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WorksheetsWork and Machines
Total questions: 10
Worksheet time: 6mins
For work to be done on an object,
some force need only to be exerted on the object
the object must move some distance as a result of a force
the object must move, whether or not a force is exerted on it
the object must not move
Which of these is an example of work being done on an object?
holding a heavy piece of wood at a construction site
trying to push a car that doesn't move out of deep snow
pushing a child on a swing
holding a door shut on a windy day so it doesn't blow open
If you exert a force of 20 newtons to push a desk 10 meters, how much work do you do on the desk?
200 joules
30 joules
10 joules
100 joules
Work is measured in
meters
pounds
joules
newtons
What do machines do?
change the amount of force you exert or the distance over which you exert the force
increase the amount of work that is done
decrease the amount of work that is done
eliminate friction
The mechanical advantage of a machine is the number of times a machine increases
the distance an object is moved
the amount of friction
the change in direction
the force exerted on the machine
Without friction there would be
less machine efficiency
greater output work than input work
greater input work than output work
equal input and output work
An ideal machine would have an efficiency of
1 percent
10 percent
50 percent
100 percent
A ramp is an example of a simple machine called a(n)
inclined plane
wedge
lever
pulley
The ideal mechanical advantage for an inclined plane is equal to the length of the incline divided by the
mass of the incline
slope of the machine
height of the incline
angle of the incline
