Misc
Fill in
Concepts
Critical Thinking
body machines
100
Multiplying _________ and __________ gives you the amount of work done on an object.
What is force and distance
100
If none of the forces of an object are in the direction of the objects ________, no work is being done.
What is motion?
100
Atlas holds the Earth. Is he working? What is needed for work?
No, What is motion?
100
It is easier to open a door (lever) by pushing on the farthest part from the hinges (fulcrum). Harder to open if you push the center of the door. Decreasing the distance between the effort force and the fulcrum leads to a decrease in the _____________.
What is mechanical advantage
100
muscles are attached to bones with these.
What are tendons?
200
This is how a machine can make work easier for you
What is changing the direction of your force or reducing the input (effort) force?
200
_________ reduces the efficiency of a machine in the real world.
What is friction?
200
You do 1,000 joules of work to operate a can opener. However the can opener does only 500 joules of work in opening the can . What is the efficiency of the can opener?
What is 50%?
200
This simple machine works well to get water from a well.
What is a pulley? (or wheel and axel)
200
This is the force produced by the muscle.
What is input force?
300
A nutcracker has a ________ (greater or lesser) output force than input force.
What is greater.
300
The comparison between output work and input work is ____________
What is efficiency?
300
The actual mechanical advantage of a machine is 3. If you exhert an input force of 5 N what output force is exherted by the machine?
What is 15N. (input force x actual mechanical advantage)
300
This increases causing less efficiency of a machine.
What is friction?
300
Muscles exhert a force on the bones to produce movement by doing this.
What is shortening or pulling. (Contracting)
400
A wheelbarrow is an example of a ___________ lever.
What is second class?
400
A _______ can be thought of as an inclined plane wrapped around a central cylinder
What is a screw?
400
When you fill your water bottle, this simple machine helps you open the cap.
What is a screw?
400
Sharpening a knife increases this by making the edge sharper and the wedge thinner.
What is mechanical advantage?
400
Your incisor teeth have the shape of this simple machine.
What is a wedge?
500
A bicycle is an example of a ________ machine.
What is compound?
500
An object that changes the amount of force or direction needed to do work.
What is a machine?
500
Length of the incline / height =___________
What is ideal mechanical advantage of a ramp?
500
The higher the % the _________(MORE or LESS) efficient a machine is.
What is higher.
500
The type of lever in your body depends upon the locations of these three things:
What is fulcrum, input force and output force?