Engineering- simple machines

Question 1

What’s engineering?

Answer 1

Anything g that’s been modified or changed, this involves studying, designing, and creating technological objects

Question 2

What is a simple machine?

Answer 2

This is a device with a few pieces that allows a task to be completed faster or with less effort

Question 3

Example of simple machine

Answer 3

Elevator

Question 4

What DONT simple machines do?

Answer 4

They dont reduce the amount of energy needed to do the task they distribute it longer or shorter.

Question 5

What does a lever do?

Answer 5

A stiff piece that pivots around d something called a fulcrum

Ex; nail clipper, shovel, seesaw

Question 6

What are the 6 types of different machines?

Answer 6

• lever
• inclined plane
• the pulley
• the screw
• the wedge
• the wheel and axel

Question 7

What is a fulcrum?

Answer 7

In a lever the movable bar can rest on a support called the fulcrum, the fulcrum is known as the PIVOT POINT

Question 8

Whats a resistance force?

Answer 8

What must be moved or lifted it is also known as the load.

Question 9

What is The effort force?

Answer 9

It is the force that must then be applied on the lever in order to have work done on. The load.

Question 10

What is a lever arm or effort arm?

Answer 10

Located between the fulcrum and the effort

Question 11

What is the load arm or resistance arm?

Answer 11

Is located between the fulcrum and the load

Question 12

What are the 3 classes of levers?

Answer 12

First class
Second class
 Third class

Question 13

What is a first class lever?

Answer 13

When the fulcrum is between the force and the load- the further away it is the harder it is to lift (think of a seesaw)

Question 14

What is the second class lever?

Answer 14

When the load is in The middle - its called as a power lever and is often used when really large distances because it is distributing the weight

Question 15

Third class lever

Answer 15

When the force is between the fulcrum and the load.

Question 16

Inclined plains

Answer 16

It’s a slop that reduces the force needed to lift or lower a load over a large distance

Question 17

What’s a wedge?

Answer 17

2 back to back inclined planes used to exert force on an object- if its not moving something but send to hole something in place its a wedge

Question 18

What are screws?

Answer 18

An inclined plane the circles an axes- in order for a screw to move it depends on the pitch

Question 19

What are the parts of a screw?

Answer 19

• Thread
• Pitch
• Shaft

Question 20

What is a pulley?

Answer 20

A wheel fitted with a cord that is used to help lift and lower loads
When you use more than 1 its called a HOIUST

Question 21

What is a wheel and axel?

Answer 21

Helps reduce force needed to move an object or to increase the distance an object can travel

Question 22

What is a motion transmission system?

Answer 22

Is a mechanism that TRANSMITS motion from one part to another without modifying it

Question 23

What are the 3 motions and what they do?

Answer 23

Rectilinear translation : motion in straight line
Rotational : circular motion
Helical motion: spiral motion

Question 24

What are the 4 types of motion transmission systems?

Answer 24

• friction gears
• Pulleys and belts
• gear trains
• train and sprocket wheels

Question 25

What are friction gears

Answer 25

Transmit rotational motion by contact motion by contact friction (rubbing ) between wheels

Question 26

Pulleys and belt?

Answer 26

Made of 2 or more pulleys (friction gears) and belt | Disadvantage is …if to much force is exerted the belt can slip of the pulleys

Question 27

Chain and socket wheels?

Answer 27

Made up of toothed wheels connected by a chain, motion is transmitted by teeth and wheels which fit the loops of the chain Cannot slip off the gears, as a result much more force can be used however all the pieces need to be lubricated

Question 28

Gear trains?

Answer 28

Made of tooth wheels known as gears that transmit rotational motion (gears) Used to increase or decrease the speed of motion Speed depends on size of gears and the number of teeth each gear has. The smaller the gear it’s faster, the bigger the gear the slower

Question 29

What’s motion of transformation?

Answer 29

Turns 1 types of motion into another

Question 30

What are the 3 types of transformation systems?

Answer 30

Rack and pinion Connecting rod and crank Cam and follower

Question 31

What’s a rack and pinion?

Answer 31

Made of a toothed wheel (pinion) and a straight toothed rod (rack)

Question 32

What’s a Cam and follower

Answer 32

A rotational motion into a bidirectional translational motion (Back and forth motion)

Question 33

What is a connecting rod and crank?

Answer 33

It’s a rotational motion to translational its a very fast but you have to lubricate it very often