# Help Force and simple dynamics

• mrnastytime
In summary, the problem involves finding the force exerted by a large fixed piece of wood on a bullet with a mass of 0.002 kg, which initially moves at 510 m/s and embeds itself in the wood, traveling 0.78 m before coming to rest. The solution involves using the velocity vs function equation and the formula f=ma, resulting in a force of 333 N.
mrnastytime

## Homework Statement

A bullet of mass 0.002 kg initially moving at 510 m/s embeds itself in a large fixed piece of wood and travels 0.78 m before coming to rest. Assume that the acceleration of the bullet is constant.

## Homework Equations

What force is exerted by the wood on the bullet?

## The Attempt at a Solution

In order to find the force, I had to solve for acceleration using the velocity vs function equation: v^2=V0^2 + 2a$$\Deltax$$
a=v^2-V0^2/2$$\Deltax$$
a=0-(510)^2/2(.78)
I plugged in the numbers to the equation f=ma, but it doesn't work. Can anybody help me?

It seems to work fine using the equations you posted, which seem correct. Can you show your work, and explain what you mean by the statement, "It doesn't work"?

a=0-(510)^2/2(.78)
a=-166730.76
f=0.002kg * -166730 m/s^2
f=-333.46

I entered this answer into my homework online and it is incorrect

Nice work; your answer is correct. Should you include units when you enter an answer into your homework on-line? If so, add capital N, for Newtons. If that fails, try removing the negative sign (even though the negative sign is correct). If that fails, try entering your answer to only three significant digits, instead of five. If that fails, the on-line program might be wrong or malfunctioning.

Last edited:
Thanks! the answer is 333 N

## What is Help Force and what do they do?

Help Force is a volunteer-based organization that focuses on providing assistance and support to those in need, both locally and globally. They do this by organizing various outreach programs, fundraising events, and other initiatives aimed at helping the community.

## What is simple dynamics and why is it important?

Simple dynamics is a branch of physics that studies the motion of objects and how they respond to forces. It is important because it helps us understand how things move and interact with each other, which is essential in many areas of science and engineering.

## How does Help Force use simple dynamics in their work?

Help Force uses simple dynamics in various ways, such as understanding the dynamics of natural disasters to better respond and provide aid, and using principles of motion to design and build more efficient and effective equipment for their outreach efforts.

## What are some real-life examples of simple dynamics in action?

Some real-life examples of simple dynamics include objects falling due to gravity, the motion of a pendulum, and the movement of a car on a road. Other examples include the flight of a bird, the motion of a roller coaster, and the swinging of a playground swing.

## How can understanding simple dynamics benefit society?

Understanding simple dynamics can benefit society in many ways. It allows us to design and build safer and more efficient structures, develop new technologies, and improve our understanding of natural phenomena. It also helps us make more informed decisions in areas such as public safety, transportation, and environmental conservation.

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