Chapter 9 Machines

Is the force that is applied to an object that displaces or moves it in the direction of that force

• work

• kinetic energy

• potential energy

• effort

Is related to movement

• kinetic energy

• potential energy

• effort

• work

the energy related to energy stored

• kinetic energy

• potential energy

• effort

• law of conservation of energy

the result of the force we exert when we realize a work with a machine.

• effort

• work

• potential energy

• kinetic energy

The _____ are instruments that allow us to do a job with less effort.

• machines

• kinetic energy

• potential energy

• effort

the machines are used to change the direction of force or reduce the amount of force that we apply

• True

• Flase

The purpose of the machines is always for work to cost us more effort, make it difficult, and also unsafe.

• True

• False

Law of Conservation of Energy states:

• that the energy is created, neither transformed

• that energy is not crated or destroyed, but transformed

Select the characteristics of the machines:

• they run on energy

• transforms the energy they receive

• the energy they receive is not fully exploited; part of it is lost through friction

• are formed from two or more simple machines

Machines are classified ________

• according to their size

• according to their parts