WorksheetsWork, Power, Simple Machines
Total questions: 42
Worksheet time: 1hrs 23mins
What are the six types of simple machines?
gear, lever, wheel, axle, pulley, ramp
lever, wheel and axle, inclined plane, wedge, screw, pulley
lever, inclined plane, wedge, spring, gear, pulley
lever, wheel, axle, inclined plane, block and screw.
Energy
the measure of temperature
the degree of gravity
the ability to do work
the process of photosynthesis
A combination of two or more simple machines working together is called
a simple machine
a compound machine
a wedge
a screw
What occurs when a machine's mechanical advantage is equal to 1?
It increases the force applied
It only changes the direction of the force.
it makes the machine more efficient.
It decreases the distance moved.
A machine that increases the distance that the work is done over is called
an inclined plane.
a wheel and axle.
a lever.
a pulley.
A word that describes how fast you are using the energy is called
power.
momentum.
screw.
frequency.
A modified first lever that uses a round disc with a rod through the center.
wheel and axle
block and tackle
screw
wedge
Simple machine
A device that makes electricity.
A type of storage system.
A machine that makes work easier.
A tool for measuring distance.
What occurs when the machines mechanical advantage is greater than 1?
It takes a longer amount of time to use the machine.
It increases the distance that you do the work.
It only changes the direction of the force.
It multiplies your force.
First class lever is
where the fulcrum is in the middle.
where the load is lifted directly by the force.
where the effort is applied oat one end.
where the lever is used to smash materials.
Measures the ratio of output force to input force or input distance to output distance.
mechanical advantage
efficiency
energy
power
What is a Watt equal to?
J/k
J/s
J/m
W/s
Two inclined planes back to back. It has one input force and 2 output forces.
Wedge
Ramp
Joule
Newton
Newton
A unit of mass.
A unit of temperature.
A unit of force.
A unit of distance.
What is a joule equal to?
N x s
kg x m/s2
J/s
N x m
Joule
Unit of potential energy.
A unit of work.
A unit of power.
A unit of energy.
What are the units of Power?
Hertz
Joules = Nxm
Newtons
Watts or J/s
What are the units for mechanical advantage?
Watts
Joules
Newtons
There are no units.
Why is walking up the stairs the same amount of work as running?
Different distances and different times.
Walking is slower than running so the time will be different.
Same distance and same force used, time does not matter.
Running uses less energy.
What are both formulas for mechanical advantage?
MA = F x d
MA = W/t
MA = Fout/Fin
MA = din/dout
MA = Nxm
MA = J/s
MA = J/s
MA = kgxm/s2
Screw
A type of lever that pivots on a point.
A rotating wheel with a groove.
An inclined plane wrapped around a pole.
A flat surface used to lift objects.
A rigid bar that rotates around a fixed point is called a
wedge
lever
screw
ramp
What are the units of work?
Watts or J/s
Newton
There are none
Joules or Nxm
A modified first class lever. Changes the direction of the force.
pulley
wedge
joule
screw
What are two ways machines can help with work being done?
First class has the fulcrum in the middle.
1. Increase the force
2. Increase the distance over which the work is being done.
1. Change the direction
2. increase the distance.
1. Increase the amount of time
2. Increase the amount of force.
Why is walking up the stairs less powerful than running?
It requires more energy.
It involves more distance covered.
It is less efficient.
It takes a longer amount of time.
Input force
Done by the machine.
Done with the help of 2 people.
Done by you.
Decreases the time.
What occurs when the machines mechanical advantage is less than 1?
It changes the direction of the force.
It requires less input force.
It decreases the amount of work being done.
It increases the distance that you do the work.
What is the formula for work?
W = P x v
W = F x v
W = F x d
W = m x a
When a force acts on an object to move it a distance from it's starting point that is called
velocity
work
screw
power
What is the main difference between a first class lever and the other two?
First class has the input force on one end.
First class has the fulcrum in the middle.
First class has the fulcrum at one end.
First class has the output force in the middle.
What are the 3 types of inclined planes?
ramp, screw, wedge
lever, wheel and axle, ramp.
First class lever, second class lever, third class lever.
pulley, ramp, screw
Output force
N x m
Done by the machine
Done by you
compound machine
This machine has the fulcrum at one end and the input force is in the middle.
First Class Lever
Second Class Lever
Third Class Lever
Ramp
How is a third class lever similar to a second class lever?
Both have the fulcrum at the end of the bar.
Both have the fulcrum in the middle of the bar.
Both have the input force in the middle of the bar.
Both can lift heavy objects.
How can you determine if work is being done on an object?
If the object does not move.
If the object is heavier than before.
If the object is being moved backwards.
If the object has moved.
The machine that has the fulcrum on one side and the output force in the middle.
First Class Lever
Second Class Lever
Third Class Lever
Pulley
How is a second class lever DIFFERENT than a third class lever?
Second class lever has the output force in the middle of the bar.
Second class lever has no output force.
Second class lever has the fulcrum in the middle of the bar.
Second class levers have the input force in the middle of the bar.
It makes work easier by decreasing the force needed to lift an object.
ramp
lever
pulley
screw
What is the formula for power?
F x d
energy x rate
W/d
W/t
Watts
Unit of Power
Unit of Work
Unit of force
Unit of mass
What category of simple machines does a pulley and wheel and axle fit into?
Levers
Modified levers
Modified inclined planes
inclined planes
