Calculating Frictional Force on a Bullet Using the Momentum Formula

In summary, a 6g bullet with a muzzle velocity of 390m/s is fired from a rifle into a block of wood, creating an 18cm deep hole. To find the magnitude of the average frictional force that slowed the bullet, the equation for work (W=Fd) can be used. After considering the work done by the frictional force, the equation becomes W=1/2mVf^2-1/2mVo^2. Since the bullet comes to rest, Vf becomes 0, and the final answer is W=Fd=456.3.
  • #1
nrc_8706
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a rifle fires a(n) 6g bullet with a muzzle velocity of 390m/s into a block of wood. the bullet comes to rest after it has made a(n) 18cm deep hole in the wood. what is the magnitude of the average frictional force slowed the bullet?

can i use this formula?
J=FT=pf-pi=mv
 
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  • #2
You could, but you'd first have to figure out the time. Instead, consider the work done by the frictional force on the bullet.
 
  • #3
What would you use for the time?

I suggest asking yourself how much work the frictional force does.
 
  • #4
is it W=Kf-Ko ?
 
  • #5
yes, but make sure not to forget that the work done by friction will be negative.
 
  • #6
so...W=1/2mVf^2-1/2mVo^2 does Vf cancel since it comes to rest?
 
  • #7
yes, it does
 
  • #8
the answer is W=456.3 is that all?
 
  • #9
you've found the work, but the question wants to know the force. so what is the equation for work?
 
  • #10
is it W=Fd
 
  • #11
yes, that's right
 
  • #12
Thank You So Much!
 

1. What is a bullet and block?

A bullet and block is a type of experiment commonly used in physics to study the relationship between force and acceleration. It involves launching a bullet or projectile into a block of wood or other material and measuring the resulting acceleration of the block.

2. How does a bullet and block experiment work?

In a bullet and block experiment, a bullet or projectile is fired into a block of wood or other material. The impact of the bullet causes the block to accelerate, and this acceleration is measured using sensors or other equipment. The data collected can then be used to calculate the force exerted by the bullet and the resulting acceleration of the block.

3. What are the advantages of using a bullet and block experiment?

One advantage of using a bullet and block experiment is that it allows for the precise measurement of force and acceleration. It also provides a simple and controlled way to study these concepts in a laboratory setting. Additionally, the materials needed for the experiment are relatively inexpensive and easy to obtain.

4. What are some potential applications of a bullet and block experiment?

Bullet and block experiments have a variety of applications in fields such as physics, engineering, and forensics. They can be used to study the properties of different materials, test the effectiveness of armor or other protective gear, and analyze the impact of bullets or other projectiles on objects.

5. Are there any safety precautions to consider when conducting a bullet and block experiment?

Yes, safety precautions should always be taken when conducting a bullet and block experiment. This may include wearing protective gear, such as safety glasses, and ensuring that the experiment is conducted in a controlled and secure environment. It is also important to follow proper handling and storage procedures for any firearms or other equipment used in the experiment.

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