Mechanical components and devices Flashcards
1
Q
Rotational Speed =
A
Rotational Speed = number of revs/time
2
Q
Linear Speed =
A
Linear Speed = distance/time
3
Q
What is a mechanism?
A
They can increase force and reduce distance
OR
increase distance and reduce force
think of moments in physics
4
Q
Examples of mechanisms are …..
A
levers linkages pulleys cams gears rack and pinion
5
Q
Describe a lever
A
Levers have: a fulcrum (pivot) a input force (the effort) an output force (the load) They rely are the principle of moments
6
Q
What is rotational motion?
A
Movement in a circle
7
Q
What is linear motion?
A
Movement in a straight line
8
Q
What is reciprocating motion?
A
Movement back and forth in a straight line
9
Q
What is oscillating motion?
A
Constant movement from side to side along a curved path
10
Q
What are the different types of Linkage?
A
- Pulleys (Linear to Linear in opposite directions)
- Gear systems (Rotary into Rotary)
- Rack and pinion (Rotary into Linear)
- cams (Rotary to Reciprocating)
- bell crank (transfers motion round a corner)
- peg and slot (rotary to oscillating)
- crank and slider (rotary to reciprocating)
11
Q
What is the mechanical advantage equation?
A
- MA=Load/Effort
12
Q
Why do we use levers?
A
- To gain mechanical advantage
- This makes lifting something easier
13
Q
What is the moments equation?
A
F1 D1 = F2 D2
14
Q
What is a class 1 lever?
A
- A seesaw
15
Q
What is a class 2 lever?
A
- A wheelbarrow
