, this is Newton's third law. I wouldn't say we can "conclude" this is true just because what you said before was true, though.

Ok...thanks a lot people!

Force without motion does no work. A mass M on a table has a downward force Mg, and the table has an equal opposing upward force -Mg, so the two forces balance , and no work is done.

## 1. What is mass?

Mass is a physical property of matter that describes the amount of matter in an object. It is usually measured in kilograms (kg) or grams (g).

## 2. How is mass different from weight?

While mass is a measure of the amount of matter in an object, weight is a measure of the force of gravity acting on an object. Mass remains the same regardless of the location, while weight can vary depending on the strength of the gravitational pull.

## 3. How is mass measured?

Mass can be measured using a balance or scale. In scientific experiments, mass is measured using a tool called a triple beam balance, which compares the mass of an object to known masses on a series of weighted beams.

## 4. Can mass be changed?

No, mass is an intrinsic property of matter and cannot be changed. However, the amount of matter in an object can be altered by adding or removing particles, which would change its mass.

## 5. How does mass affect other properties of matter?

Mass is directly related to other properties of matter such as density, volume, and inertia. Objects with a larger mass will have a higher density, take up more volume, and require more force to change their state of motion due to their higher inertia.