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Simple Machines SOL 3.2 By Ms. Weinberg.

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Presentation on theme: "Simple Machines SOL 3.2 By Ms. Weinberg."— Presentation transcript:

1 Simple Machines SOL 3.2 By Ms. Weinberg

2 Simple Machines Simple machines are tools used to make work easier by changing the size or direction of a force.

3 You have probably used some simple machines, but did not realize that they were actually called simple machines!

4 It would be hard to cut this wood without the saw!
Simple machines do not make less work; they just make it easier to do work. It would be hard to cut this wood without the saw!

5 There are 6 different types of simple machines:
(4) Pulley (1)Inclined Plane (2) Lever (5) Wheel and Axle (3) Screw (6)wedge

6 An inclined plane helps move heavy objects up or down.
An inclined plane is a flat surface that is raised so that one end is higher than the other. An inclined plane helps move heavy objects up or down.

7 A ramp is an example of an inclined plane.
Let’s add inclined plane to our list of simple machines (along with levers, screws, pulleys, and wheels & axles).

8 A lever is a stiff bar that moves about a fixed point (fulcrum).
A lever is used to push, pull, or lift things.

9 A shovel is an example of a lever.
A seesaw is another example of a lever.

10 A screw is an inclined plane wrapped around a cylinder or cone.
A common use of the screw is to hold objects together.

11 A jar lid and a wood screw are examples of a screw.
So far we have learned about 2 types of simple machines: levers & screws….

12 A pulley is a wheel that has a rope wrapped around it.
Pulleys can be used to lift heavy objects by changing the direction or amount of the force.

13 A flagpole uses a pulley to raise the flag.
Now we have learned about 3 types of simple machines: levers, screws, and pulleys…..

14 A wheel & axle consists of a rod attached to a wheel.
A wheel & axle makes it easier to move or turn things.

15 A bicycle wheel, roller skates, and a doorknob are all examples of a wheel & axle.
We now know about 4 types of simple machines: levers, screws, pulleys, and wheels & axles.

16 (6) WEDGE A wedge is wide at one end and pointed at the other to help cut or split other objects.

17 Examples of wedges: a knife or an ax

18 Mechanical Advantage: the number of times the machine multiplies force.
Ideal Mechanical Advantage (IMA) is what is desired of a machine, where Actual Mechanical Advantage (AMA) is what the machine actually does.

19 Compound Machines A compound machine consists of two or more simple machines put together. In fact, most machines are compound machines. Some examples are a pair of scissors and a bicycle.

20 Now you know about the 6 types of simple machines:
(4) WHEEL & AXLE (1) LEVER (2) SCREW (5) INCLINED PLANE (3) PULLEY (6) WEDGE

21 These simple machines make work easier!

22 The End!


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