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WorksheetsHow machines make work easier
Total questions: 15
Worksheet time: 8mins
What is a machine?
A three-dimensional representation of a thing typically on a smaller scale than the original.
A preliminary model of something from which other forms are developed or copied.
Any device that makes doing something easier.
A simplified description of a system or process to assist calculations and predictions.
To use a machine, such as a crowbar, you must apply a(n) ___ to it.
output force
input work
input force
output work
A machine changes the input force into a(n) ___.
output distance
output force
input work
input distance
You apply an input force that moves part of the machine certain distance and do ___.
work
efficiency
power
mechanical advantage
Machines convert input work to output work by applying a(n) ___ on something and making it move a certain distance.
input time
output power
input power
output force
A machine can make work easier by changing:
The size of a force.
The distance the force acts.
The direction of a force.
All of the above.
A crowbar makes work easier by changing the input force into a ___ output force.
smaller
equal
uniform
larger
When the output force is greater than the input force, the output force acts over a ___ distance.
shorter
equivalent
greater
momentary
Using a rake to gather leaves is an example of a machine that ___ the distance over which a force acts.
maintains
perpetuates
increases
decreases
A ___ is an example of a machine that makes work easier by changing the direction of the input force.
hammer
pulley
rake
crowbar
Jill does 270 J of work pulling the rope on a pulley to lift a crate. The output work of the pulley is 235 J. What is the efficiency of the pulley?
.87 J
114%
87%
1.14 J
Jain applies an input force of 100 N to a lever that has a mechanical advantage of 3. What is the output force?
300 N
33.33 N
300
33.33
Morgan does 50 J of work with a lever that has an efficiency of 92%. What is the output work of the lever?
1.84
46 J
4600
184 J
What is the formula to obtain the Mechanical Advantage of a machine?
MA=FoFi
MA=Wo/Wi
MA=WoWi
MA=Fo/Fi
What is the formula to get Output work (Wo)?
Wo=EffWi
Wo=MAWi
Wo=Eff/Wi
Wo=MA/Wi
