Principle Area of Interaction:

Human IngenuityHuman Ingenuity

What are simple machines?

A device that makes a physical task easier.

Great ancient structures such as the pyramids & great wall of china must have been established using simple machines.

What type of simple machine could you identify in this picture?

Here are some examples of modern day machinesLook carefully at each tool.

Think about how each part moves and makes the other parts move as the tool does its job.

Which elements of machines do you see in each gadget?

Tools

In order for us to understand how simple machines help make our tasks easier, we have to understand the relationship between the following concepts:

* energy * distance* force * work

Answer #2 question in page 3 of your textbook.

Answers:a. source of the force:

the body pushing the weight upb. object the force of acting:

weightsc. interfering forces:

the force of gravity

Answers:a. source of the force:

the motor pulling the weight upb. object the force of acting:

elevatorc. interfering forces:

the force of gravity, friction

a. source of the force:the motor pulling the weight upb. object the force of acting:

the steel barsc. interfering forces:

the force of gravity, friction

a. source of the force:the person

b. object the force of acting: the bicycle pedals

c. interfering forces: weight, friction