Work And Machines Question Preview (ID: 36199)
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In order to do work on an object, the object must ____________________ as a result of the force
a) move some distance
b) ideal mechanical advantage
c) tendons
d) axle
Compound machines are
a) machines that use gears
b) machines that used to make mixtures
c) combinations of simple machines
d) machines that use wheels
When you bend your arm at the elbow, the fulcrum is at your
a) wrist
b) elbow
c) bicep
d) elbow
The fixed point that a lever rotates around is called a(n)
a) fulcrum
b) wedge
c) input force
d) output force
A car's steering wheel is an example of a simple machine called a
a) lever
b) wheel and axle
c) inclined plane
d) screw
An ax, zipper, and a front tooth are examples of a simple machine called a
a) lever
b) screw
c) wedge
d) pulley
You divide the radius of a wheel by the radius of an axle. What are you calculating?
a) The ideal mechanical advantage of a wheel and axle
b) the ideal mechanical advantage of the pulley
c) The efficiency of a wheel and axle
d) The actual mechanical advantage of a screw
A machine can make work easier by
a) dividing the force needed to accomplish a task
b) decreasing the efficiency
c) changing the direction of force needed to accomplish a task
d) decreasing the mechanical advantage
If you do 2,000 J of work using a hammer. The hammer does 1,500 J of work on the nail. What is the efficiency of the hammer? (Efficiency = output work / input work x 100%)
a) 21%
b) 75%
c) 133%
d) 300%
The unit of work is called a
a) Newton
b) Joule
c) Joule-meter
d) Gram
An Ideal machine has an efficiency of
a) 0%
b) 75%
c) 50%
d) 100%
A machine's _____________________ is the number of times a force exerted on a machine is multiplied by the machine.
a) axle
b) ideal mechanical advantage
c) mechanical advantage
d) tendons
In a screwdriver, the handle is the wheel and the shaft is the _____________________
a) axle
b) tendon
c) mechanical advantage
d) distance
Muscles are attached to bones by ______________________
a) mechanical advantage
b) tendons
c) ideal mechanical advantage
d) axle
The more EFFICIENT a machine is, the closer the ACTUAL mechanical advantage is the _____________________
a) mechanical advantage
b) axle
c) ideal mechanical advantage
d) tendons
A machine DECREASES the amount of work you do
a) true
b) false
c)
d)
An inclined plane wrapped around a central cylinder is a LEVER
a) True
b) False
c)
d)
A rope wrapped around a grooved wheel is a PULLEY.
a) True
b) False
c)
d)
A single fixed pulley, such as a flagpole, changes the AMOUNT of the input force
a) True
b) False
c)
d)
When you bite into a sandwich, your front teeth act as WEDGES.
a) True
b) False
c)
d)
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