Controlled Movement Flashcards
Explain what a mechanism is
a series of parts that work together to control forces and motion
Explain what a system is
the general name for a set of mechanical or electronic parts that work together to produce a desired output.
Explain what a force is
a push, pull or twist
Explain what a rotary motion is
the motion that follows the path of a circle
Give two examples of rotary motion
wheels and electric motor
Explain what a linear motion is
motion in a straight line
Give two examples of linear motion
conveyor belt and vehicle travelling in a straight line
What is the formula to calculate speed
speed = distance / time
What are the two units speed can be measured in
km/h and m/s
Explain what an oscillating motion is
oscillating motion is similar to circular motion but the rotation moves back and forth in a circular path
Give one examples of oscillating motion
electric toothbrush
Explain what an reciprocating motion is
back and forth motion in a straight line
Give one example of reciprocating motion
electric jigsaw
What unit do you measure oscillating and reciprocating motion in?
oscillations per second
Explain what an input is, give an example
the type of motion put in to a mechanism
movement of handles on scissors
Explain what an output is, give an example
the type of motion a mechanism produces
movement of blades on scissors
Explain what a lever is, give an example
a rigid bar that turns around a fulcrum
a car brake pedal
Explain what a fulcrum is
the pivot around which a lever turns
Explain what an effort is
the input force
Explain what a load is
the output force
Explain what an arm length is
the distance between the force being exerted and the fulcrum
Explain the relation between arm length and the force
the larger the arm length the larger the distance the force must move therefore the smaller the force
Explain what a torque is
a turning or twisting force
Explain what a cam and follower is
a mechanism to convert rotary motion to reciprocating motion.
Give three examples of cam profiles
snail , pear shaped, eccentric
Explain what a spur gear is
a wheel with teeth around its edge
Explain what a simple gear train is
a pair of gears consisting of a driver gear and a driven gear
Explain what a pinion is
a small driver gear(smaller than the driven gear)
Explain what shafts are
a rod that transfers the rotation through a mechanism.
Explain what lubrication is
a substance applied to reduce friction between moving parts
Explain what a pulley and belt are
a method of transferring rotary motion between two shafts
Explain what a linkage is
a component used to direct forces and movement to where they are needed
Give three examples of linkages
bell crank , peg and slot , crank and slider
