Topic 1 Flashcards
(40 cards)
What is a simple machine?
A mechanical device that can transmit, change magnitude or direction of a force
What are the 6 simple machines?
- lever
- wheel and axle
- pulley
- inclined plane
- wedge
- screw
What is a basic machine?
a modified simple machine or a machine using only several simple machines
What is linear motion?
motion in a straight line in a horizontal or vertical direction
What is rotary motion?
motion in a continuously circular path that is about an axis
What is oscillatory motion?
repeated motion where the same movement is repeated
What is reciprocal motion?
repetitive back and forth or up and down linear motion
What is using motion?
utilises various types of motion
What is the motion of a rocking chair?
oscillating
what is the motion of a gear?
rotary
What is the motion of a saw?
reciprocal
What is Mechanical Advantage?
The ratio of the force produced by a machine to the force applied to it
What is Velocity Ratio?
The ratio of the distance moved by effort to the distance moved by the load in a simple machine.
What is efficiency?
The measure of how much work goes into moving something compared to mechanical advantage.
If the input force is 80N and the output force is 160N. Calculate mechanical advantage
2
if something moves 200mm when the effort moves 600mm. Calculate velocity ratio
3
What is a first order lever?
the fulcrum is between the effort and the load
What is a second order lever?
the load is between the fulcrum and the effort
What is a third order lever?
the effort is between the load and the fulcrum
Is a driver gear the effort or load?
effort
Is a driven gear effort or load?
load
What are three types of gears?
- spur
- worm and worm gear
- rack and pinion
How do you calculate the VR of a spur gear?
number of teeth on driven/number of teeth on driver
How do you calculate the VR of a worm gear?
number of teeth on worm gear/number of threads on worm
