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WorksheetsSimple Machines and Work
Total questions: 73
Worksheet time: 1hrs 8mins
Work is done when you push a book across a table.
True
False
Doing work faster requires more power.
True
False
Machines always decrease the force needed to do a job.
True
False
A well-oiled, low-friction machine can be 100 percent efficient.
True
False
A doorknob is a simple machine.
True
False
A loading ramp makes it easier to lift a load.
True
False
How are force and motion related to doing work?
Force and motion are unrelated to work.
Work is done when force causes motion.
Motion occurs without any force involved.
Force is applied but no work is done.
Work is a ____________________ of energy.
transfer
source
form
type
____________________ is the transfer of energy to an object by a force that makes an object move in the direction of the force.
work
heat
power
momentum
What is work? _______ is the transfer of energy to an object by a force that makes an object move in the direction of the force.
Work
Power
Energy
Force
A weightlifter does work when exerting a force that makes weights _______, but does no work to hold weights in place because the weights are not _______.
Move, moving
Stationary, stationary
Lift, lifting
Hold, holding
You must know two things to calculate work—_______ and _______.
Force and distance
Mass and velocity
Time and speed
Energy and power
The force must be in _______.
Newtons
Joules
Watts
Amperes
The distance must be in _______.
Meters
Kilometers
Feet
Inches
A newton-meter is also called a(n) _______, which is the unit of work.
Joule
Watt
Newton
Pascal
The work equation uses the distance that the _______ acts on the object, not necessarily the total _______ that the object moves.
Force
distance
mass
velocity
acceleration
The work done on an object depends on the _______ of the force applied and the direction of the motion.
Magnitude
Color
Temperature
Speed
When the force on an object and the motion of the object are in the same direction, you multiply the total _______ times the total distance to determine the amount of work done.
Force
Speed
Time
Mass
When the force on an object is at a(n) _______ to the direction of motion of the object, you multiply only the part of the force that is in the _______ of motion times the total distance to determine the amount of work done.
Angle, direction
Parallel, opposite
Perpendicular, same
Opposite, angle
The weight of any object is due to the downward force of _______ on the object.
Gravity
Friction
Magnetism
Electricity
To lift an object, you must pull upward on the object with a force _______ to the object's weight.
Equal
Greater than
Less than
Twice as much
The work done to lift any object is equal to the _______ of the object multiplied by the distance the object is lifted.
Weight
Volume
Density
Temperature
Doing work on an object increases transfers __________ to the object.
energy
mass
volume
temperature
Because doing work on an object requires that the object move, doing work on the object increases its __________ energy.
kinetic
potential
thermal
chemical
Lifting an object increases the object's gravitational __________ energy.
potential
kinetic
thermal
chemical
__________ is the rate at which work is done.
Power
Energy
Force
Velocity
Power is determined by dividing the work done by the amount of __________ needed to do the work.
time
force
distance
energy
In the power equation, __________ done is in joules.
work
force
energy
power
In the power equation, __________ is in seconds.
time
voltage
current
resistance
In the power equation, power is in __________.
watts
joules
newtons
amperes
Key Concept: What caused the change in work done for each surface?
Friction differences
Surface area changes
Material properties
Temperature variations
In science, ______________ is done when a force produces ______________ in an object. Use the terms from the word bank.
work
heat
light
sound
A newton-meter is the same thing as a(n) ______________. Use the terms from the word bank.
joule
watt
pascal
newton
The work done in lifting an object is equal to the ______________ of the object times the ______________ it is lifted. Use the terms from the word bank.
weight and distance
mass and speed
force and acceleration
energy and time
We know that 1 J/s is equal to 1 ______________.
watt
joule
newton
volt
In science, when is work done?
When a force is applied and there is movement in the direction of the force
When a force is applied but there is no movement
When there is movement without any force applied
When an object is at rest
What is the equation for determining the amount of work that has been done on an object?
Work = Force x Distance
Work = Mass x Acceleration
Work = Velocity x Time
Work = Power x Time
The SI unit of work and energy is equal to which of the following?
Joule
Watt
Newton
Pascal
How does moving an object at an angle affect work?
It increases the work done.
It decreases the work done.
It has no effect on the work done.
It depends on the angle of movement.
The force required to lift an object is equal to?
The mass of the object
The weight of the object
The volume of the object
The density of the object
What is the equation for power?
Power = Work / Time
Power = Force x Distance
Power = Mass x Acceleration
Power = Energy x Time
Which of the following is a simple machine?
Lever
Battery
Motor
Generator
A weightlifter lifts two 300 newton weights 1.5 meters off the ground in 5 seconds. How much work has he done?
180 J
180 W
900 J
900 W
A 2.0 N Force is applied to a 0.5 kg crate to move it to the right 4 m at a constant speed as seen in the diagram. What is the amount of work done by the force?
4 J
1 J
2 J
7 J
d=50 m
w=??
A force is applied by a chain to a roller coaster car to carry it up the hill of the first drop of the Shockwave ride.
This is an example of work being done.
True
False
If a force of 10 N is applied to an object and it moves a distance of 5 meters, what is the work done? Use significant figures and units.
(a)
Why is an inclined plane a good solution for a lifting task ?
The force required will be more than the force required to lift the object directly
The force required will be less than the force required to lift the object directly
The force required will be less than the force required to lift the object indirectly
For a lever to move, do forces have to be balanced or unbalanced
balanced
unbalanced
a machine made of more than one simple machine
Compound machines
Power
Simple machine
Potential energy
What is a pulley?
long bar that increases the applied force when you pivot it around a fulcrum
a wheel with teeth
Two or more wheels with ropes around them
like a ramp wrapped around in a circle
A first class lever has the....
fulcrum at one end and the output force between the fulcrum and input force
fulcrum at one end and the input force between the fulcrum and the output force
fulcrum in the middle
input force in the middle
What is a wheel and axle?
long bar that increases the applied force when you pivot it around a fulcrum
a wheel turning around a rod
Two or more wheels with ropes around them
inclined plane
It changes the direction of the input force.
It changes the distance over which the input force is applied.
It changes the amount of the input force applied
It changes direction and increases the effect of your input force
