Chapter 3 Machines

The use of machines reduces the work to be done and allows us to apply less effort to achieve it.

• Yes

• No

• Maybe

The wedge is an object, or part of an object, that ends in an acute angle.

• Yes

• No

• Maybe

Is an object, or part of an object, that ends in an acute angle?

• wheel and axle

• wedge

• lever

• inclined plane

Are machines that have only one part?

• Compound machines

• Combined machines

• Simple machines

• Powered machines

What are the characteristic of machines?

• They transform the energy they receive

• They run on energy.

• The energy they receive of their operation is not fully exploited; part of it lost through friction

• They do not transform energy.

The ______ are machines that are formed of two or more simple machines.

• Compound machines

• Combined tools

• Simple machines

• Energy machines

The purpose of a machine is always for the work to cost us less effort, make it easier, and also safer.

• True

• False

An electrical motor is a machine that transforms electrical energy into mechanical energy by means of magnetic fields.

• Yes

• No

• Maybe

Machines make tasks easier because they ______ the effort (force) you need to do it.

• increase

• multiply

• reduce

A way to transfer energy from one body to another?

• work

• kinetic energy

• potential energy

• Law of Conservation of Energy