Simple Machines

Question 1

what is a simple machine?

Answer 1

a device that makes work easier by changing the direction or magnitude of a force

Question 2

input force is called?

Answer 2

effort

Question 3

output force is called

Answer 3

load

Question 4

the primary purpose of a machine is to make work ________ by reducing the amount of _______ to perform a task

Answer 4

easier
effort

Question 5

the resistance or the force that is being moved or lifted by a machine is called the _______?

Answer 5

load

Question 6

the force applied to overcome a load is known as ?

Answer 6

effort

Question 7

what are the 6 general simple machines:
1.
2.
3.
4.
5.
6.

Answer 7

Leaver
pulley
screw
inclined plane
wedge
wheel and axle

Question 8

what is the formula for mechanical advantage?

Answer 8

MA= Load
÷
Effort

Question 9

mechanical advantage may also be known as ?

Answer 9

Force Ratio

Question 10

the formula for velocity ratio is?

Answer 10

VR= Distance of Effort
÷
Distance of Load

Question 11

velocity ratio may also be known as ?

Answer 11

movement ratio

Question 12

what is the formula for mechanical efficiency?

Answer 12

N= MA /VR × 100 = %

N- Effiency
MA- Mechanical Advantage
VR- Velocity Ratio

answer is represented as a percentage

Question 13

What is the formula for Velocity Ratio of a Screw Jack?

Answer 13

VR= 2pieR (circumference) ÷ P (pitch)

Question 14

what is Pitch when related to Screws?

Answer 14

pitch is the distance between threads on a screw

Question 15

what is a worm?

Answer 15

a gear that resembles a screw

Question 16

what is a worm wheel?

Answer 16

a gear that meshes with the worm

Question 17

the first step in solving VR for a worm and worm wheel is finding the?

Answer 17

Gear Ratio

Question 18

what is the formula for finding Gear ratio of a worm and worm wheel?

Answer 18

Gear ratio= one revolution of the worm / one revolution of the wormwheel

Question 19

what is the formula for MA of a Worm and Worm Wheel?

Answer 19

MA= Load/Effort

MA= number of teeth on the worm wheel÷ number of threads on the worm

Question 20

what is the formula for VR of a worm and wormwheel?

Answer 20

VR= circumference of path handle× gear ratio
÷
circumference of winch

eg

VR= 2pie L x Gear Ratio
___________________
2pie R

Pie cancels out:

VR = L × Gear Ratio
_______________
R

Question 21

a wheel and axle functions as a mechanism that uses a _________ to turn or move a ________ with the help of a rotating _________

Answer 21

wheel
load
axle

Question 22

what is the formula for mechanical advantage of a wheel and axle?

Answer 22

MA= Radius of the wheel
______________________
radius if the axle