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WorksheetsWork, Power & Machines (Terms of Reference)
Total questions: 39
Worksheet time: 34mins
The product of distance and the force in the direction an object moves.
The Result of Force x Distance
Work
Power
Force
Efficiency
The SI Unit for Speed
m/s
m/s2
kg*m/s
kg/min2
The SI Unit for Force
Watt (w)
Newton (N)
Joule (j)
joules per gram per degree Celsius (J/g•0C)
The SI Unit for Power
Watt (w)
Newton (N)
Joule (j)
joules per gram per degree Celsius (J/g•0C)
The SI Unit for Momentum
Watt (w)
Newton (N)
kilogram per meters per second (kg ⋅ m/s)
joules per gram per degree Celsius (J/g•0C)
The rate at which work is done (measured in watts)
The product of = Work / Time
or
the product of (Force) x (Distance) / Time
Energy
Velocity
Force
Power
Work is the prouct of
speed and force
force and distance
power and force
motion and force
How much work is done when a 10-N force moves an object 2.5 m?
0.25 N⋅·m
2.5m
25 N⋅m
4.0 N·m
Power is equal to work divided by
time
force
distance
mechanical advantage
A common unit of power, equal to about 746 watts
kinetic power
horsepower (hp)
potential power
thermal power
A device that does work
pulley
fulcrum
machine
incline plane
The distance the input force acts through
input distance
output distance
input force
output force
In science, work is done when a(n) ______ acts on an object in the direction the object moves.
Mass
Watt
Joule
Force
Work is maximized when force is applied in ______ direction that the object is moving.
the opposite
the same
a 90 degree
a 45 degree
True or False?
A vertical force does work on an object that is moving in a horizontal direction.
True
False
Select the correct work equation to use when determining the distance an object moves as a result of a force applied to it.
Distance = Force x Work
Distance = Force / Work
Distance = Force2
Distance = Work / Force
True or false? Power is the rate of doing work.
True
False
Select the expression that is equivalent to one watt.
one newton per meter
one joule per meter
one newton per second
one joule per second
How much work does a 100-watt light bulb do when it is lit for 30 seconds?
3000J
33.3J
0.03J
300N
True or False?
A machine can make work easier to do by changing the size of the force needed, the direction of a force, or the distance over which a force acts
True
False
The work done by a machine is always less than the work done on a machine because of
Heat
terminal velocity
distance & displacement
friction
Select the option of the definition for input force.
the amount of force exerted by a machine
the amount of friction slowing the speed of a machine
the amount of work done by a machine
the amount of force exerted on a machine
The force exerted by a machine is called the _________ force.
output
input
True or False?
Every machine uses some of its work input to overcome friction.
True
False
True or False?
Output is generally less than input work..
True
False
The mechanical advantage of a machine if there were no friction
Mechanical Advantage
Actual Mechanical Advantage
Ideal Mechanical Advantage
Efficiency
The Ratio of output force to input force
Mechanical Advantage
Actual Mechanical Advantage
Ideal Mechanical Advantage
Efficiency
Percentage of work input that become work output
Mechanical Advantage
Actual Mechanical Advantage
Ideal Mechanical Advantage
Efficiency
The number of times a machine increases force
Mechanical Advantage
Actual Mechanical Advantage
Ideal Mechanical Advantage
Efficiency
True or False?
A loading ramp with a rough surface has a greater mechanical advantage than one with a smooth surface.
True
False
Because friction is always present, the actual mechanical
advantage of a machine is never _________ than its ideal mechanical advantage (IMA).
lesser
greater
equal
A machine’s _____________ is the mechanical advantage in the absence of friction.
Mechanical Advantage
Ideal Mechanical Advantage
Actual Mechanical Advantage
Efficiency
True or False?
To calculate the efficiency of a machine, divide the work output (the smaller force) by work input (the larger force), and then multiply by 100.
True
False
What is a significant factor affecting a mom's mini-van fuel efficiency?
Newton's 3rd Law
terminal velocity
air resistance
fusion and fission
Reducing friction __________ the efficiency of a machine
decreases
increases
does not change
the work done by the input force acting through the input distance
work input
work output
input force
output force
the work done by the machine
work input
work output
input force
output force
Ratio of the output force exerted by a machine to the input force applied to the machine.
Ideal Mechanical Advantage (IMA)
Actual Mechanical Advantage (AMA)
Mechanical Advantage (MA)
Efficiency
Ratio of the output force exerted by a machine to the input force applied to the machine.
Ideal Mechanical Advantage (IMA)
Actual Mechanical Advantage (AMA)
Mechanical Advantage (MA)
Efficiency
