Shared Flashcard Set

Details

Machines
simple machines
17
Science
8th Grade
03/09/2010

Additional Science Flashcards

 


 

Cards

Term
Work
Definition
Any time you exert a force on an object and it moves some distance.
Term
In order  to do work on an object, the force that you exert must be in the same direction as the object's ________.
Definition
motion
Term
The work you do on an object depends on the ______ you exert on an object and the ________ it moves.
Definition
  • force
  • distance
Term
What is the equation for work?
Definition
work= force x distance
Term
Work is measured in what units?
Definition
Newtons x meter (N m) or Joules (J)
Term
What is the equation for power?
Definition
power = work or energy transferred/time
Term
What are the units for power?
Definition
Watts (W)
Term
Machines work by changing the ____ or _________, or both of the _____ ______.
Definition
  • size
  • direction
  • force applied
Term
When you use a ramp to elevate an  object, you ________ the distance the object travels. This lowers the amount of force you have to exert to accomplish the same amount of work.
Definition
increase
Term
Some machines take a larger force and make it ______.
Definition
smaller
Term
What is the Mechanical Advantage equation?
Definition
output FORCE/input FORCE=m.a.
Term
What is the equation for efficiency?
Definition
output WORK/input WORK
Term
What is the M.A. equation for an inclined plane?
Definition
length/height
Term
What is the M.A. equation for a wedge?
Definition
length/width
Term
What is the M.A. equation for a wheel and axle?
Definition
radius of wheel/radius of axle
Term
What's the M.A. equation for a pulley?
Definition
count the sections of rope, then subtract one for the section you pull down
Term
What's the equation for kinetic energy?
Definition
1/2 (mass)(velocity2)
Supporting users have an ad free experience!