Mevhanical Devices

Question 1

Mechanical devices

Answer 1

Machines or tools that have at least one moving part that performs some functions

Question 2

Motion

Answer 2

That act of something being moved

Question 3

Motionless

Answer 3

Something at rest

Question 4

Mechanism

Answer 4

A series of parts that work together to control forces and motion in a desired way

Question 5

Rotary motion

Answer 5

Motion that follows the path of a circle

Question 6

Linear motion

Answer 6

Motion in a straight line

Question 7

Speed (equation)

Answer 7

Distance/ Time

Question 8

Oscillating motion

Answer 8

Motion that moves back and forth in a circular motion

Question 9

Reciprocating motion

Answer 9

Motion that moves back and forth in a straight line

Question 10

What does a Cam mechanism include?

Answer 10

-A cam attached to a shaft and a crank
-A follower that touches the cam and follows its shape

Question 11

Cycle

Answer 11

One complete rotation of the cam

Question 12

Dwell

Answer 12

When the cam rotates but the follower doesn’t move

Question 13

Fall

Answer 13

The movement of the follower

Question 14

Circular cam (3)

Answer 14

• Use an off-centre pivot to cause the follower to move up and down
• Produce a smooth up and down movement
• Used in steam engines

Question 15

Pear cam (2)

Answer 15

• Remains stationary for half a rotation then rises and falls
• Used in carousel houses

Question 16

Heart cam

Answer 16

• Allow follower too rise and fall at a regular speed
• 0 dwell time
• Used in some stop watches

Question 17

Snail cam

Answer 17

• Causes follower to remain stationary for half a turn before gently rising and then suddenly falling
• Only works in one direction
• Often used at production lines

Question 18

Types of follower (3)

Answer 18

1. Flat
2. Knife
3. Roller

Question 19

Drive gear

Answer 19

The gear that is moving

Question 20

Driven gear

Answer 20

The gear that only moves due to the drive gear

Question 21

Idler gear

Answer 21

A gear in between the drive and driven gear that ensures they go in the same direction

Question 22

Drive belts

Answer 22

Used to transfer drive from one pulley to another

Question 23

Lever

Answer 23

• A simple mechanism that controls and changes motion

Question 24

Effort

Answer 24

The input forces

Question 25

Load

Answer 25

The output forces

Question 26

Mechanical advantage (equation)

Answer 26

Load/ Effort

Question 27

Class 1 levers

Answer 27

- Act in a scissor or seesaw motion - Load and effort at opposite sides with fulcrum inbetween

Question 28

Class 2 levers

Answer 28

- Act in a wheelbarrow motion - Effort at opposite end to fulcrum with load inbetween

Question 29

Class 3 levers

Answer 29

- A pincer-like action like tweezers and tongs - The load is at opposite end to the fulcrum with the effort inbetween

Question 30

Equilibrium

Answer 30

When the effort and the load are equal

Question 31

Arm length

Answer 31

The distance between the fulcrum and the force