5th Grade Work, energy, effort, and machines

A way to transfer energy from one body to another.

• work

• effort

• distance

• energy

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

• work

• force

• distance

• energy

Energy stored.

• work

• kinetic energy

• potential energy

• energy

The Law of Conservation of Energy states that...

• the energy is not created or destroyed: it only transforms.

• the energy is created, destroyed and transformed.

• the energy is created or destroyed never transformed.

The more potential energy or kinetic energy an object has, the more ability it will have to produce a change; in other words, it will have a greater ability to do work.

• True

• False

Select all the things that are true for machines:

• Instruments that allow us to do a job with less effort

• Used to change the direction of force or reduce the amount of force that we apply.

• Purpose is always for the work to cost us less effort, make it

  easier, and also safer.

• Can't be classified according to their parts.

Effort is...

• Result of the force we exert when we realize a work with a machine

• A way to transfer energy from one body to another

• Basically a ramp: a flat surface that is raised at only one end

Some of the characteristics of machines are:

• Run on energy

• Transfer the energy they received

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

• All the energy they received is fully exploited.

Select all the statements that are true for simple machines

• when a machine has only one part

• examples are: pulley, lever, wheel and axle

• examples are: wedge, inclined plane, and screw

• examples are: lawn mower, can opener and plow

Select all the statements that are true for levers:

• machine that humans have use the most since the beginning of its history

• consists of a rigid bar that is free to move on a point of support, called the fulcrum

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