Simple Machines

Question 1

Which order machine has the fulcrum in the middle?

Answer 1

First Order

Question 2

Which order machine has the load in the middle?

Answer 2

Second Order

Question 3

Which order machine has the effort in the middle?

Answer 3

Third Order

Question 4

What does MA stand for?

Answer 4

Mechanical Advantage

Question 5

How do you calculate MA?

Answer 5

MA = Load/Effort

Question 6

What does VR stand for?

Answer 6

Velocity Ratio

Question 7

How do you calculate VR in simple machine?

Answer 7

VR = Distance effort moves/Distance load moves

Question 8

What is the formula for efficiency (n)?

Answer 8

n = 100MA/VR

Question 9

What does SR stand for?

Answer 9

Speed ratio

Question 10

How do you calculate VR for gears?

Answer 10

radius or number of cogs on driven / radius or number of cogs on driver

Question 11

How do you calculate SR for gears?

Answer 11

radius or number of cogs on driver / radius or number of cogs on driven

Question 12

What is the size of gears in a reducing gear?

Answer 12

Driver wheel is smaller than driven wheel (The velocity is reduced)

Question 13

What is the size of gears in a multiplying gear?

Answer 13

Driver wheel is larger than driven wheel (The velocity is multiplied)

Question 14

How do you calculate SR for gears?

Answer 14

SR = radius or number of cogs on driver / radius or number of cogs on driven

Question 15

How do you calculate RPM in gears?

Answer 15

RPM = Input Speed x SR

Question 16

How do you calculate Moment?

Answer 16

Moment = Force x Distance

Question 17

How do you calculate VR for pulley belt?

Answer 17

Radius, Diameter , Circumference of Driven / Radius, Diameter, Circumference of Driver

Question 18

How do you make the direction of rotation opposite in a pulley?

Answer 18

Cross the belts

Question 19

VR of Inclined plane?

Answer 19

VR = 1/sin(θ)

Question 20

MA of inclined plane?

Answer 20

MA = 1/sin(θ)

Question 21

What is a pitch in a screw jack?

Answer 21

The distance from the top of one thread to the top of the next thread directly under it

Question 22

VR of screw jack?

Answer 22

VR = 2πr/p

Question 23

State what the following means:
M18x2

Answer 23

M = Metric
18 = diameter
2 = pitch

Question 24

VR of wheel and axle system?

Answer 24

VR = R/r or D/d

Question 25

VR of Hydraulics?

Answer 25

VR = Area of output piston/Area of input piston or VR = Distance input piston moves/Distance output piston moves or VR = Diameter of output pison ^2 / Diameter of input piston ^2

Question 26

How do you calculate the velocity ratio of a pulley?

Answer 26

The number of ropes attached