Observe: How do Simple Machines help us to do WORK?

Visit each of the following sites to review this content to answer the questions that follow.


1)Simple machines are so “SIMPLE” because they what?

2)When you are using simple machines, the amount of WORK you do is the __________!

3)A simple machine helps us by _________________ the amount of FORCE or ________________ the distance we apply it!

CLICK the link on the RIGHT for a TYPE OF SIMPLE MACHINE & Complete the CHART:


1. Label the type of LEVER as First, Second or Third class lever.

2. Label the EFFORT, LOAD and FULCRUM in each drawing.

3. Write TWO examples for each type of lever.


Read about the different kinds of pulleys and answer these questions:

1. A pulley is usually made of a rope, belt or chain that changes the ______________ of the force to lift an object.

2.A disadvantage of a fixed pulley is that when used individually, uses more _____________ than the  load to lift it.

3. A movable pulley moves with the ______________ and uses ____________ effort to lift the load.

4.Although a combined pulley decreases the effort needed to lift the load to less than  ____________ the weight of the load, it also increases the _________________.


Click “It’s all About Mechanical Advantage”

1. The efficiency of any machine compares the work that comes out of it, called the ________________  _______________, to the work that goes into it, called the ________________  _______________.

The mechanical advantage of a machine tells us how much a machine CHANGES the amount of FORCE you put in compared to how much FORCE the machine puts out.

2. The mechanical advantage of wedge is determined by dividing the length of the _______________ by the __________________ of the widest end.

3.The mechanical advantage of an inclined plane is equal to the _____________ of the slope divided by the ________________ of the inclined plane.

4.The mechanical advantage of a lever is determined by the ratio of the distance from the force to the ________________ divided by the distance from the fulcrum to the resistance.

5.The mechanical advantage of a wheel and axle is the ratio of the radius of the _______________ to the _______________ of the axle.

6.The mechanical advantage of a screw is equal to the ________________________ of the screwdriver handle divided by the ________________ of the screw.

7.The mechanical advantage of a pulley system (called a _____________& __________) is equal to the number of ropes that support the pulleys.

A compound machine is a device made up of more than one of these simple machines. 

GOTO:  Click on the TOOL SHED and try to locate all of the simple machines in each object!

Next, GOTO

Read and find ALL the simple machines in the lawnmower and submit your answers to see if your right!



& QUIZ Yourself!