# Simple Machines

## 58 terms · Everything you need to know for a science test over simple machines!!!!

push or pull

### A force can do 4 things...

make an object move, slow down an object, stop an object from moving, and change the direction of the object

Newtons

Spring Scale

100 grams

### What 2 conditions must be met in order for work to be done

something has to move and the motion has to be in the direction of the applied force

### Is work being done when you carry an object a distance? Why?

No, the object isn't moving, you are!!!!!!

w = f x d

### The unit we use to measure work is:

Newton-meters (N-m) OR Joules (J)

### The formula for finding power us:

P = w divided by t OR P= f x d divided by t

Watts (W)

200 Watts

Simple Machines

### machines can be classified as either ___ or ___ machines

simple or compound

### The 6 simple machines are:

The Lever, The Pulley, The Wheel and Axle, The Inclined Plane, The Wedge, and The Screw

### The 3 smiple machines that are forms of an inclined plane are:

The Wedge, The Screw, and The Inclined Plane

### The 3 simple machines that are forms of a lever are:

The Lever, The Pulley, and The Wheel and Axle

### A Lever is made up of what 4 parts?

Resistance (Force and Arm), Effort (Force and Arm), Fulcrum, and a Plank/Bar

### The 2 arms of a lever are:

effort and resistance

1

### The 3 types of lever classes are:

1st class, 2nd class, and 3rd class

### the fulcrum, effort, and resistance are in what order in a 2nd class lever?

fulcrum, resistance, effort

The effort

5

### The formula for finding the MA of any simple machine is:

MA = RF divided by EF

4

40

### What are the 2 ways to find the MA of a lever?

MA = EA divided by RA or MA = RF divided by EF

### What are the 2 ways to find the MA of a wheel and axle?

MA = Wheel Diameter divided by Axle Diameter OR MA = RF divided by EF

### What are the 2 ways to find the MA of a pulley?

MA = RF divided by EF or fixed=1, moveable=2, and block and tackle=3 or more

### What are the 2 ways to find the MA of an inclined plane?

MA = l divided by h OR MA = RF divided by EF

### What are the 2 ways to find the MA of a wedge?

MA = RF divided by EF or MA = l divided by w

Friction

LARGER!

sliding

rolling

fluid

### 3 examples of fluids are:

water, oil, and air

lubricants

Gear

driven

driving

### Gear Ratios are caluculated by...

finding the LCM of the 2 gears based on the # of teeth they have, and dividing the LCM by the # of teeth they each have

driving

### The 3 types of pulley's are:

fixed, moveable, and block and tackle

### These pulleys change the direction of the applied force:

fixed and block and tackle

moveable

### What is the 1 major difference between a wedge and an inclined plane?

A wedge moves and an inclined plane doesn't

### A wedge can ____, ____, and ____

split, fasten, and cut

### The formula for IMA is:

Length divided by Height

friction

RF divided by EF

fasten and raise

### A force can be exerted on an object without work being done because...

force is exerted through distance

### This type of inclined plane gives a greater MA:

short in height and long in length