Lesson 1072 of 1524
Work, Energy, and Simple Machines
The work-energy theorem states that an amount of work that changes the velocity of an object is equal to the change in kinetic energy of that object.The work-energy theorem states that an amount of work that changes…
Practice this chapterThe work-energy theorem states that an amount of work that changes the velocity of an object is equal to the change in kinetic energy of that object.The work-energy theorem states that an amount of work that changes… Doing work on a system or object changes its energy
Mechanical energy may be either kinetic (energy of motion) or potential (stored energy)
simple machine — a machine that makes work easier by changing the amount or direction of force required to move an object. work — force multiplied by distance. mechanical advantage — the number of times the input force is multiplied. power — the rate at which work is done.
Worked example
What does “simple machine” mean in Work, Energy, and Simple Machines?
- 1Use the wording this chapter gives for simple machine.
- 2The book says: a machine that makes work easier by changing the amount or direction of force required to move an object.
- 3Do not use the meaning of work. That term means force multiplied by distance.
Result: a machine that makes work easier by changing the amount or direction of force required to move an object
Why. That is the meaning this chapter gives for simple machine.
Do not swap simple machine and work. simple machine means a machine that makes work easier by changing the amount or direction of force required to move an object. work means force multiplied by distance.
Practice margin
This chapter
A fresh set from this chapter only. Choose 10 or 20. Multiple choice and fill-in, with no repeat inside the set.