Work
IMA
Efficiency
Machines
Calculations and Misc.
100
In order for you to do work, the object must ___________
move a distance
100
What is the IMA of a pulley?
# of strings
100
What is the equation for efficiency?
output work/input work x 100
100
Name the six simple machines
pulley, inclined plane, wedge, wheel/axle, screw, lever
100
What is the point on the lever that does not move?
fulcrum
200
What is the equation for work?
Work= Force x distance
200
What is the IMA of a ramp?
length of ramp/ height of ramp
200
What is efficiency?
how well a machine uses the input work to produce output work
200
Give me to examples of a wedge.
axe, door stop, knife
200
Lift a 30N book 2m up. What is the work?
60 Joules
300
What is the unit of work?
Joules
300
What is the IMA of a wheel and axle?
radius of wheel/ radius of axle
300
What causes a machine to be less efficient?
friction
300
Give me an example of each class of lever, and tell me what is in the middle.
first: fulcrum (scissors) second: output (wheelbarrow) third: input (tongs, rake)
300
A simple machine that uses 2 or more simple machines are called ___________
compound machines
400
In order to do work, the force and the distance must be ___________
in the same direction
400
What is the IMA of a screw?
circumference of screw/ distance between threads
400
An ideal machine would have an efficiency of ___________
100%
400
Give me an 2 examples of a pulley and 2 examples of a screw.
pulley: well, elevator, window blinds screw: bottle cap, light bulb
400
What is the efficiency of a machine that uses 4000J to do 3000J of work?
75%
500
I push 80 Newtons to move a box 9 meters. How much work did I do?
720 Joules
500
What is the IMA of a lever?
input to fulcrum/ output to fulcrum
500
A lightbulb gives off 200J of work while it uses 500J of energy, what is its efficiency?
40%
500
What are the 3 ways machines make work easier?
multiply force multiply distance change direction
500
What is the IMA of an inclined plane that is 2 meters high, and 8 meters long?
4
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