01' For work to be done on an object, the object must move some ___ as a result of the force'

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01. For work to be done on an object, the object
must move some ___ as a result of the force.
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DISTANCE
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02. The force exerted by a machine is called the
___force.
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OUTPUT
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03. In order to do work on an object, the force
you exert must be in the same ___ as the objects
motion.
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DIRECTION
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04. Work equals force ___ distance.
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TIMES
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05. If you exert a force of 50 newtons to push a
desk 5 meters, how much work do you do on the
desk?
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250 JOULES
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06. Work is measured in the units of ___.
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NEWTON-METERS OR JOULES
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07. Machines change the amount of ___ you exert
or the distance over which you exert the force.
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FORCE
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08. A term that means the same thing as output
force is ___ force.
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RESISTANCE
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09. A hockey stick can be considered a machine
because it multiplies ___.
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DISTANCE OR SPEED
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10. Pulling down on a rope to hoist a sail on a
sailboat is an example of a machine changing the
___ in which a force is exerted.
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DIRECTION
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11. If you exert a force of 10 newtons on a
screwdriver, and the screwdriver exerts a force
of 60 newtons on the screw, the ideal mechanical
advantage of the screwdriver is ___.
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6
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12. The mechanical advantage of a machine that
changes only the direction of force is ___.
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ONE (1)
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13. Without ___ there would be equal work input
and work output.
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FRICTION
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14. An ideal machine would have an efficiency of
___.
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100
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15. The ___ of a machine compares output work to
input work.
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EFFICIENCY
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16. If tight hedge clippers have an efficiency of
60 percent, how much of your work is wasted
overcoming friction?
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40
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17. A ramp is an example of a simple machine
called a(n) ___.
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INCLINED PLANE
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18. The ideal mechanical advantage for an
inclined plane is equal to the length of the
incline divided by the ___ of the incline.
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HEIGHT
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19. A wedge is a simple machine that might be
thought of as a(n) ___ that moves.
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INCLINED PLANE
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20. A screw would be considered an inclined plane
wrapped around a ___.
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CYLINDER OR CYLINDRICAL POST
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21. The fulcrum is the fixed point that a ___
pivots around.
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LEVER
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22. A baseball bat is an example of a ___-class
lever?
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THIRD (3RD)
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23. The ideal mechanical advantage of a wheel and
axle is equal to the radius of the wheel ___ the
radius of the axle.
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DIVIDED BY
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24. When you raise or lower a flag on a flagpole,
you are using a(n) ___.
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PULLEY
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25. A machine that uses two or more simple
machines is called a ___ machine.
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COMPOUND
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26. A system of ___ is a device with toothed
wheels that fit into one another.
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GEARS
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27. A bicycle is one example of a ___ machine.
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COMPOUND
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28. Most of the machines in your body consist of
bones and muscles and are called ___.
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LEVERS
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29. The joints are body parts that act as the ___
of levers.
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FULCRUMS
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30. Incisors are body parts that are shaped like
___.
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WEDGES
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31. When you drop a rock, the object that does
work on the rock as it falls is ___.
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THE EARTH
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32. A gardener pushes on the angled handle of a
lawn mower, causing it to move forward across a
lawn. The only portion of the gardeners force
that does work on the lawn mower is the force in
the ___ direction.
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HORIZONTAL FORCE
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33. A newton-meter is a measure of work also
known as the ___.
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JOULE
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34. The amount of work done in lifting a 25-N bag
of sugar 2 meters is the same as lifting two 25-N
bags of sugar ___ meter(s).
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1 (ONE)
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35. The force applied to a machine is called the
___force.
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INPUT
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36. A simple machine makes work easier by
multiplying force or ___, or by changing
direction.
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DISTANCE
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37. The ___ mechanical advantage of a machine
cannot be predicted in advance because it depends
on the efficiency of the machine.
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ACTUAL
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38. The ideal mechanical advantage would equal
the actual mechanical advantage if there were no
losses due to ___.
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FRICTION
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39. The efficiency of an actual machine is always
less than ___.
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100
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40. The output work of a certain machine is
12,600 J. If the input work is 18,000 J, the
efficiency is ___.
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70
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41. When you use a paint can opener to open a can
of paint, you use the paint can opener as a
simple machine called a(n) ___.
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LEVER
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42. A jar lid is an example of a simple machine
called a(n) ___.
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SCREW
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43. A screwdriver is a simple machine called a(n)
___.
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WHEEL AND AXLE
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44. A ramp in a parking garage is an example of a
simple machine called a(n) ___.
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INCLINED PLANE
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45. You can increase the ideal mechanical
advantage of a first-class lever by moving the
fulcrum closer to the ___ force.
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RESISTANCE
91
46. Raising one end of a ramp will ___ its ideal
mechanical advantage.
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DECREASE
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47. The set of gears on a bicycle wheel is
classified as a(n) ___machine.
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COMPOUND
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48. A chef sometimes holds the tip of a knife
stationary when chopping food. Held this way, the
knife is a compound machine made up of a wedge
and a ___.
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LEVER
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49. As you wave your hand at the wrist, your hand
is acting as a simple machine called a(n) ___.
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LEVER
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50. As you bite into a peach, your front teeth
act as a simple machine called a(n) ___.
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WEDGE