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Science Quiz 7A-7B
Terms in this set (21)
What is one of the best sources of good ideas for developing technologies such as simple machines?
to observe God's handiwork in nature
What is the SI unit for work? How do you determine the mechanical work done on a system?
Joules/ the product of the force acting on a system parallel to the system's displacement and the displacement of the system itself
State the SI unit for power and its equivalent in more basic SI units. What two factors determine the power applied to a system?
Watt and Joules per second/ the amount of work accomplished and the time in which it occurs
What are the three general categories of simple machines? Why are they called simple machines?
levers, wheels & axles, and inclined planes/ they are basic mechanical parts from which all other non-hydrolic machines and tools are made
What is always true in the real world about the value of the ratio W out/ W in? (sorry the computer wouldn't let me type the equation right -Katelyn Kiser)
it is always less than 1
How does a simple machine provide a mechanical advantage? What does a simple machine not do?
it reduces the effort/ it doesn't reduce the amount of work
How does the user "pay" for obtaining a mechanical advantage from a simple machine? What is this property of simple machines called?
they have to exert a smaller effort through a greater distance/ the distance principle
(True or False) A simple machine allows you to accomplish a task with less work than if you did the work without the machine.
Describe the two essential parts of an ideal lever system.
a bar and a fulcrum
What condition exists when a lever system is not accelerating around its pivot point?What two qualities must cancel for this condition to occur?
rotational equilibrium/ it can exist only if the torques on the two arms of a lever system cancel
Write the general formula for the law of torques and identify each variable.(again sorry, the computer wouldn't let me type the equation just right -Katelyn Kiser)
F1 x L1 = F2 x L2/ F1: effort force, L1: torque arm of the effort, F2: resistance force, L2: torque arm of the resistance
What are the potential values of IMA for a first-class lever? What is the relationship between the effort and the resistance arms in each case?
IMA is greater than 1, equal to 1, or less than 1/ when the IMA is greater than 1 the effort arm is greater than the resistance arm. When the IMA is equal to 1 the effort arm is equal to the resistance arm. When the IMA is less than 1 the effort arm is less than the resistance arm.
What are the potential values of IMA for a second-class lever? What is the relationship between the effort and resistance arms?
it only has an IMA greater than 1/ the effort arm is always longer than the resistance arm
What are the potential values of IMA for a third-class lever? What is the relationship between the effort and resistance arms?
it only has an IMA less than 1/ the effort arm is always shorter than the resistance arm
Classify: a hammer pulling nails
Classify: a baseball bat
Classify: a three-hole punch
Classify: a nutcracker
Classify: a leg bending at the knee
Classify: scissors cutting paper
(True or False) The law of torques applies to a lever system under all conditions.
THIS SET IS OFTEN IN FOLDERS WITH...
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