Answer Physics Question: Is a Bullet Exerting Force? Advice for Studying Physics

In summary, a horizontally moving bullet slows down. Is anything exerting a force on it? Yes. Newton's 1st law. An object remains at rest or moves at a constant velocity unless it is acted on by an unbalanced force. The bullet is slowing down - therefore, there is an unbalanced force on the bullet. Is it exerting a force on anything? Yes. Newton's third law. Notice how nothing in the question says what the bullet is moving through - only that it is "horizontal" and it is "slowing down".
  • #1
256
18
I was thinking about force lately, after reading some physics 100 questions on the internet to see if I have what it takes to become a physicist.

For example, when you shoot a bullet, the chemical reaction that takes places exerts a force on the bullet for a short period of time (due to pressure). After that, the only force acting on the bullet is air resistance (slowing it down).

However, isn't it also true that the bullet exerts a force on anything it may encounter? Such as say air molecules? (The bullet exerts a force on any air molecules it comes in contact with, losing energy as thermal and slowing down)

What is the correct answer to a question like this one? How does this whole thing work?

"A horizontally moving bullet slows
down. Is anything exerting a force on it? How do you
know? Is it exerting a force on anything? How do you know?"

This isn't a homework question, its just something on the internet I'd like to know the answer to.

How would one answer this question? Am I thinking too deeply about physics? Or is deep thought what is required?

I would personally think this is the fact:
It exerts a force on air molecules, or anything that it may encounter because air around the bullet moves.
and
Air exerts a force on the bullet, because the bullet slows down.

EDIT: Also, any advice for someone looking to study physics?
 
Physics news on Phys.org
  • #2
Yes, the bullet exerts a force on anything it touches. The force exerted on the air is equal to the force the air exerts on it.

Newton's Third Law: When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction to that of the first body.
 
  • #3
x86 said:
What is the correct answer to a question like this one? How does this whole thing work?

"A horizontally moving bullet slows
down. Is anything exerting a force on it?
Yes.

How do you know?
Newton's 1st law.
An object remains at rest or moves at a constant velocity unless it is acted on by an unbalanced force.
The bullet is slowing down - therefore, there is an unbalanced force on the bullet.

Is it exerting a force on anything?
Yes.

How do you know?"
Newton's third law.
See Drakith.
The bullet has a force on it, therefore it is exerting a force on something else.

Notice how nothing in the question says what the bullet is moving through - only that it is "horizontal" and it is "slowing down". Sometimes you have to make assumptions of things that are not mentioned in the question, but you should try not to.

Am I thinking too deeply about physics?
Nope. About average.

Or is deep thought what is required?
You are doing fine - it usually requires quite shallow thought.
The question does not ask you to provide details about the force, where it comes from etc.
Having established the existence of a force or forces on the bullet and exerted by the bullet, you are then able to investigate the situation to figure out the details.

In this example, the bullet has to push the air out of the way - which means that there is moving air in the wake of the bullet.
This has knock-on effects like heat and sound... which are usually more easily handled in terms of energy. Something you seemed to naturally start to do when you wrote "...losing energy as thermal and slowing down"... which suggests you may have some talent there ;)
 

1. Is a bullet exerting force?

Yes, a bullet is exerting force. According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. When a bullet is fired from a gun, it exerts a force on the gun in one direction, and the gun exerts an equal and opposite force on the bullet in the other direction. This force propels the bullet forward with high velocity.

2. How does studying physics help in understanding the force of a bullet?

Studying physics helps in understanding the force of a bullet by providing a framework of fundamental principles and equations that govern the motion and interaction of objects. These principles, such as Newton's Laws of Motion, can be applied to analyze the forces acting on a bullet and determine its trajectory and impact.

3. What are some key concepts in physics that are relevant to the force of a bullet?

Some key concepts in physics that are relevant to the force of a bullet include acceleration, velocity, momentum, and energy. These concepts can be used to quantify the force of a bullet and understand its effects on its surroundings, such as the target it hits or the object it strikes.

4. What is the best way to study physics for a better understanding of forces?

The best way to study physics for a better understanding of forces is to have a strong foundation in basic concepts and principles, such as kinematics, dynamics, and energy. It is also important to practice solving problems and applying these principles to real-world scenarios, such as the force exerted by a bullet. Additionally, seeking out additional resources, such as textbooks, online tutorials, and study groups, can also aid in understanding forces in physics.

5. How can I improve my problem-solving skills in physics to better answer questions about forces?

Improving problem-solving skills in physics can be achieved through practice and persistence. Start by understanding the fundamental principles and equations related to forces, and then attempt to solve a variety of problems that involve forces, such as calculating the force exerted by a bullet or analyzing the motion of an object under the influence of forces. It is also helpful to break down complex problems into smaller, more manageable parts, and to seek help from peers or teachers when needed.

Similar threads

  • Classical Physics
Replies
10
Views
1K
  • Other Physics Topics
Replies
10
Views
2K
Replies
34
Views
1K
  • Introductory Physics Homework Help
Replies
1
Views
1K
Replies
17
Views
2K
Replies
5
Views
2K
  • Introductory Physics Homework Help
Replies
15
Views
345
  • Introductory Physics Homework Help
Replies
14
Views
3K
  • Introductory Physics Homework Help
Replies
10
Views
978
Back
Top