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Worksheets14. 1-3 Mastery Quiz
Total questions: 80
Worksheet time: 1hrs 6mins
The distance the resistance end of a lever moves is called the _________.
Output Distance
Output Work
Output Force
The ratio of work output to work input is called
energy
efficiency
friction
mass
No machine can be 100% efficient because of
Thermal energy
Waste energy
Convection energy
Friction
The factor by which a simple machine makes doing work feel easier.
Input Force
Efficiency
Mechanical Advantage
You apply a force of 10 N on to the end of a lever to open a paint can lid. The
resistance of the lid is 20 N. Calculate the MA.
(a)
You apply a force on a crowbar to open a stuck door. The effort length of the
crowbar is 24 cm long and the resistance length is 6 cm. Find the MA of the crowbar.
(a)
A compound machine --
Doesn't exist
is a combination of two or more simple machines
is only one simple machine
is used to make work harder
The Mechanical Advantage (MA) of a simple machine makes work
Easier
Harder
No difference to the work done
None Of the above
The force exerted on the machine is the ______ _______, and the force the machine exerts on an object is called the _______ _______.
output force, input force
input force, output force
greater force, lesser force
The input force multiplied by the input distance equals the
input work.
output work.
work.
power.
The output force multiplied by the output distance equals the
input work.
work.
output work.
power.
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
A machine can increase the __________ exerted, the ________ moved, or change an object's ____________.
force, distance, direction.
force, distance, area.
force, distance, power.
What is mechanical advantage?
the number of times a machine increases distance an object moves
the number of times a machine increases a force exerted on it
the number of times a machine increases the power of itself
The _________ of a machine compares the output work to the input work.
efficiency
force
work
shininess
The work done by a machine is always less than the work done on a machine because of (a) .
50000 N
Finding the ratio of input force to output force of a machine calculates the
mechanical advantage.
advantage.
force advantage.
power advantage.
Machines make work easier by doing what?
Changing the size of a force needed
Changing the direction of a force
changing the distance over which a force acts
all of the above
The IMA of a simple machine is 2.5. If the output distance is 1.0M, What is the input distance?
(Show your work)
The force exerted by a machine is called the (a) force.
True or False? Every machine uses some of its work input to overcome friction.
True
False
___ of a machine is the mechanical advantage in the absence of friction?
Mechanical advantage
Actual mechanical advantage
Ideal Mechanical Advantage
Efficiency
A woman drives her car onto wheel ramps to perform repairs. If she drives a distance of 1.8m along the ramp to raise the car 0.3m, what is the IMA of the wheel ramps?
54
3
6
2.1
A 120-M long ski lift carries skiers from a station at the foot of a slope to a second station 40 m above. What is the IMA of the lift? (Show your work)
The force exerted on the machine is the ______ _______, and the force the machine exerts on an object is called the _______ _______.
output force, input force
input force, output force
greater force, lesser force
The input force multiplied by the input distance equals the
input work.
output work.
work.
power.
The output force multiplied by the output distance equals the
input work.
work.
output work.
power.
A machine can increase the __________ exerted, the ________ moved, or change an object's ____________.
force, distance, direction.
force, distance, area.
force, distance, power.
The _________ of a machine compares the output work to the input work.
efficiency
force
work
shininess
The work done by a machine is always less than the work done on a machine because of (a) .
friction
inertia
gravity
static
Machines make work easier by doing what?
Changing the size of a force needed
Changing the direction of a force
changing the distance over which a force acts
all of the above
If a machine increases the distance over which a force is exerted, the force required to do a given amount of work (a) .
Select 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
True or False? Every machine uses some of its work input to overcome friction.
True
False
The force exerted by a machine is called the (a) force.
True or False? Output work is always less than input work.
True
False
What is (input) force?
the force one exerts on a machine
the force which an effort force must overcome in order to do work on an object via a simple machine.
the force the machine exerts on a object
the output work times the input distance
What is (output) force?
the force required by a machine in order to accomplish work (the force you put on the machine)
The force that is exerted by a machine
the force the machine exerts on a object
the output work times the input distance
What is (input) distance?
the force required by a machine in order to accomplish work (the force you put on the machine)
the force which an effort force must overcome in order to do work on an object via a simple machine.
the distance an input force acts through
the output work times the input distance
What is (output) distance?
the force required by a machine in order to accomplish work (the force you put on the machine)
the force which an effort force must overcome in order to do work on an object via a simple machine.
the distance an input force moves a machine
the distance through which the output force is exerted
Name the 6 simple machines
What is the output distance of a machine that require 2 newtons of force exerted over 6 meters and whose output force is 4 newtons?
2 meters
3 meters
6 meters
12 meters
This picture shows an example of what type simple machine?
pulley
wedge
lever
wheel and axle
How many classes of levers are there?
3
4
5
6
Which is the correct equation to calculate distance if you know the Work and Force?
d = W * F
d = F / W
d = W / F
d = W / F * d
What is the correct equation to calculate Work if you know time and Power?
W = P * t
W = P / t
W = t / P
W = W / P * t
If a 5 N force is acting straight upward on an object that is moving 10 m straight east, the amount of work done by that force acting on the object is
50 J
15 J
2 J
0 J
No machine can be 100% efficient because of
Thermal energy
Waste energy
Convection energy
Friction
Which is not considered a simple machine?
The pump
The wheel & axle
The wedge
The screw
The pulley
What do you call multiple pulleys working together?
multi-pulley
Block-and-Tackle
Mechanical Advantage
The amount the resistance end of a lever moves is called the _________.
Output Distance
Output Work
Output Force
The factor by which a simple machine makes doing work feel easier.
Input Force
Efficiency
Mechanical Advantage
Is carrying a box across the room doing "work?"
Yes
No
What type of simple machine is this?
1st class lever
2nd class lever
Block-and-Tackle
What type of simple machine is this?
2nd class lever
3rd class lever
Peter Damon
How do you find the Ideal Mechanical Advantage of a LEVER.
Divide the Input Length by the Output Length
Multiple the Input Length by the Efficiency
Divide the Output Length by the Input Length
What type of machine is this?
1st Class Lever
2nd Class Lever
3rd Class Lever
The watt and the horsepower are both units of (a) .
Where should the fulcrum be placed in order for the student to use the least amount of effort possible:
further away from the load
closer to the load
in the center between the effort and load
it doesn't matter
If you use a crowbar to get a lid off a bucket, which simple machine are your using?
inclined plane
wheel and axle
pulley
lever
How could you Increase the Mechanical Advantage of a lever?
Move the fulcrum closer to the load
Move the fulcrum closer to the force
Remove the fulcrum
Exert more force
A machine with a 5-N input force and a 25-N output force has a mechanical advantage of?
2
5
20
125
You apply a force of 18 N on to the end of a lever to open a paint can lid. The
resistance of the lid is 9 N. Calculate the MA.
(a)
