Controlled Movement

Question 1

Explain what a mechanism is

Answer 1

a series of parts that work together to control forces and motion

Question 2

Explain what a system is

Answer 2

the general name for a set of mechanical or electronic parts that work together to produce a desired output.

Question 3

Explain what a force is

Answer 3

a push, pull or twist

Question 4

Explain what a rotary motion is

Answer 4

the motion that follows the path of a circle

Question 5

Give two examples of rotary motion

Answer 5

wheels and electric motor

Question 6

Explain what a linear motion is

Answer 6

motion in a straight line

Question 7

Give two examples of linear motion

Answer 7

conveyor belt and vehicle travelling in a straight line

Question 8

What is the formula to calculate speed

Answer 8

speed = distance / time

Question 9

What are the two units speed can be measured in

Answer 9

km/h and m/s

Question 10

Explain what an oscillating motion is

Answer 10

oscillating motion is similar to circular motion but the rotation moves back and forth in a circular path

Question 11

Give one examples of oscillating motion

Answer 11

electric toothbrush

Question 12

Explain what an reciprocating motion is

Answer 12

back and forth motion in a straight line

Question 13

Give one example of reciprocating motion

Answer 13

electric jigsaw

Question 14

What unit do you measure oscillating and reciprocating motion in?

Answer 14

oscillations per second

Question 15

Explain what an input is, give an example

Answer 15

the type of motion put in to a mechanism

movement of handles on scissors

Question 16

Explain what an output is, give an example

Answer 16

the type of motion a mechanism produces

movement of blades on scissors

Question 17

Explain what a lever is, give an example

Answer 17

a rigid bar that turns around a fulcrum

a car brake pedal

Question 18

Explain what a fulcrum is

Answer 18

the pivot around which a lever turns

Question 19

Explain what an effort is

Answer 19

the input force

Question 20

Explain what a load is

Answer 20

the output force

Question 21

Explain what an arm length is

Answer 21

the distance between the force being exerted and the fulcrum

Question 22

Explain the relation between arm length and the force

Answer 22

the larger the arm length the larger the distance the force must move therefore the smaller the force

Question 23

Explain what a torque is

Answer 23

a turning or twisting force

Question 24

Explain what a cam and follower is

Answer 24

a mechanism to convert rotary motion to reciprocating motion.

Question 25

Give three examples of cam profiles

Answer 25

snail , pear shaped, eccentric

Question 26

Explain what a spur gear is

Answer 26

a wheel with teeth around its edge

Question 27

Explain what a simple gear train is

Answer 27

a pair of gears consisting of a driver gear and a driven gear

Question 28

Explain what a pinion is

Answer 28

a small driver gear(smaller than the driven gear)

Question 29

Explain what shafts are

Answer 29

a rod that transfers the rotation through a mechanism.

Question 30

Explain what lubrication is

Answer 30

a substance applied to reduce friction between moving parts

Question 31

Explain what a pulley and belt are

Answer 31

a method of transferring rotary motion between two shafts

Question 32

Explain what a linkage is

Answer 32

a component used to direct forces and movement to where they are needed

Question 33

Give three examples of linkages

Answer 33

bell crank , peg and slot , crank and slider