Definitions

Question 1

Mechanical system mobility

Answer 1

Degrees of freedom

Question 2

3 translational motions

Answer 2

X, y, z

Question 3

Only angular orientation changes

Answer 3

Pure rotation

Question 4

All points on the body follow parallel paths

Answer 4

Pure translation

Question 5

Combination of rotation and translation

Answer 5

Complex motion

Question 6

Link with two nodes

Answer 6

Binary

Question 7

Link with three nodes

Answer 7

Ternary

Question 8

Link with four links

Answer 8

Quarternary

Question 9

Connection between two or more links at their nodes (KINEMATIC PAIRS) that allows motion between connected links

Answer 9

Joints

Question 10

Joint with surface contact

Answer 10

Lower pair

Question 11

Joints with point or line contact

Answer 11

Higher pair

Question 12

6 basic mechanical components

Answer 12

Link, wheel, cam, screw, ratchet, belt

Question 13

5 types of relative motion

Answer 13

Rolling, sliding, linkages, wrapping, connectors, tackle

Question 14

6 types of Lower Points

Answer 14

Revolute, Prismatic, Helical, Cylindric, Spehrical, Planar

Question 15

Sliding motion along the axis

Answer 15

Prismatic or Slider Pairs

Question 16

Purely rotational motion along joined axis

Answer 16

Revolute

Question 17

LP (lower pair) 1 DOF

Answer 17

Prismatic, Helical and Revolute

Question 18

LP 2 DOF

Answer 18

Cylindric

Question 19

LP 3 DOF

Answer 19

Spherical and Planar

Question 20

2 DOF HP (higher pair) joints have 2 motions happening at the same time

Answer 20

Half joint

Question 21

Joint require external force to keep together

Answer 21

Force closed joint

Question 22

Joint is kept together by its build (geometry)

Answer 22

Form closed joint

Question 23

Mechanism used to open and close valves

Answer 23

Cam follower

Question 24

How many links does it take to create 1 joint?

Answer 24

2

Question 25

Assemble of links and joints connected to produce output motion from input motion

Answer 25

Kinematic chain

Question 26

Kneimatic chain with one link grounded or attached to frame

Answer 26

Mechanism

Question 27

Machine

Answer 27

Collection of mechanisms arranged to do work and and transmit forces

Question 28

A link makes complete revolution and pivoted to the ground.

Answer 28

Crank

Question 29

A link that goes back and forth rotation and pivoted to the ground

Answer 29

Rocker

Question 30

A link that has complex motion (rotation and translational) and is NOT pivoted to the ground

Answer 30

Coupler

Question 31

Link between joints that allows relative motion between links

Answer 31

Kinematic links

Question 32

Open kinematic chain of 2 binary links and 1 joint

Answer 32

Dyad

Question 33

Any link in a plane 3 DOF

Answer 33

Gruebler condition

Question 34

Connecting 2 unconnected links reduces the DOF by how many? What will be the final DOF?

Answer 34

2, 6

Question 35

Connecting 2 unconnected links by a half joint, how much does it reduce the DOF? How much is the final DOF?

Answer 35

1,5

Question 36

M=3(L-1)-2J-J2

Answer 36

Kutzback’s equation