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(I) A hammerhead with a mass of 2.0$\mathrm { kg }$ is allowed to fall onto a nail from a height of 0.50$\mathrm { m }$ . What is the maximum amount of work it could do on the nail? Why do people not just "let it fall" but add their own force to the hammer as it falls?

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$9.8 \mathrm{J}$

Physics 101 Mechanics

Chapter 7

Work and Energy

Work

Kinetic Energy

Potential Energy

Energy Conservation

Danail A.

November 27, 2020

Simon Fraser University

Hope College

University of Winnipeg

McMaster University

Lectures

04:05

In physics, a conservative force is a force that is path-independent, meaning that the total work done along any path in the field is the same. In other words, the work is independent of the path taken. The only force considered in classical physics to be conservative is gravitation.

03:47

In physics, the kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body in decelerating from its current speed to a state of rest. The kinetic energy of a rotating object is the sum of the kinetic energies of the object's parts.

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A hammerhead with a mass o…

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If we had let a hammer had hit a nail with only the work done by gravity, it would be equal to this. The work done by gravity's the mass times acceleration due to gravity times the distance co sign of data We know that in this case, coastline of fate as an equal one. So this will simply be the mass of the hammerhead. Two kilograms times the acceleration due to gravity 9.8 meters per second squared times the distance it travels 0.5 meters and we know that this work done by gravity is going to be equal to nine point a Jules. So we know that 9.8 Jules is not a large amount of work. And this is why when in order, tio actually hammer and a nail into a wall, one must actually provide much more force than simply the force due to gravity. So in this case, that is why is obviously encouraged. Teo put some of your own force in it in order to effectively hammer in the nail again. The work done by gravity is only 9.8. Jules, that is the end of the solution. Thank you for watching

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