Eng and sci Exam Study Flashcards
Bevel gear and crown gear do?
Speed up and slow down, makes something change in 90 degrees
Same thing
Spur gear and idler gear
To spread up or slow down
To help with the direction
Worm gear
Makes something slow down and changes axis of rotation
3 types of forces
Tensile force- stretch or pull apart
Compressive- squash or push together
Shearing- top falling over bottom like twisting
Hooked law
Force= force constant times change in lengths
Mechanical advantage equation?
And example
Load/effort and an example is load distance 5cm/ effort distance 10 to have a mechanical advantage of 2
Metres per second is a measurement of,
Speed
Newtons-meters is a measure of?
Torque
Something that goes forward?
Up and back repetitive
Around in a circle
Up back like a wave or sea saw
Linear
Reciprocation
Rotary
Oscillation
When you are being stretched out?
Tension
Weight is a measurement of how heavy your body is measured in kilograms?
False it’s your body mass
Try to lift 2000n but a pump only required him to use 400n in effort, what the MA?
2000/400
5 MA
If there is one rope in a pulley the MA EQUALS
1
Which gear changes rotary to linear motion??
Rack and pinion
Bevel gear is to change the axis of rotation but no the gear ratio
True
Gears that change rotary to refiprocating?
Cam gear
When u are spinning a handle and it has 8 teeth and the other two that it’s spinning have 24?
The ratio is 3 to 1
Class of levers?
1: fulcrum is in middle
2: lad in middle, effort at end and fulcrum start
3: effort in middle, load and fulcrum at ends
Tru
Can a first class lever have a mechanical advantage of more than lne?
True
If it’s kg and you need to convert it to newtons it has to be times by 10!
200kg times 10= 2000n
Effort= load/4
2000/4= 500n
Length divided by width, what is the mechanical advantage
Length of a axe 30cm and width 10cm.
The MA equals 31
